Transducer Assembly

Abstract

The present invention provides a vehicle transducer assembly that reduces the reaction force transmitted to the interior trim of a vehicle and thereby reduces its vibration. [Solution] The transducer assembly 200 comprises two active acoustic radiators 204, 206 facing each other and driven by signals having the same electrical polarity. The voice coils 282, 284 of the two active acoustic radiators move toward and away from each other when the two active acoustic radiators are driven. The two active acoustic radiators include an inverted topology in which the motor assemblies 216, 218 are positioned in front of the movable diaphragms 208, 210 of the two active acoustic radiators, opposite the rear suspensions 212, 214. This provides a total piston area equivalent to that of a conventional acoustic radiator, and structural members 238 mechanically connect the motor assemblies in opposite directions to improve force cancellation characteristics.

Description

Technical Field

[0001] In some aspects, the present disclosure relates to a transducer that includes a dual opposed or force cancellation transducer assembly for a loudspeaker.

Background Art

[0002] Conventional loudspeakers generate a reaction force proportional to the moving mass and acceleration and reverse the direction of movement of the cone of the conventional loudspeaker. In a conventional loudspeaker mechanically coupled to a large structure, the reaction force is absorbed by the large structure, but as the mass of the structure decreases, the mass capable of attenuating the reaction force also decreases, resulting in unwanted vibrations.

[0003] There are Patent Documents 1 to 3 as documents related to the technical field.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

[0005] Modern vehicles continue to employ lighter components to increase speed and / or fuel efficiency, as well as reduce manufacturing costs. For example, vehicle interior trim (e.g., door trim, dashboard trim, etc.) can be made from relatively light materials such as polymers (e.g., plastics, polyvinyl chloride, acrylonitrile butadiene styrene, polycarbonate, etc.) and / or other materials. Loudspeakers can be installed within the vehicle's interior trim by linking them to the trim. However, the mass of the interior trim capable of absorbing the reaction force generated by the loudspeaker may be limited due to the lightweight material of the trim. When the mass capable of damping vibrations decreases, the interior trim may vibrate, rattle, or shake, leading to problems such as buzz, squeaking, and rattle, commonly referred to as BSR problems. Attempts to counteract reaction forces and mitigate BSR problems have been made by employing dual-opposed loudspeakers (see, for example, Patent Document 1), but such measures result in inefficient use of space and a reduced radiating area, which in turn requires a longer displacement of the loudspeakers to move the same volume of air as conventional speakers.

[0006] The transducer assembly described herein can address one or more of the above problems. The transducer assembly may comprise two active acoustic radiators that can be driven by signals having the same electrical polarity. The two active acoustic radiators, by facing each other (e.g., opposite each other), move such that when the two acoustic radiators are driven, the moving assemblies (e.g., voice coils, diaphragms) move closer to or further apart from each other, generating substantially equal and opposing reaction forces around the axis. This can reduce the vibration energy transmitted from the two active acoustic radiators to the mounting substrate (e.g., the interior trim of the vehicle), thereby reducing and / or eliminating the BSR problem. The opposing arrangement of the two active acoustic radiators can consequently cancel out or reduce forces perpendicular to the mounting surface of the transducer assembly, thereby reducing the vibration energy transmitted to the mounting substrate (e.g., reducing vibrations directly transmitted from the frame of the transducer assembly to the mounting substrate). The reduction and / or elimination of the BSR problem can improve listening comfort in the indoor environment.

[0007] While the arrangement of opposing transducers for vibration cancellation has been known in the prior art, the use of available space during their implementation has been inefficient until now. This disclosure inverts the topology of two active acoustic radiators, making more efficient use of space compared to the conventional topology (for example, reducing the overall internal depth required for each active acoustic radiator). For example, inverting the topology of two active acoustic radiators allows for a larger cone area compared to the conventional topology, and the amount of air swept by the two active acoustic radiators can be equal to that of a conventional active acoustic radiator with the same linear piston movement. The total piston area of ​​the two active acoustic radiators can be the same as that of the conventional active acoustic radiator being replaced. The inverted topology of the active acoustic radiators allows the transducer assembly to operate with lower strain compared to the conventional topology. The inverted topology of the active acoustic radiators allows the transducer assembly to displace more air compared to the conventional active acoustic radiator topology, and overall material costs can be reduced. The motor assemblies of the two active acoustic radiators (e.g., fixed or permanent magnets, components that conduct magnetic flux to the air gap, voice coils, and / or former elements) can be positioned in front of the corresponding diaphragms (e.g., within the voids of a conical diaphragm) to efficiently utilize space, thereby potentially reducing the axial height of the two active acoustic radiators. If the radiators are configured to displace air within a slot or duct, positioning the motor assembly in the center of the slot of the transducer assembly (e.g., the motor assembly is located between the diaphragms of the two active acoustic radiators) allows for a larger slot opening, thereby potentially improving airflow through the slot and reducing unwanted resonance effects. The motor assembly can be positioned in front of the diaphragm, opposite to the rear suspension elements (e.g., spiders).

[0008] By centralizing the motor assembly, the motor assembly and / or its support structure can be mechanically connected together, thereby potentially improving force cancellation characteristics. In some modifications, the motor assemblies can be physically connected together. For example, a structural member can be positioned between two active acoustic radiators to connect them together. The structural member can be directly connected to the frame of the transducer assembly and / or to the mounting substrate. By transmitting reaction forces in opposite directions along a common or parallel axis from the active acoustic radiators to a common structural member, which may be part of the frame of the transducer assembly, reaction force cancellation or reduction between the motor assemblies becomes more effective, thereby potentially reducing the transmission of forces to the mounting substrate (e.g., the interior trim of the vehicle), reducing strain caused by bending of the frame of the transducer assembly, or both. In some modifications, the axes of the two active acoustic radiators (e.g., the axes of the voice coils of the two active acoustic radiators) can be located coaxially, parallel to each other, and / or inclined to each other. In several other variations, multiple sets of acoustic radiators positioned in this manner may be used to obtain additional diaphragm area without increasing the physical depth of the assembly.

[0009] Various transducer assemblies are disclosed herein. A transducer assembly that may be for a vehicle may include a frame that can be incorporated into the interior trim of the vehicle. The transducer assembly may include a first active acoustic radiator located within the frame. The first active acoustic radiator may include a first movable diaphragm, a first rear suspension, and / or a first motor assembly. The first motor assembly may include a first magnetic circuit and a first voice coil. The first motor assembly may be located in front of the first movable diaphragm. The first rear suspension may be located opposite the first movable diaphragm. The transducer assembly may include a second active acoustic radiator located within the frame. The second active acoustic radiator may include a second movable diaphragm, a second rear suspension, and / or a second motor assembly. The second motor assembly may include a second magnetic circuit and a second voice coil. The second motor assembly may be located in front of the second movable diaphragm. A second rear suspension may be located on the opposite rear side of the second movable diaphragm. The transducer assembly may include a structural member located between the first active acoustic radiator and the second active acoustic radiator. The structural member may receive a first motor assembly and a second motor assembly. The first motor assembly and the second motor assembly may be located between the first movable diaphragm and the second movable diaphragm. The first voice coil and the second voice coil may be configured to move toward and away from each other when the first active acoustic radiator and the second active acoustic radiator are driven by signals having the same electrical polarity, so that the combined reaction force is reduced around the axis.

[0010] In some variations, the transducer assembly may further comprise a front structural member connected to and extending between a first active acoustic radiator and a second active acoustic radiator.

[0011] In some variations, the structural member can connect the first motor assembly and the second motor assembly.

[0012] In some variations, the first motor assembly and the second motor assembly may be located coaxially.

[0013] In some modifications, the first movable diaphragm and the second movable diaphragm may each have a conical shape. The first motor assembly may be at least partially located within the conical void of the first movable diaphragm. The second motor assembly may be at least partially located within the conical void of the second movable diaphragm.

[0014] In some variations, the frame may have a sealed air volume.

[0015] In some modifications, structural members can be connected to the vehicle wall.

[0016] The transducer assembly may include a frame. The frame may have an internal fluid volume or plenum. The transducer assembly may include a first active acoustic radiator located within the internal fluid volume or plenum. The first active acoustic radiator may include a first movable diaphragm, a first rear suspension, and / or a first motor assembly. The first motor assembly may include a first magnetic circuit and a first voice coil. The first rear suspension and the first motor assembly may be located on either side of the first movable diaphragm. The transducer assembly may include a second active acoustic radiator. The second active acoustic radiator may be located within the internal fluid volume or plenum. The second active acoustic radiator may include a second movable diaphragm, a second rear suspension, and / or a second motor assembly. The second motor assembly may include a second magnetic circuit and a second voice coil. The second rear suspension and the second motor assembly may be located on either side of the second movable diaphragm. The first voice coil and the second voice coil can move toward and away from each other while the first active acoustic radiator and the second active acoustic radiator are driven by signals having the same electrical polarity.

[0017] In some variations, the transducer assembly may include a structural member positioned between a first active acoustic radiator and a second active acoustic radiator. The structural member may receive a first motor assembly and a second motor assembly.

[0018] In some variations, the transducer assembly may comprise a first structural member and a second structural member. The first and second structural members are positioned between a first active acoustic radiator and a second active acoustic radiator. The first structural member may receive a first motor assembly. The second structural member may receive a second motor assembly.

[0019] In some variations, the first central axis of the first motor assembly and the second central axis of the second motor assembly may be located coaxially.

[0020] In some variations, the first central axis of the first motor assembly and the second central axis of the second motor assembly may be parallel.

[0021] In some variations, the first central axis of the first motor assembly and the second central axis of the second motor assembly may be inclined relative to each other.

[0022] In some modifications, the first movable diaphragm and the second movable diaphragm may each have a conical shape. The first motor assembly may be at least partially located within the conical void of the first movable diaphragm. The second motor assembly may be at least partially located within the conical void of the second movable diaphragm.

[0023] The transducer assembly may include a frame. The transducer assembly may include a motor assembly having a magnetic circuit assembly. The magnetic circuit assembly may include a first portion having a first voice coil and a second portion having a second voice coil. The transducer assembly may include a first active acoustic radiator supported by the frame. The first active acoustic radiator may include a first movable diaphragm. At least a portion of the first portion of the magnetic circuit assembly may be disposed in front of the first movable diaphragm. The transducer assembly may include a second active acoustic radiator supported by the frame. The second active acoustic radiator may include a second movable diaphragm. At least a portion of the second portion of the magnetic circuit assembly may be disposed in front of the second movable diaphragm. The first voice coil and the second voice coil may move closer to and away from each other while the first active acoustic radiator and the second active acoustic radiator are driven by signals having the same electrical polarity.

[0024] In some variations, the first movable diaphragm and the second movable diaphragm may each have a cone shape. The first portion of the magnetic circuit assembly may be at least partially disposed within the conical void of the first movable diaphragm. The second portion of the magnetic circuit assembly may be at least partially disposed within the conical void of the second movable diaphragm.

[0025] In some variations, the transducer assembly may include a structural member disposed between the first active acoustic radiator and the second active acoustic radiator. The structural member may receive the first portion and / or the second portion of the magnetic circuit assembly.

[0026] In some variations, the transducer assembly may include a first structural member and a second structural member. The first structural member and the second structural member may be disposed between the first active acoustic radiator and the second active acoustic radiator. The first structural member may receive a first portion of the magnetic circuit assembly. The second structural member may receive a second portion of the magnetic circuit assembly.

[0027] In some variations, the magnetic circuit assembly may be disposed within the plenum space of the transducer assembly.

[0028] In some variations, the first voice coil and the second voice coil may be coaxially positioned.

[0029] The transducer assembly may include a frame. The frame may have an internal fluid volume or a plenum. The transducer assembly may include a motor assembly. The motor assembly may include a first magnet, a first upper plate, a second magnet, a second upper plate, and / or a yoke that forms two magnetic gaps. The transducer assembly may include a first active acoustic radiator disposed within the internal fluid volume or plenum. The first active acoustic radiator may include a first movable diaphragm, a first rear suspension, and / or a first voice coil. The first rear suspension and the first voice coil may be disposed on both sides of the first movable diaphragm. The transducer assembly may include a second active acoustic radiator disposed within the internal fluid volume or plenum. The second active acoustic radiator may include a second movable diaphragm, a second rear suspension, and / or a second voice coil. The second rear suspension and the second voice coil may be disposed on both sides of the second movable diaphragm. The first voice coil may be disposed within the first gap of the two magnetic gaps. The second voice coil may be disposed within the second gap of the two magnetic gaps. The first voice coil and the second voice coil may move so as to approach each other and separate from each other while the first active acoustic radiator and the second active acoustic radiator are being driven by signals having the same electrical polarity.

[0030] In some variations, the transducer assembly may include a structural member positioned between a first active acoustic radiator and a second active acoustic radiator. The structural member may receive the motor assembly.

[0031] In some variations, the first central axis of the first voice coil and the second central axis of the second voice coil may be located coaxially.

[0032] In some variations, the first central axis of the first voice coil and the second central axis of the second voice coil may be parallel.

[0033] In some variations, the first central axis of the first voice coil and the second central axis of the second voice coil may be inclined relative to each other.

[0034] In some modifications, the first movable diaphragm and the second movable diaphragm may each have a conical shape. The motor assembly may be at least partially positioned within the conical voids of the first and second movable diaphragms.

[0035] In some variations, the magnetic field directions in the two magnetic gaps may be the same.

[0036] In some variations, the magnetic field directions in the two magnetic gaps may be opposite. When the magnetic field directions in the magnetic gaps are opposite, the first voice coil and the second voice coil may move toward and away from each other, while the first active acoustic radiator and the second active acoustic radiator are driven by signals having opposite electrical polarities.

[0037] In some variations, the first active acoustic radiator and the second active acoustic radiator may each include magnetic circuit components. One or more of the magnetic circuit components may comprise multiple parts. [Brief explanation of the drawing]

[0038] These drawings are illustrative embodiments and do not show all possible embodiments of the Disclosure. The illustrated embodiments are for the purpose of illustrating the scope of protection, but are not limited thereto. Further embodiments can be formed by combining various features of different embodiments disclosed, and such embodiments are part of the Disclosure. Certain elements may be omitted from these images for clarity or because they are not necessary to illustrate the functional parts of the embodiments.

[0039] [Figure 1] A schematic diagram of a dual opposing inverting transducer assembly inscribed in an oval is shown, viewed from the front. [Figure 2A] A schematic diagram of a dual opposing inverting transducer assembly is shown, with arrows indicating the motor assembly components that drive toward each other and the direction of air movement. [Figure 2B] A schematic diagram of a dual opposing inverting transducer assembly is shown, with arrows indicating the motor assembly components that drive to separate from each other, and the direction of air movement. [Figure 3A] This shows the effective piston area of ​​the active acoustic radiator in the dual opposed inverting transducer assembly. [Figure 3B] This shows the effective piston area of ​​a conventional active acoustic radiator. [Figure 4A] A front perspective view of a dual opposing inverting transducer assembly is shown. [Figure 4B] Figure 4A shows a rear perspective view of the dual opposing inverting transducer assembly. [Figure 4C] Figure 4A shows a rear cross-sectional view of the dual opposing inverting transducer assembly. [Figure 4D] Figure 4A shows a side cross-sectional view of the dual opposing inverting transducer assembly. [Figure 4E] Figure 4A shows a front cross-sectional perspective view of the dual opposing inverting transducer assembly. [Figure 4F] Figure 4A shows a rear cross-sectional perspective view of the dual opposing inverting transducer assembly. [Modes for carrying out the invention]

[0040] Figure 1 shows a transducer assembly 100, which may also be referred to as a dual-opposed inverted transducer. The transducer assembly 100 can be installed in a variety of locations, which may include at least the interior trim 128 of a vehicle (e.g., a mounting board) (e.g., door trim, dashboard trim, etc.). The vehicle may be at least an automobile (e.g., a car, truck, RV, van, motorcycle, bus, etc.), an aircraft (e.g., an airplane, helicopter, etc.), a vessel (e.g., a boat, motorboat, yacht, ship, jet ski, etc.), a train, or machinery (e.g., equipment, construction equipment). Alternatively, the transducer assembly may be installed in the wall, floor, or ceiling of a dwelling, in a bracket designed to receive the transducer assembly, or in an open or closed pressure vessel enclosure configured to receive the transducer assembly. The enclosure may include other forms of acoustic loading (e.g., bass reflex, passive radiator, transmission line, acoustic waveguide, acoustic horn, etc.). The transducer assembly 100 may include features that reduce BSR problems, make efficient use of space, or both, for improved performance. Conventional transducer assemblies with acoustic radiators can be replaced with the transducer assembly 100, and such replacement may include replacing conventional transducer assemblies that are mounted to the interior trim 128 of a vehicle.

[0041] The transducer assembly 100 may comprise a first active acoustic radiator 104 and a second active acoustic radiator 106. The first active acoustic radiator 104 and the second active acoustic radiator 106 may face each other (e.g., opposite each other). The first active acoustic radiator 104 may comprise a first movable diaphragm 108. The second active acoustic radiator 106 may comprise a second movable diaphragm 110. The first movable diaphragm 108 and / or the second movable diaphragm 110 are configured as voids, flat pistons, or other mechanically stable cones and can distribute voice coil forces over their radiating surface area (Sd). The combined surface area of ​​the first movable diaphragm 108 and / or the second movable diaphragm 110 may be the sum of the surface areas of the diaphragms of a conventional transducer assembly replaced by the transducer assembly 100, and can produce similar air movement and displacement. A movable seal may be provided on the movable diaphragm, positioned off-center at the edge of the diaphragm, to prevent air from escaping beyond the diaphragm and surrounding structures or ducts.

[0042] The first active acoustic radiator 104 may include a first rear suspension 112 (e.g., a spider). The first rear suspension 112 may be located behind the first movable diaphragm 108. The second active acoustic radiator 106 may include a second rear suspension 114 (e.g., a spider). The second rear suspension 114 may be located behind the second movable diaphragm 110.

[0043] The first active acoustic radiator 104 may include a first motor assembly 116. The second active acoustic radiator 106 may include a second motor assembly 118. The first motor assembly 116 and the second motor assembly 118 may each include fixed and / or permanent magnets (e.g., ceramic or rare-earth magnets), ferromagnetic components that conduct magnetic flux to the air gap (e.g., yokes, plates, steel components, etc., with pole pieces), a voice coil, and / or former elements. For example, the first motor assembly 116 may include a first yoke 152. The second motor assembly 118 may include a second yoke 154. The first motor assembly 116 may include a first pole piece 156, which may be part of the first yoke 152. The second motor assembly 118 may include a second pole piece 158, which may be part of the second yoke 154. The voice coil is wound on a former element and positioned around a first pole piece 156 and a second pole piece 158, and can be partially immersed in a magnetic field. The former element holding each voice coil may move freely in response to the electrical signal applied to the coil. The former element may be hollow. The pole pieces and / or former elements may have periphery of various shapes, which may include at least circular, oval, elliptical, and / or rectangular shapes.

[0044] The first motor assembly 116 and the second motor assembly 118 may be centrally located. In some embodiments, the two motor assemblies may be in contact or separated by a gap or other material. The first motor assembly 116 may be located in front of the first movable diaphragm 108, and this arrangement may include being located within the void of the first movable diaphragm 108 and / or on the side of the first movable diaphragm 108 opposite the first rear suspension 112. The second motor assembly 118 may be located in front of the second movable diaphragm 110, and this arrangement may include being located within the void of the second movable diaphragm 110 and / or on the side of the second movable diaphragm 110 opposite the second rear suspension 114. The first motor assembly 116 may be located between the first movable diaphragm 108 and the second movable diaphragm 110. The second motor assembly 118 may be located between the first movable diaphragm 108 and the second movable diaphragm 110. The first active acoustic radiator 104 may include a first axis 124. The first axis 124 may be the central axis of the first active acoustic radiator 104, the first motor assembly 116, the voice coil of the first motor assembly 116, and / or the former element of the first motor assembly 116. The second active acoustic radiator 106 may include a second axis 126. The second axis 126 may be the central axis of the second active acoustic radiator 106, the second motor assembly 118, the voice coil of the second motor assembly 118, and / or the former element of the second motor assembly 118. In some modifications, the first axis 124 and the second axis 126 may be coaxial and / or parallel to each other. In some modifications, the first axis 124 and the second axis 126 may be oriented at an angle to each other so as to reduce the combined reaction force in the normal direction during the driving of the transducer assembly 100. Since the first motor assembly 116 and the second motor assembly 118 are driven to move closer to and further apart from each other, the combined reaction force around the axis of the transducer assembly 100 can be reduced. As shown in Figure 1, the axis may be an axis that lies coaxial with the first axis 124 and the second axis 126.

[0045] The transducer assembly 100 may include a front structural member 120 (e.g., a front suspension component) that can connect the first active acoustic radiator 104 and the second active acoustic radiator 106. In some modifications, each of the first active acoustic radiator 104 and the second active acoustic radiator 106 may include a front suspension member (e.g., a front suspension component) that can be separated or connected together.

[0046] The transducer assembly 100 may include a slot 122 positioned between a first active acoustic radiator 104 and a second active acoustic radiator 106, through which air and acoustic output from the first active acoustic radiator 104 and / or the second active acoustic radiator 106 can flow. In some modifications, the transducer assembly 100 may include or be connected to a manifold that directs sound to multiple locations. The first motor assembly 116 and the second motor assembly 118 may be positioned within the slot 122. The slot may have additional shaping intended to smooth the bidirectional airflow generated during operation or to reduce acoustic resonance within the slot.

[0047] In some variations, the transducer assembly 100 may include a frame 102. The first active acoustic radiator 104 and the second active acoustic radiator 106 can be positioned (e.g., mounted) within the frame 102, and this positioning may include connection to the frame 102. The frame 102 may have a shape and / or size that fits within a region 130 of the interior trim 128 (e.g., an opening, cavity, mounting location, wrapping, packaging material, etc.). The transducer assembly 100 may be connected to the interior trim 128 as an assembly unit with the frame 102. In some variations, the first active acoustic radiator 104 and the second active acoustic radiator 106 may be integral with the frame 102. In some variations, the first active acoustic radiator 104 may be positioned within a first frame, and the second active acoustic radiator 106 may be positioned within a second frame. The first and second frames may have a shape and / or size that fits within a region 130. The first active acoustic radiator 104 and / or the second active acoustic radiator 106 may be located within the plenum space of the frame 102. In some modifications, the frame 102 may include a sealed air volume (e.g., a speaker enclosure such as a seal, porting, and / or passive radiator enclosure) that can be separated from the air volume on both sides of the mounting wall (e.g., interior trim 128). In some modifications, the frame 102 may include an internal fluid volume or plenum. The first active acoustic radiator 104 and / or the second active acoustic radiator 106 may be located within the internal fluid volume or plenum.

[0048] In some modifications, the first motor assembly 116 and the second motor assembly 118 may be connected together, constrained within the structure, or both. In some modifications, a structural member (e.g., a frame, a support) may be placed between the first active acoustic radiator 104 and the second active acoustic radiator 106, connecting the first motor assembly 116 and the second motor assembly 118 together. For example, the structural member may connect the pole pieces of the first motor assembly 116 and the second motor assembly 118 together.

[0049] The first active acoustic radiator 104 and the second active acoustic radiator 106 may include shapes and / or sizes that allow for compact packaging of a conventional speaker within the dimensions of area 130 of the interior trim 128. While a conventional speaker may be oriented to generate a reaction force perpendicular to the mounting surface of area 130, the first active acoustic radiator 104 and the second active acoustic radiator 106 of the transducer assembly 100 may be oriented to generate a reaction force parallel to the mounting surface of area 130. The first active acoustic radiator 104 and the second active acoustic radiator 106 can be positioned so that their components fit within packaging material having the full depth, width, and / or length of a standard oval or circular speaker-type assembly, thereby allowing the transducer assembly 100 to be installed as a conventional speaker within the same area 130 (e.g., an opening).

[0050] The first motor assembly 116 and the second motor assembly 118 can be driven by signals having the same electrical polarity. The first motor assembly 116 and the second motor assembly 118 can generate an acoustic output proportional to the electrical signal input. The movable parts of the first active acoustic radiator 104 and the second active acoustic radiator 106 (e.g., formers, voice coils, and / or diaphragms) can move toward and away from each other when the first motor assembly 116 and the second motor assembly 118 are driven, and can generate reaction forces in the opposite direction to the direction of movement to balance (e.g., reduce or eliminate) the reaction forces.

[0051] In some modifications, the active acoustic radiators of the transducer assembly 100 (e.g., the first active acoustic radiator 104 and the second active acoustic radiator 106) may operate in an infinite baffle configuration. In some modifications, one or both of the first active acoustic radiator 104 and the second active acoustic radiator 106 may be mounted in an enclosure of a specified volume and in the form of acoustic loading (e.g., sealing, reflex, etc.).

[0052] Figure 2A shows the transducer assembly 100, where arrows indicate the direction of movement of movable motor assembly components (e.g., diaphragm, voice coil, former) and the corresponding airflow, which are driven to move closer to each other. As the movable motor assembly components move closer to each other, as indicated by arrow 142, an airflow is generated out of the slot 122 (e.g., the void as a plenum), as indicated by arrow 136. The first active acoustic radiator 104 and the second active acoustic radiator 106 can move air from the second void 134, which may be located within the interior trim 128 of the vehicle, into the first void 132, out of the slot 122, as indicated by arrow 136, and in the direction of arrow 140. As described herein, the movement of the movable components of the first active acoustic radiator 104 and the second active acoustic radiator 106 toward each other can generate reaction forces, but movement in the opposite direction can balance these reaction forces (e.g., reduce or eliminate them). In some modifications, the first active acoustic radiator 104 and the second active acoustic radiator 106 are connected to a frame 102, which transmits forces between the first active acoustic radiator 104 and the second active acoustic radiator 106 through the frame 102 and can balance the reaction forces resulting from the movement. In some modifications, a structural member 138 (e.g., a frame, support, etc.) is positioned between the first active acoustic radiator 104 and the second active acoustic radiator 106 and can connect (e.g., receive) the first motor assembly 116 and the second motor assembly 118 (e.g., pole pieces) together. The reaction forces along the common axis of the first active acoustic radiator 104 and the second active acoustic radiator 106 can be borne by the structural member 138. The structural member 138 can facilitate and improve the transmission of forces between the first motor assembly 116 and the second motor assembly 118, balance reaction forces, and reduce the transmission of forces to the interior trim 128, thereby reducing or eliminating BSR problems (e.g., vibration). The structural member 138 can be connected to a surface 160, which may be part of the vehicle frame 102 and / or interior trim 128.

[0053] Figure 2B shows the transducer assembly 100, where arrows indicate the direction of movement of movable motor assembly components (e.g., diaphragm, voice coil, former) and the corresponding airflow, which are driven to separate from each other. As the movable motor assembly components move to separate from each other, as indicated by arrow 142, an airflow is generated toward the slot 122 (e.g., the void as a plenum), as indicated by arrow 136. The first active acoustic radiator 104 and the second active acoustic radiator 106 can move air from the first void 132 into the slot 122 and the second void 134 in the direction of arrow 136, as indicated by arrow 140. As described herein, the separation of the movable components of the first active acoustic radiator 104 and the second active acoustic radiator 106 can generate reaction forces, but movement in the opposite direction can balance these reaction forces (e.g., reduce or eliminate them). The frame 102 and / or structural members 138 can help balance these reaction forces.

[0054] In some modifications, the first motor assembly 116 and the second motor assembly 118 may together be referred to as a single integrated motor assembly having a magnetic circuit assembly. In some modifications, the first motor assembly 116 may also be referred to as the first part of the magnetic circuit assembly. In some modifications, the second motor assembly 118 may also be referred to as the second part of the magnetic circuit assembly. The first and / or second parts may include fixed and / or permanent magnets (e.g., rare-earth magnets), components that conduct magnetic flux to the air gap (e.g., yokes, plates, steel components, etc., with pole pieces), voice coils, and / or former elements. In some modifications, the first and / or second parts may include a shared yoke, which may include at least two magnetic gaps (e.g., one magnetic gap for the first voice coil of the first part and the other magnetic gap for the second voice coil of the second part). The magnetic circuit formed by these components may deliver flux in the same or opposite directions.

[0055] Figure 3A shows the piston area 144 (e.g., Sd) of the first movable diaphragm 108 of the first active acoustic radiator 104 and the piston area 146 (e.g., Sd) of the second movable diaphragm 110 of the second active acoustic radiator 106. The shape (e.g., circular, oval, elliptical, rectangular, etc.) and / or size of the piston area 144 and piston area 146 may be identical. As will be described in detail here, the combined piston area (e.g., Sd) of the piston area 144 and piston area 146 may be identical or similar to the piston area 150 of the movable diaphragm 162 of a conventional active acoustic radiator 148 that replaces the transducer assembly 100, which may have an oval shape as shown in Figure 3B. The inverted topography of the first active acoustic radiator 104 and the second active acoustic radiator 106 allows the combined piston area of ​​piston area 144 and piston area 146 to be the same as or similar to the piston area 150 of the conventional active acoustic radiator 148 that is replaced by the transducer assembly 100, while also enabling efficient use of space so that the transducer assembly 100 can fit within the same size packaging material as the conventional active acoustic radiator 148. Therefore, the sweep air volume of the first active acoustic radiator 104 and the second active acoustic radiator 106 can be the same as or similar to that of the conventional active acoustic radiator 148 that is replaced, with the same linear piston travel. As an example, the piston area 144 and piston area 146 are 103 cm² each. 2 Therefore, the total piston area of ​​150 is 206 cm². 2This is possible. This is a value similar to that of commonly used oval speaker sizes. Therefore, the assembly of opposing transducers can directly replace a commonly used oval speaker having the same linear voice coil travel, and thus can displace by the same amount of air. The external dimensions of the surround rolls of the first active acoustic radiator 104 and the second active acoustic radiator 106 may be 75 mm × 190 mm. The external dimensions of the surround rolls of the conventional active acoustic radiator 148 may be 160 mm × 236 mm.

[0056] In some variations, the first active acoustic radiator 104 and / or the second active acoustic radiator 106 may be physically coupled at the rear such that the first active acoustic radiator 104 and the second active acoustic radiator 106 face away from each other. For example, the first active acoustic radiator 104 and the second active acoustic radiator 106 may comprise a motor assembly having a first magnet, a first upper plate, a second magnet, a second upper plate, and a yoke with two magnetic gaps. The magnets can be magnetized in opposite directions, which may require an assembly with pre-magnetized magnets. The magnets can be magnetized in the same direction, which allows for magnetization after assembly. In some variations, the first yoke 152 and the second yoke 154 may be coupled together. In some variations, the first yoke 152 and the second yoke 154 may be part of a yoke (e.g., component). The voice coils of the first active acoustic radiator 104 and the second active acoustic radiator 106 are positioned in a separated gap in the yoke and may be configured to move toward and away from each other when driven by signals having the same electrical polarity. The magnetic field directions in the separated magnetic gap may be the same or opposite.

[0057] Figures 4A and 4B show front and rear perspective views of the transducer assembly 200, which may also be referred to as a dual opposing inverting transducer. The transducer assembly 200 may include at least any of the features illustrated and / or described with reference to the transducer assembly 100.

[0058] The transducer assembly 200 may comprise a first active acoustic radiator 204 and a second active acoustic radiator 206. The first active acoustic radiator 204 and the second active acoustic radiator 206 may face each other (e.g., opposite each other). The first active acoustic radiator 204 may comprise a first movable diaphragm 208. The second active acoustic radiator 206 may comprise a second movable diaphragm 210. The first movable diaphragm 208 and / or the second movable diaphragm 210 are configured as voids, flat pistons, or other mechanically stable cones and can distribute voice coil forces over their radiating surface area (Sd). The combined surface area of ​​the first movable diaphragm 208 and / or the second movable diaphragm 210 may be the sum of the surface areas of the diaphragms of the conventional transducer assembly replaced by the transducer assembly 200, and can result in similar air movement and displacement. The first movable diaphragm 208 and / or the second movable diaphragm 210 may be provided with a movable seal positioned off-center at the edge of the diaphragm to prevent air from escaping beyond the moving diaphragm and surrounding structures or ducts. The movable seal may have the shape of a surround roll or other flexible shape and may be formed of a flexible material to allow movement.

[0059] The first active acoustic radiator 204 may comprise a first motor assembly 216 and a first rear suspension 212. The topology of the first active acoustic radiator 204 can be reversed so that the first motor assembly 216 and the first rear suspension 212 are positioned on either side of the first movable diaphragm 208. The first motor assembly 216 may be at least partially positioned within the void of the first movable diaphragm 208.

[0060] The second active acoustic radiator 206 may comprise a second motor assembly 218 and a second rear suspension 214. The topology of the second active acoustic radiator 206 can be reversed so that the second motor assembly 218 and the second rear suspension 214 are positioned on either side of the second movable diaphragm 210. The second motor assembly 218 may be at least partially positioned within the void of the second movable diaphragm 210. The first motor assembly 216 and the second motor assembly 218 may be positioned between the first movable diaphragm 208 and the second movable diaphragm 210.

[0061] The first motor assembly 216 and the second motor assembly 218 are driven to move closer to and further away from each other in response to electrical input, so that the combined reaction forces around the axis of the transducer assembly 200 can be balanced (e.g., reduced or eliminated). The transducer assembly 200 may include a frame 202. The first active acoustic radiator 204 and the second active acoustic radiator 206 are connected to the frame 202, facilitating the transmission of forces between the first active acoustic radiator 204 and the second active acoustic radiator 206 and balancing the reaction forces resulting from the movement.

[0062] In some variations, a structural member 238 (e.g., a frame, support, etc.) is positioned between the first active acoustic radiator 204 and the second active acoustic radiator 206 and can connect (e.g., receive) the first motor assembly 216 and the second motor assembly 218 (e.g., a yoke) together. The reaction forces along the common axis of the first active acoustic radiator 204 and the second active acoustic radiator 206 can be borne by the structural member 238. The structural member 238 can facilitate and improve the transmission of forces between the first motor assembly 216 and the second motor assembly 218, balance the reaction forces, thereby reducing the transmission of forces to the interior trim of the vehicle and reducing or eliminating BSR problems (e.g., vibration). The structural member 238 can be connected to the frame 202, and this connection may include a connection to the periphery wall 274 of the frame 202. The frame 202 may include reinforcing structural features.

[0063] In some variations, the transducer assembly 200 may include a mounting flange 276. The mounting flange 276 can be used to mount the transducer assembly 200 in a variety of environments, which may include at least one of those described herein.

[0064] The transducer assembly 200 may include a slot 222. The slot 222 may be located between the first movable diaphragm 208 and the second movable diaphragm 210. With the first motor assembly 216 and the second motor assembly 218 in operation, air can move in and out through the slot 222 from between the first movable diaphragm 208 and the second movable diaphragm 210, generating sound. In some embodiments, the slot may be connected to a duct or other acoustic path for acoustic transmission. In some embodiments, the slot may be connected to a plurality of outlet areas.

[0065] Figures 4C to 4F show cross-sectional views of the transducer assembly 200. As shown, the first motor assembly 216 may comprise a first voice coil 282 arranged around a first former 278, a first magnet 264, a first pole piece 256, and / or a first yoke 252, the yoke may also be referred to as a u-yoke, shell pot, and / or shell pot yoke. The first former 278 may be arranged around a portion (e.g., the central portion) of the first pole piece 256, the first magnet 264, and / or the first yoke 252. The first voice coil 282, the first former 278, the first pole piece 256, the first magnet 264, and / or the first yoke 252 may be centered on the first axis 224 of the first active acoustic radiator 204.

[0066] The first pole piece 256 can be connected (e.g., coupled) to the first magnet 264. The first pole piece 256 may include an internal recess, which may include a hollowed-out shape with an inner chamfer. The first magnet 264 can be connected to the first yoke 252. The first magnet 264 may be axially positioned between the first pole piece 256 and the first yoke 252. The first yoke 252 may include a first annular gap 290 that can receive the first former 278 and / or the first voice coil 282 when the first motor assembly 216 is driven. The first yoke 252 may include a first circumferential wall 286, which may include an annular shape. The first circumferential wall 286 may be radially positioned around the first magnet 264, the first pole piece 256, the first voice coil 282, and / or the first former 278. The magnetic gap may be radially positioned between the first pole piece 256 and the first peripheral wall 286 of the first yoke 252. The first voice coil 282 may be positioned within the magnetic gap.

[0067] The first yoke 252 (e.g., the first circumferential wall 286) may be connected to a structural member 238. For example, the structural member 238 may include a horizontal flange 268 that can be connected to a frame 202 (e.g., a circumferential wall 274). The horizontal flange 268 may extend radially inward from the circumferential wall 274 toward the first axis 224. The horizontal flange 268 may include reinforcing structural features and may include a vertically oriented flange that can be connected to the circumferential wall 274. The structural member 238 may include a first mounting portion 270 that is connected to the first yoke 252 (e.g., the first circumferential wall 286). The first mounting portion 270 may be connected to the horizontal flange 268. The structural member 238 may structurally support the first yoke 252.

[0068] As shown in the figure, the second motor assembly 218 may comprise a second voice coil 284 arranged around a second former 280, a second magnet 266, a second pole piece 258, and / or a second yoke 254, the yoke may also be referred to as a u-yoke, shell pot, and / or shell pot yoke. The second former 280 may be arranged around a portion (e.g., the central portion) of the second pole piece 258, the second magnet 266, and / or the second yoke 254. The second voice coil 284, the second former 280, the second pole piece 258, the second magnet 266, and / or the second yoke 254 may be centered on the second axis 226 of the second active acoustic radiator 206.

[0069] The second pole piece 258 can be connected (e.g., coupled) to the second magnet 266. The second pole piece 258 may include an internal recess, which may include a hollowed-out shape with an inner chamfer. The second magnet 266 can be connected to the second yoke 254. The second magnet 266 may be axially positioned between the second pole piece 258 and the second yoke 254. The second yoke 254 may include a second annular gap 292 that can receive the second former 280 and / or the second voice coil 284 when the second motor assembly 218 is driven. The second yoke 254 may include a second circumferential wall 288, which may include an annular shape. The second circumferential wall 288 may be positioned around the second magnet 266, the second pole piece 258, the second voice coil 284, and / or the second former 280. The magnetic gap may be radially positioned between the second pole piece 258 and the second peripheral wall 288 of the second yoke 254. The second voice coil 284 may be positioned within the magnetic gap.

[0070] The second yoke 254 (e.g., the second peripheral wall 288) can be connected to a structural member 238. For example, the structural member 238 may include a second mounting portion 272 connected to the second yoke 254 (e.g., the second peripheral wall 288). The second mounting portion 272 can be connected to a horizontal flange 268. The second mounting portion 272 may be positioned on the opposite side of the horizontal flange 268 from the first mounting portion 270. The first mounting portion 270 and the second mounting portion 272 may be arranged in a mirror configuration around the horizontal flange 268. The structural member 238 can structurally support the second yoke 254.

[0071] During use, the first former 278 and second former 280 (e.g., cylindrical members) having the first and second voice coils 282 and 284 can move toward and away from each other due to the current applied to the first and second voice coils 282 and 284. For example, the first and second voice coils 282 and 284 can be placed within a magnetic gap (e.g., within the magnetic field of a magnet). An electrical signal, such as an audio signal, flows through the first and second voice coils 282 and 284, and the interaction between the electrical signal (e.g., current) and the magnetic field can produce a variable magnetic field around the first and second voice coils 282 and 284. The interaction between the magnetic fields of the first and second voice coils 282 and 284 and the magnetic field of a permanent magnet can cause the first and second voice coils 282 and 284, as well as the first and second formers 278 and 280, to move toward and away from each other. The direction of the current can change the direction of movement. The first and second diaphragms 208, 210 (e.g., cones) may be attached to the first and second formers 278, 280 and / or the first and second voice coils 282, 284, respectively. As the formers 278, 280 and the voice coils 282, 284 move, the first and second diaphragms 208, 210 also move, generating pressure waves in the air, which can be perceived as sound by the ear and / or microphone. The pitch and / or volume of the generated sound may be determined by the frequency and / or amplitude of the electrical signals.

[0072] The reaction forces along the common axis of the first active acoustic radiator 204 and the second active acoustic radiator 206 can be borne by the structural member 238. The structural member 238 can facilitate and improve the transmission of forces between the first motor assembly 216 and the second motor assembly 218, balance the reaction forces, and reduce the transmission of forces to the vehicle's interior trim, thereby reducing or eliminating BSR problems (e.g., vibration). The structural member 238 can be connected to a surface, which may be part of the vehicle's frame and / or interior trim.

[0073] In some modifications, the first shaft 224 and the second shaft 226 may be coaxial and / or parallel to each other. In some modifications, the first shaft 224 and the second shaft 226 may be oriented at an angle to each other so as to reduce the normal reaction force during the driving of the transducer assembly 200. The first motor assembly 216 and the second motor assembly 218 are driven to approach and separate each other so as to reduce the reaction force around the axis of the transducer assembly 200. As shown in the figure, the axis of the transducer assembly 200 may be an axis coaxial with the first shaft 224 and the second shaft 226.

[0074] As shown in the figure, the outer periphery of the first movable diaphragm 208 and / or the second movable diaphragm 210 is sealed to prevent air from escaping beyond the first movable diaphragm 208, the second movable diaphragm 210, and / or the surrounding structure, and such sealing may include the implementation of a movable seal.

[0075] A magnetic circuit may refer to a magnet, magnetic pole piece, yoke, voice coil, magnetic gap, plate, and / or other features used to move a diaphragm to a voice coil in response to an electrical signal.

[0076] The scope of the Disclosure disclosed herein is not limited to any particular embodiment of the Disclosure herein. For example, in some examples, the transducer assembly is described in relation to the interior trim of a vehicle, but the transducer assemblies described herein may also be used in other contexts. Various modifications and alternative forms may be made to the Disclosure herein, but specific examples are shown in the drawings and described herein in detail. The Disclosure herein is not limited to the detailed forms or methods disclosed herein, but rather encompasses all equivalents, modifications, and alternatives contained in the various embodiments described herein and the appended claims and the ideas therein. Further embodiments may be formed by combining various features of the assemblies and components described herein, and such embodiments are part of the Disclosure herein. In some examples, the transducer assembly may represent a collection of multiple transducers and a support structure.

[0077] This disclosure includes methods of using the described embodiments (including devices, apparatus, assemblies, structures, etc.), which may include using or assembling one or more of the features disclosed herein to realize the functions and / or features of the system as described herein. This disclosure also includes methods of manufacturing the aforementioned system, which may include providing, creating, connecting, assembling, and / or installing one or more of the features of the system disclosed herein to realize the functions and / or features of the system as described herein.

[0078] Needless to say, from the perspective of the above teachings, various other modifications, adaptations, and alternative designs are possible. Therefore, at present, within the scope of the attached claims, this disclosure may be implemented in ways other than those specifically described herein. Various combinations or partial combinations of the specific features and variations of the above embodiments may be made, and such combinations are considered to be included in one or more aspects of this disclosure. Furthermore, any particular features, aspects, methods, properties, characteristics, qualities, attributes, elements, etc., disclosed herein relating to the embodiments may be used in all other embodiments shown herein. Therefore, various features and variations of the disclosed embodiments may be combined with or substituted for each other to form various forms of this disclosure. Accordingly, the scope of this disclosure disclosed herein is not limited to any particular embodiment of the above disclosure. In addition, various modifications may be made to this disclosure, and alternative forms may be made, specific examples of which are shown in the drawings and described in detail herein. This disclosure is not limited to any particular form or method disclosed herein; on the contrary, this disclosure covers all modifications, equivalents, and alternatives included in the various embodiments described and the attached claims and the ideas therein. None of the methods disclosed herein are necessarily performed in the order they are described. The methods disclosed herein include specific actions performed by the parties concerned, but they may also include any third-party instructions, express or implied, of those actions. For example, an action such as "mounting the transducer on the bracket" includes "instructing the mounting of the transducer on the bracket." The scope disclosed herein also includes any and all overlaps, partial scopes, and combinations thereof. Language such as "maximum," "at least," "more than / greater," "less than / smaller," and "between" includes the stated numbers. Terms preceding numbers such as "approximately," "about," and "about" as used herein include the stated numbers (e.g., about 10% = 10%) and also indicate a quantity close to the stated quantity that performs the desired function or achieves the desired result.For example, the terms “approximately,” “about,” and “abbreviated” may indicate quantities that are less than 10%, less than 5%, less than 1%, less than 0.1%, and less than 0.01% of the stated quantity. Where specific dimensions are disclosed, they are merely design examples and do not imply the exclusion or preclude the use of parts of different sizes to perform the same basic function in the context of the embodiments described herein. [Explanation of Symbols]

[0079] 100…Transducer assembly, 102…Frame, 104…First active acoustic radiator, 106…Second active acoustic radiator, 108…First movable diaphragm, 110…Second movable diaphragm, 112…First rear suspension, 114…Second rear suspension, 116…First motor assembly, 118…Second motor assembly, 120…Front structural member, 122…Slot, 124…First shaft, 126… Second axis, 128... Interior trim, 130... Area, 132... First gap, 134... Second gap, 136... Arrow, 138... Structural member, 140... Arrow, 142... Arrow, 144... Piston area, 146... Piston area, 148... Active acoustic radiator, 150... Piston area, 152... First yoke, 154... Second yoke, 156... First pole piece, 158... Second pole piece, 160... Surface, 162... Movable diaphragm, 200... Transducer 202...Frame, 204...First active acoustic radiator, 206...Second active acoustic radiator, 208...First movable diaphragm, 210...Second movable diaphragm, 212...First rear suspension, 214...Second rear suspension, 216...First motor assembly, 218...Second motor assembly, 222...Slot, 224...First shaft, 226...Second shaft, 238...Structural member, 252...First yoke 254...Second yoke, 256...First pole piece, 258...Second pole piece, 264...First magnet, 266...Second magnet, 268...Horizontal flange, 270...First mounting section, 272...Second mounting section, 274...Circumferential wall, 276...Mounting flange, 278...First former, 280...Second former, 282...First voice coil, 284...Second voice coil, 286...First circumferential wall, 288...Second circumferential wall, 290...First annular gap, 292...Second annular gap

Claims

1. A vehicle transducer assembly, A frame configured to be incorporated into the interior trim of the aforementioned vehicle, A first active acoustic radiator is disposed within the frame and comprises a first movable diaphragm, a first rear suspension, and a first motor assembly having a first magnetic circuit and a first voice coil, wherein the first motor assembly is disposed in front of the first movable diaphragm, and the first rear suspension is disposed on the opposite rear side of the first movable diaphragm. A second active acoustic radiator is disposed within the frame and comprises a second movable diaphragm, a second rear suspension, and a second motor assembly having a second magnetic circuit and a second voice coil, wherein the second motor assembly is positioned in front of the second movable diaphragm, and the second rear suspension is positioned on the opposite rear side of the second movable diaphragm. The system comprises a structural member positioned between the first active acoustic radiator and the second active acoustic radiator, and configured to receive the first motor assembly and the second motor assembly, The first motor assembly and the second motor assembly are positioned between the first movable diaphragm and the second movable diaphragm. A transducer assembly in which the first voice coil and the second voice coil move toward and away from each other when the first active acoustic radiator and the second active acoustic radiator are driven by signals having the same electrical polarity, such that the combined reaction force is reduced around the axis.

2. The transducer assembly according to claim 1, further comprising a front structural member connected to and extending between the first active acoustic radiator and the second active acoustic radiator.

3. The transducer assembly according to claim 1, wherein the structural member is configured to connect the first motor assembly and the second motor assembly.

4. The transducer assembly according to claim 1, wherein the first motor assembly and the second motor assembly are located coaxially.

5. The transducer assembly according to claim 1, wherein the first movable diaphragm and the second movable diaphragm each have a conical shape, the first motor assembly is at least partially disposed within the conical void of the first movable diaphragm, and the second motor assembly is at least partially disposed within the conical void of the second movable diaphragm.

6. The transducer assembly according to claim 1, wherein the frame has a sealed air volume.

7. The transducer assembly according to claim 1, wherein the structural member is connected to the wall of the vehicle.

8. A frame having internal fluid volume or plenum, A first active acoustic radiator, disposed within the internal fluid volume or the plenum, having a first movable diaphragm, a first rear suspension, and a first motor assembly, wherein the first motor assembly has a first magnetic circuit and a first voice coil, and the first rear suspension and the first motor assembly are disposed on both sides of the first movable diaphragm, A second active acoustic radiator, disposed within the internal fluid volume or the plenum, having a second movable diaphragm, a second rear suspension, and a second motor assembly, wherein the second motor assembly has a second magnetic circuit and a second voice coil, and the second rear suspension and the second motor assembly are disposed on both sides of the second movable diaphragm, comprising a second active acoustic radiator, A transducer assembly in which the first voice coil and the second voice coil are configured to move toward and away from each other when the first active acoustic radiator and the second active acoustic radiator are driven by signals having the same electrical polarity.

9. The transducer assembly according to claim 8, further comprising a structural member disposed between the first active acoustic radiator and the second active acoustic radiator, and configured to receive the first motor assembly and the second motor assembly.

10. The transducer assembly according to claim 8, further comprising a first structural member and a second structural member disposed between the first active acoustic radiator and the second active acoustic radiator, wherein the first structural member receives the first motor assembly and the second structural member receives the second motor assembly.

11. The transducer assembly according to claim 8, wherein the first central axis of the first motor assembly and the second central axis of the second motor assembly are located coaxially.

12. The transducer assembly according to claim 8, wherein the first central axis of the first motor assembly and the second central axis of the second motor assembly are parallel.

13. The transducer assembly according to claim 8, wherein the first central axis of the first motor assembly and the second central axis of the second motor assembly are inclined relative to each other.

14. The transducer assembly according to claim 8, wherein the first movable diaphragm and the second movable diaphragm each have a conical shape, the first motor assembly is at least partially disposed within the conical void of the first movable diaphragm, and the second motor assembly is at least partially disposed within the conical void of the second movable diaphragm.

15. Frame and, A motor assembly having a magnetic circuit assembly, wherein the magnetic circuit assembly has a first part having a first voice coil and a second part having a second voice coil, A first active acoustic radiator supported by the frame and having a first movable diaphragm, wherein at least a portion of the first part of the magnetic circuit assembly is positioned in front of the first movable diaphragm, A second active acoustic radiator supported by the frame and having a second movable diaphragm, wherein at least a portion of the second part of the magnetic circuit assembly is positioned in front of the second movable diaphragm, comprising: A transducer assembly in which the first voice coil and the second voice coil are configured to move toward and away from each other when the first active acoustic radiator and the second active acoustic radiator are driven by signals having the same electrical polarity.

16. The transducer assembly according to claim 15, wherein the first movable diaphragm and the second movable diaphragm each have a conical shape, the first portion of the magnetic circuit assembly is at least partially disposed within the conical void of the first movable diaphragm, and the second portion of the magnetic circuit assembly is at least partially disposed within the conical void of the second movable diaphragm.

17. The transducer assembly according to claim 15, further comprising a structural member disposed between the first active acoustic radiator and the second active acoustic radiator, configured to receive the first and second portions of the magnetic circuit assembly.

18. The transducer assembly according to claim 15, further comprising a first structural member and a second structural member disposed between the first active acoustic radiator and the second active acoustic radiator, wherein the first structural member receives the first portion of the magnetic circuit assembly and the second structural member receives the second portion of the magnetic circuit assembly.

19. The transducer assembly according to claim 15, wherein the magnetic circuit assembly is located within the plenum space of the transducer assembly.

20. The transducer assembly according to claim 15, wherein the first voice coil and the second voice coil are located coaxially.

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