acoustic waveguide

Abstract

An acoustic waveguide according to one or more embodiments of the technology includes a housing having a proximal end with an inlet aperture and a distal end with an outlet aperture, and a mounting flange disposed at the proximal end and configured to acoustically couple a driver to the inlet aperture. A plurality of sound channels extend through the housing and acoustically couple the inlet aperture to the outlet aperture. Each sound channel at least partially defining a sound path has an acoustic length, wherein at least one sound path of the plurality of sound channels has a bend angle exceeding 180 degrees.

Description

[0001] Cross-referencing related applications

[0002] This application claims priority and benefit to U.S. Provisional Application No. 62 / 994,754, filed March 25, 2020, which is incorporated herein by reference in its entirety. Technical Field

[0003] This disclosure generally relates to multipath acoustic waveguides. Background Technology

[0004] In audio loudspeakers, one factor determining sound quality is sound pressure level (SPL), which typically depends in part on the loudspeaker size relative to the distance between the loudspeaker and the listener. Generally, greater distances require larger loudspeaker sizes. However, there are practical limitations to the size of large loudspeakers. One solution is to use an array of smaller loudspeakers to achieve a similar acoustic effect, as sound waves from individual smaller loudspeakers can be combined to produce combined sound waves that behave similarly to those emitted from a single large loudspeaker. It is generally accepted that the spacing between two adjacent loudspeakers needs to be smaller than the wavelength of the relevant sound wave. The wavelength of a wave is determined by dividing the wave speed by the wave frequency. The speed of sound in room temperature air is approximately 1130 feet per second. For example, for a low-frequency audio sound with a frequency of 200 Hz, the corresponding wavelength is approximately 68 inches. Similarly, for a mid-frequency audio sound with a frequency of 2000 Hz, the corresponding wavelength is approximately 6.8 inches. An exemplary high-frequency audio sound with a frequency of 20000 Hz has a wavelength of approximately 0.68 inches. For high-frequency sounds, it is difficult to achieve this small distance between loudspeakers. This relatively small wavelength poses a problem in providing the desired spacing between high-frequency loudspeakers.

[0005] Acoustic waveguides have been developed to provide improved sound distribution from a selected high-frequency driver. Examples of such improved waveguides include those and related technologies set forth in U.S. Patent Nos. 7,177,437, 7,953,238, 8,718,310, 8,824,717, and 9,204,212, and U.S. Patent Application Publication No. US2019-0215602, each of which is incorporated herein by reference in its entirety. While these waveguides provide significant improvements, particularly for the transmission of high-frequency audio sounds, there remains a need to distribute the emission of sound waves across the front of the loudspeaker, thereby producing a planar or cylindrical wavefront. Attached Figure Description

[0006] Figure 1 This is a front view of an acoustic waveguide according to an embodiment of the present technology.

[0007] Figure 2 yes Figure 1 Top rear perspective view of the acoustic waveguide.

[0008] Figure 3 yes Figure 1 Left side view of the acoustic waveguide.

[0009] Figure 4 It is basically along Figure 1 The planar cross-section of the acoustic waveguide is shown in line 4-4.

[0010] Figure 5 This is a front view of an acoustic waveguide according to another embodiment of the present technology.

[0011] Figure 6 yes Figure 5 Top rear perspective view of the acoustic waveguide.

[0012] Figure 7 yes Figure 5 Left side view of the acoustic waveguide.

[0013] Figure 8 It is basically along Figure 5 The cross-sectional plan view of the acoustic waveguide taken from line 8-8.

[0014] Figure 9A and 9B They are Figure 1 Schematic detailed views of the lateral and vertical flare profiles of the acoustic waveguide.

[0015] Figure 10A and 10B They are Figure 5 Schematic detailed views of the lateral and vertical opening profiles of the acoustic waveguide. Detailed Implementation

[0016] The technology disclosed herein relates to acoustic waveguides and associated systems. Several embodiments of this technology relate to acoustic waveguides configured to be coupled to one or more selected high-frequency loudspeaker drivers and including a channel configured to guide acoustic waves generated by the loudspeaker drivers through the channel and out of the front and distal ends of the acoustic waveguide. Specific details of this technology are described herein. Figure 1-8 The description is provided. While many embodiments of acoustic waveguides have been described, it should be noted that other applications and embodiments besides those disclosed herein are also within the scope of this technology. Furthermore, embodiments of this technology may have different configurations, components, and / or processes than those shown or described herein. Moreover, those skilled in the art will understand that embodiments of this technology may have configurations, components, and / or processes other than those shown or described herein, and that these and other embodiments may exist without the several configurations, components, and / or processes shown or described herein without departing from this technology.

[0017] Figure 1-4 An acoustic waveguide 100 according to an embodiment of the present technology is shown. The waveguide 100 of the shown embodiment is configured to receive a loudspeaker driver 101 ( Figure 3 For example, a high-frequency compression driver is coupled to a source signal generator ("SSG") that provides an electrical signal to driver 101. Driver 101 generates sound waves with a selected frequency. The waveguide 100 of the illustrated embodiment is configured for use with a high-frequency driver that generates high-frequency sound waves in the frequency range of approximately 500 Hz to 20 kHz. Other embodiments may be configured for use with an intermediate-frequency driver or other drivers that generate sound waves in different frequency ranges. The waveguide 100 of the illustrated embodiment is configured to guide sound received from driver 101 through waveguide 100 to a plurality of exit apertures 126a-h, such that the sound is distributed across multiple sound paths and exits the exit apertures 126a-h at the distal end 182 of waveguide 100 in a selected direction, and has a coherent wavefront for the desired sound distribution range from waveguide 100. This configuration can allow multiple waveguides to be arranged together to generate a generally cylindrical wavefront across an array, thereby allowing sound to be emitted for further projection.

[0018] The waveguide 100 shown includes a housing 103 having an upper housing portion 102 and a lower housing portion 104 that can be coupled to a driver 101. In some embodiments, the housing portions 102 and 104 have mating planes (e.g., ...) with respect to each housing portion 102 and 104. Figure 4 The cross-sectional plane, in Figure 1 and 3 (As shown in the diagram) Mirror symmetry and can be assembled together in a multi-piece configuration, which may include a clamshell arrangement using one or more mounting holes 128. The proximal portion 108 of the waveguide 100 has a proximal mounting flange 114 configured to securely receive the driver 101. In the illustrated embodiment, the mounting flange 114 has one or more mounting holes 118 that receive fasteners to secure the driver 101 to the mounting flange 114, wherein the output of the driver is axially aligned with the mounting flange 114. When the driver 101 is activated, the high-frequency sound output is directed into an inlet hole 116 in the mounting flange 114 and along a plurality of different, separate, bow-shaped channels 120a-h connected to the inlet hole 116 through the housing 103.

[0019] like Figure 4As best shown, sound channels 120a-h extend through waveguide 100 and terminate at a plurality of adjacent outlet holes 126a-h located at the distal end 182 of housing 103. In the illustrated embodiment, a distal mounting flange 110 is provided at the distal end 182 of housing 103, typically adjacent to the outlet holes 126a-h. The distal mounting flange 110 can be configured to be secured to a speaker assembly (not shown) to hold the waveguide 100 and associated driver 101 in a selected location on or within the speaker assembly. In some embodiments, the distal mounting flange 110 can be used to secure the waveguide 100 to a horn in a selected alignment within the speaker assembly. In some configurations, the waveguide 100 can be an integral part of the speaker assembly, such that housing 103 does not include the distal mounting flange. For example, the distal portion of the waveguide may be directly embedded in the baffle of the speaker assembly.

[0020] like Figure 3 As shown, the driver 101 is fixed to the proximal mounting flange 114 and oriented relative to the housing 103 such that the front of the driver 101 (i.e., the portion of the driver 101 that emits high-frequency sounds) is axially aligned with the inlet port 116. In the illustrated embodiment, the front of the driver 101 is substantially parallel to the proximal mounting flange 114 and is generally orthogonal to the top and / or bottom surfaces 184 and 186 of the housing 103 near the mounting flange. In other embodiments, the front of the driver 101 and / or the mounting flange 114 may be oriented at another selected angle relative to the housing 103 or the inlet port 116. In such a mounting configuration, the driver 101 may be tilted relative to the housing, which is generally adjacent to the inlet port 116. In some embodiments, the front of the driver may be at an angle in the range of approximately 0° to 90° relative to the distal side of the housing and the outlet ports 126a-h.

[0021] like Figure 4 As shown, the inlet port 116 in the near-end mounting flange 114 is acoustically coupled to a plurality of spaced-apart channels 120a-h extending through the housing 103. The channels 120a-h are configured to divide the sound from the driver 101 and simultaneously guide their respective sound portions out of the waveguide 100 through adjacent distal outlet ports 126a-h in the coherent wavefront.

[0022] In the illustrated embodiment, housing portions 102 and 104 are configured to define eight channels 120a-h, which define paths through housing 103. In other embodiments, housing 103 may have more or fewer eight channels 120a-h, depending on the desired configuration of waveguide 100. In some embodiments, channels 120a-h are configured such that the ratio of the depth D of waveguide 100 to the total width 108 of exit apertures 126a-h is in the range of approximately 1:1.2 to 1:2. In some embodiments, this ratio is in the range of approximately 1:1.4 to 1:1.8. Figure 1-4 In the illustrated embodiment, the ratio of depth D to total width 108 is approximately 1:1.44. Figure 5-8 In the embodiment shown, which will be discussed in more detail below, the ratio of the waveguide depth D to the total width of the exit aperture is approximately 1:1.73.

[0023] Refer again Figure 4 Channels 120a-h partially define a plurality of sound paths 122a-h, each coupled to one of the driver 101 and spaced-apart exit holes 126a-h at the distal end 182 of housing 103. High-frequency sound waves travel from driver 101 through the plurality of channels 120a-h along sound paths 122a-h through housing 103 and exit housing 103 along 126a-h through the exit holes in a selected direction. In some embodiments, sound paths 122a-h have a geometry configured to intersect between frequencies in the range of approximately 500 Hz to 2 kHz.

[0024] like Figure 4 As shown, the channels 120a-h in the illustrated embodiment are curved and configured such that the sound paths 122a-h have substantially equal lengths (e.g., equal acoustic lengths), such that all high-frequency sound waves simultaneously entering the inlet aperture 116 from the driver 101 will exit their respective outlet apertures 126a-h substantially simultaneously to generate coherent wavefronts. At least some of the channels 120a-h in the waveguide 100 of the illustrated embodiment define curved paths with bends exceeding 180 degrees, which allows for elongation of the sound paths within the housing 103 while maintaining the minimum depth D of the housing, and simultaneously preserving the integrity of the sound waves moving through the bow-shaped sound paths. The dimensions and shapes of the channels 120a-h can be configured such that the sum of the cross-sectional areas of each channel 120a-h at a point near the inlet aperture 116 is substantially equal to the surface area of ​​the output surface of the driver 101.

[0025] After the acoustic waves from the driver enter the inlet aperture 116, they are split between the inlet channels 117a and 117b, further split between the sub-channels 121ab, 121cd, 121ef, and 121gh, and finally split into channels 120a-h. The acoustic waves entering the waveguide 100 travel the same distance as each of the other acoustic waves in the other channels 120a-h and arrive at the outlet aperture 126a-h at the distal end 182 substantially simultaneously. Based on the configuration of entrance channels 117a and 117b, sub-channels 121ab, 121cd, 121ef, and 121gh, and channels 120a-h, each high-frequency sound signal simultaneously entering waveguide 100 will simultaneously exit exit apertures 126a-h, even though they each pass through different entrance channels 117a and 117b, sub-channels 121ab, 121cd, 121ef, and 121gh, and travel in different directions. In other embodiments, the dimensions of each channel 120a-h can be configured such that some or all of the corresponding sound paths 122a-h have different lengths. In some embodiments, sound paths 122a-h have a depth D in waveguide 100 (see...). Figure 3 The acoustic length of the sound path 122a-h is between approximately 120% and 200% of the depth D of the waveguide 100. In other embodiments, the sound path 122a-h has an acoustic length between approximately 130% and 145% of the depth D of the waveguide 100. In still other embodiments, the sound path 122a-h has an acoustic length between approximately 138% and 141% of the depth D of the waveguide 100. In a further embodiment, the sound path 122a-h has an acoustic length of approximately 139.6% of the depth D of the waveguide 100.

[0026] After the sound waves leave the inlet channels 117a and 117b, the sub-channels 121ab, 121cd, 121ef, and 121gh impart an initial arcuate bend to the sound paths 122a-h. The initial arcuate bend laterally guides the sound paths 112a-h from a direction substantially perpendicular to the mounting flange 114. In this respect, the sub-channels 121ab, 121cd, 121ef, and 121gh change the direction of the sound waves from approximately 70° to approximately 90° at the inlet port 116. After the sound waves leave the sub-channels 121ab, 121cd, 121ef, and 121gh, the sound waves are divided into channels 120a-h, each channel being configured with multiple arcuate bends originating downstream of the sub-channels 121ab, 121cd, 121ef, and 121gh near the proximal ends 180 of the housing portions 102 and 104. The bends in the channels 120a-h can be substantially smooth (i.e., not abrupt) to avoid adverse interactions with sound waves traveling through the channels 120a-h. In some embodiments, the radius of curvature of the bends in the channels 120a-h is equal to or greater than twice the channel width.

[0027] In some embodiments, each channel 120a-h has a different arcuate bend based on the location of its outlets for the sub-channels 121ab, 121cd, 121ef, and 121gh, and the outlet aperture 126a-h for each sound path 122a-h. Waveguide 100 is generally about the parallel to... Figure 3 The view centered on the central axis of the inlet aperture 116 is planar mirror symmetric. Therefore, each pair of opposing channels 120a-h will have a mirror symmetric geometry with respect to the mirror symmetry plane (e.g., 120a and 120h, 120b and 120g, etc.). For example, in one embodiment, channels 120a and 120h are curved relative to each other at an angle between approximately 70° and 90°, forming the arcuate portions of sound paths 122a and 122h. Channels 120b and 120g are bent relative to each other at an angle between approximately 110° and 140°, forming the bow-shaped portions of sound paths 122b and 122g; channels 120c and 120f are bent relative to each other at an angle between approximately 170° and 200°, forming the bow-shaped portions of sound paths 122c and 122f; and channels 120d and 120e are bent relative to each other at an angle between approximately 240° and 280°, forming the bow-shaped portions of sound paths 122d and 122e. Each bend in the illustrated embodiment has a bend radius in the range of approximately 0.25 inches to 0.8 inches. In each sound path 122b-g, another bend following the initial bend in the sound channel 120b-g again changes the direction of the sound path 122b-g so that these paths are substantially parallel to the direction in which the sound waves travel as they enter the inlet aperture 116, aligning with the direction in which the sound is output from the waveguide 100. However, in other embodiments, any number of bends can be added to the channels 120a-h to change the direction of the sound paths 122a-h while maintaining the desired acoustic length of the sound paths.

[0028] exist Figure 1-4In the illustrated embodiment, the channel 120a-h has an opening configuration that extends all or part of the channel 120a-h. For example, in some embodiments, the channel 120a-h continuously opens laterally and / or vertically outward along its entire length in or downstream of the aforementioned curved region. In other embodiments, the channel 120a-h opens outward only in portions near the distal ends 182 of the housing portions 102 and 104. Typically, the channel 120a-h can have any suitable opening configuration, and one or both of the openings can continue until the sound waves reach the outlet aperture 126a-h. In some embodiments, the opening along the distal portion of the channel 120a-h is kept as relatively straight as possible, while the channel length is balanced by the curved portion of the channel 120a-h closer to the proximal end portion. Thus, the curved portion in the channel 120a-h is configured to maximize the length of the portion of the channel 120a-h having both lateral and vertical openings. These longer openings allow each opening sidewall to have a lower opening angle (i.e., closer to parallel sidewalls). This allows sound waves to exit the exit aperture 126a-h in a more planar, uniform wave configuration. This arrangement improves the wave summation at the exit of waveguide 100. The appropriately shaped openings also help to extend the low-frequency cutoff of the acoustic device.

[0029] The opening of one or more of the channels 120a-h can be achieved by changing the width of some or all of the channels, or by changing the height of some or all of the channels, or by changing both the width and height of some or all of the channels. The lateral opening of the channels 120a-h includes lateral opening surfaces 132a-h and 134a-h, respectively, and creates a single lateral joint wavefront, as will be explained in more detail below. The lateral opening surfaces of adjacent channels terminate at peaks, for example, lateral opening surfaces 132a and 134b terminate at peak 124ab, lateral opening surfaces 132b and 134c terminate at peak 124bc, and so on.

[0030] To ensure the lateral propagation of sound waves and their sufficient combination to form a combined wavefront, sound channels 120a-h (and 220a-f and 250a-f for acoustic waveguide 200, as described below) can begin to open laterally before reaching distal end 182 (e.g., as Figure 4 (As shown). With this configuration, high-frequency sound waves can begin to propagate outward before reaching the distal end 182, so as to merge into a single wavefront over a shorter distance after exiting the outlet holes 126a-h (and 226a-f, 256a-f for the acoustic waveguide 200). In some embodiments, an extension (not shown) may be positioned distal to the outlet hole to further guide the sound waves away from the sound path.

[0031] Laterally opening surfaces 132a-h and 134a-h gradually open and define an opening angle 146a-h at the distal portion of the sound channel 120a-h, which can be between approximately 5° and 25°, more preferably in the range of approximately 10° and 20°. In other embodiments, the laterally opening surfaces 132a-h and 134a-h have an opening angle 146a-h between approximately 12° and 18° at the distal portion of the sound channel 120a-h. In a further embodiment, the laterally opening surfaces 132a-h and 134a-h can have an opening angle 146a-h between approximately 14° and 16° at the distal portion of the sound channel 120a-h. The width of each outlet aperture 126a-h in the lateral direction can be between approximately 7% and 14% of the total width 108 of the waveguide 100. In the illustrated embodiment, the width of each exit aperture 126a-h in the lateral direction may account for approximately 8.33% of the total width 108 of the waveguide 100. In other embodiments with 12 to 8 channels, the width of each exit aperture 126a-h in the lateral direction accounts for approximately 8% to 13% of the total width 108 of the waveguide 100. Other embodiments with greater or fewer channel variations may have exit apertures 126a-h whose additional width in the lateral direction accounts for a portion of the width relative to the total width 108 of the waveguide 100.

[0032] It is worth noting that channels 120A-H exhibit pipe resonance, the frequency of which depends on the length of channels 120A-H. The depths of the laterally flared surfaces, 132A-H and 134A-H, are determined by the total depth D of waveguide 100, and the flared depth typically controls how low the frequencies that waveguide 100 can play. Therefore, the dimensions of channels 120A-H, including the length of the channel portions and the flared depth, are chosen such that at least one of the pipe resonance frequencies of channels 120A-H coincides with the lower end of the waveguide design spectrum. Consequently, waveguide 100 is provided with a sensitivity boost at approximately the crossover frequency, which couples with a sensitivity boost from the flared portions, providing enhanced waveguide performance at and around the crossover frequency.

[0033] In embodiments with lateral opening, there are typically laterally opening surfaces 132a-h and 134a-h, the depth of the opening portion of channel 120a-h is between approximately 80% and 87% of the depth D of waveguide 100, and / or the laterally opening portion of channel 120a-h occupies between approximately 57% and 73% of the total length of sound path 122a-h. In other embodiments, the depth of the opening portion of channel 120a-h is between approximately 83% and 87% of the depth D of waveguide 100, and / or the laterally opening portion of channel 120a-h occupies between approximately 60% and 64% of the total length of sound path 122a-h. In at least one embodiment, the depth of the opening portion of the channel 120a-h is between approximately 84% and 86% of the depth D of the waveguide 100, and / or the lateral opening portion of the channel 120a-h occupies between approximately 61% and 63% of the total length of the sound path 122a-h. In a further embodiment, the depth of the opening portion of the channel 120a-h is greater than approximately 82% of the depth D of the waveguide 100, and / or the lateral opening portion of the channel 120a-h occupies approximately 65% ​​of the total length of the sound path 122a-h. The lateral opening surfaces 132a-h and 134a-h may be defined by a conical shape having a fixed length, rho value, exit angle, inlet width, and outlet width. In another embodiment of the channel 120a-h having a resonant frequency different from the embodiments described above, the channel 120a-h may be longer or have different lengths, while having laterally opened surfaces 132a-h and 134a-h that form a percentage of the depth D of the waveguide 100. For example, the depth of the opened portion of the channel 100a-h may be in the range of approximately 55%-65%, or more specifically in the range of approximately 58%-62%, or more specifically in the range of approximately 59%-61%, or even more specifically in the range of 59.62%-60.98%. In another embodiment where the channel 120a-h has a resonant frequency different from the above embodiments, the depth of the open portion of the channel 120a-h may be in the range of approximately 49%-69%, or more specifically in the range of approximately 52%-66%, or more specifically in the range of approximately 54%-64%, or even more specifically in the range of 54.67%-63.63%.

[0034] The vertical opening of the channels 120a-h includes vertically opening surfaces 136a-h and 138a-h, respectively, and forms sound wave radiation to propagate sound waves vertically, such as sound wave radiation from a speaker, and produces a substantially constant radiation angle across a wide frequency range. In embodiments with vertical opening, typically with vertically opening surfaces 136a-h and 138a-h, the vertically opening portion of the channels 120a-h occupies approximately 20% to 30% of the total length of the sound path 122a-h. In other embodiments, the vertically opening portion of the channels 120a-h occupies approximately 23% to 27% of the total length of the sound path 122a-h. In a further embodiment, the vertically opening portion of the channels 120a-h occupies approximately 25% of the total length of the sound path 122a-h. The vertically opening surfaces 136a-h and 138a-h can be defined by a double-conical shape having a first portion with a fixed length, rho value, exit angle, and exit width, and a second portion with a fixed length, rho value, exit angle, and exit width. The vertically opening surfaces 136a-h and 138a-h can also be defined by other configurations, such as a cone-arc-conical configuration or an arc-arc-conical configuration.

[0035] In some embodiments, the vertically open surfaces 136a-h and 138a-h are configured to provide an acoustic dispersion pattern having an angle in the range of approximately 30°–130°. Figure 1-4 In the embodiment shown, the acoustic dispersion pattern forms an angle of approximately 105° with the distal end 182 along the vertical direction. Figure 5-8 In the illustrated embodiment, the acoustic dispersion pattern has an included angle of approximately 90°. In the coupling direction, the opening is brought to the outer surface of waveguide 100, so the opening can be as long as possible, even if the vertical horn opening begins to shape the wave in that direction before the opening is complete. This improves low-frequency loading and creates a more coherent line source in the coupling direction. Figure 9A and 9B The horizontal direction is shown in schematic form. Figure 9A ) and vertical ( Figure 9B Exemplary contours in the direction of the sound. For clarity and for illustrative purposes only, the contours are shown as having a straight sound path. These examples illustrate dimensional details of a representative configuration of the lateral and vertical opening in the channels 120a-h, which can define the bow-shaped channels.

[0036] It is anticipated that the opening shape described herein maximizes the efficiency of sound waves traveling through channels 120a-h in being transmitted to the air outside housing portions 102 and 104. The opening also helps suppress pipe resonances that may be present within channels 120a-h, for example, by adding an exponential curve to the opening surface. However, in other embodiments, channels 120a-h may not have an opening configuration, or the amount of opening may differ in some or all channels. In other embodiments, channels 120a-h may be further subdivided, for example by providing a shaped insert or partition structure (not shown) that divides channels 120a-h into two or more sub-channels, each sub-channel having the same total sound path length as the other channels 120a-h.

[0037] The size of a channel can also be adjusted by controlling the channel height along some or all of its length. For example, Figure 3 Side views of housing portions 102 and 104 of waveguide 100 are shown. Housing portions 102 and 104 include a rear mounting flange 114. During operation of waveguide 100, a high-frequency driver coupled to the rear mounting flange 114 can generate high-frequency acoustic waves that enter housing portions 102 and 104 through an inlet port 116. Upon entering housing portions 102 and 104, the high-frequency acoustic waves are directed through inlet channels 117a and 117b, and through infrasound channels 121ab, 121cd, 121ef, and 121gh, to channels 120a-h. Channels 120a-h are configured to direct acoustic waves toward the distal end 182 of housing portions 102 and 104.

[0038] In the illustrated embodiment, each channel 120a-h can be vertically opened as it approaches the distal end 182 of the housing portions 102 and 104, such that the channel has a first height H1 at a point near the entrance aperture 116. Figure 3 The first height H1 and the second height H2 are greater than the first height H1. In some embodiments, all channels 120a-h increase in height as they extend toward the distal end 182. In the illustrated embodiment, the distal end 182 of the waveguide 100 at the outlet apertures 126a-h is configured with an arcuate distal end 182 when viewed from a planar direction. Figure 4In some embodiments, the distal end 182 of the arc has a radius of about 70 inches and a local angle along an arc between about 5.5° and 6.5°; however, other radii and angles are also within the scope of this technology. Taking a local angle of the arc between about 11° and 13° results in an acoustic radiation beam at about 15° to the distal end 182. In this respect, stacking two adjacent acoustic waveguides 100 results in a coverage area of ​​about 30°, three adjacent acoustic waveguides result in about 45°, and so on. Other embodiments may have other opening configurations. For example, a single waveguide may be configured with almost no vertical opening or up to about 30° or 40° or greater.

[0039] When viewed from the side, the distal end 182 can be approximately perpendicular to the longitudinal axis of waveguide 100, for example, in Figure 3 In the direction shown. The shape of the arcuate distal end 182 can produce an acoustic wave profile for a wider distribution. In other embodiments, the waveguide 100 may be configured with a curved or substantially flat and / or planar distal end to further adjust the distribution of the acoustic wave profile leaving the waveguide. In further embodiments, the distal end of the waveguide may have other shapes (i.e., multiplanar, partially circular, partially spherical, etc., or combinations thereof), and the distal end may be at one or more selected angles relative to the longitudinal axis of the waveguide 100.

[0040] Figure 5-8 Another embodiment of an acoustic waveguide 200 configured according to the present technology is shown. Certain features of the acoustic waveguide 200 are similar to those of the waveguide 100. Figure 5-8 Roughly corresponding to Figure 1-4 Unless otherwise stated, similar features have similar reference numerals, except that the reference numerals in the 200 series are used for the acoustic waveguide 200. The acoustic waveguide 200 is configured to engage with two high-frequency compression drivers 201 that are laterally spaced from each other and coupled to mounting surfaces 214a and 214b at a proximal end 280. Mounting surfaces 214a and 214b may typically be positioned perpendicular to the top surface 284 of the housing portion 202 and the bottom surface 286 of the housing portion 204, and axially aligned with inlet holes 216a and 216b. In other embodiments, the mounting surfaces may be configured to position the drivers 201 at a selected angle relative to the distal surface of the waveguide (i.e., in the range of approximately 0°–90°). Although the illustrated embodiment is shown with two compression drivers 201, other embodiments may have other numbers of compression drivers 201 and corresponding mounting surfaces. The housing portions 202 and 204 of the limiting housing 203 are similar to the housing portions 102 and 104 of the waveguide 100, but have a different number of inlet holes, high-frequency channels, mounting surfaces, outlet holes, etc., as in Figure 5-8 As shown in the image.

[0041] Among other differences, acoustic waveguide 200 differs from waveguide 100 in that it has different but mirror-symmetric channels with respect to each high-frequency driver (HFD). In this respect, the plurality of channels 220a-f extending from inlet aperture 216a are mirror-symmetric about a vertical longitudinal plane parallel to the center of orientation and position equidistant between inlet apertures 216a and 216b, and the plurality of channels 250a-f extending from inlet aperture 216b. While the housing 203 exhibits the same mirror symmetry about the mounting surface, the mirror symmetry about the vertical longitudinal plane provides an increased sound field at outlet apertures 226a-f and 256a-f. Unlike waveguide 100, in acoustic waveguide 200, each different mirror-symmetric channel group (e.g., 220a-f or 250a-f) is not itself mirror-symmetric about the central axis of the corresponding inlet apertures 216a and 216b. For example, although the outermost channels 120a and 120h of waveguide 100 are mirror-symmetric about the central axis of inlet aperture 116, the outermost channels 220a and 220f (or 250a and 250f) are not mirror-symmetric about the central axis of inlet aperture 216a (or 216b).

[0042] In the illustrated embodiment, each group of channels 220a-f and 250a-f has six channels. In other embodiments, each group has more than four channels. The acoustic waveguide 200 may also omit the entrance channels (i.e., the entrance channels 117a and 117b of waveguide 100) and directly convert the sound waves to the sub-channels 221ab, 221cd, 221ef, 251ab, 251cd, and 251ef, etc., and other possible configurations. When compared with, for example... Figure 8 Compared to the channels 120a-h shown, channels 220a-f and 250a-f may include fewer or more bow-shaped bends. Channel 220 within the waveguide may also be configured to split or divide into more or fewer channel levels for a larger or smaller compression driver of choice.

[0043] The acoustic waveguide 200 includes two sets of high-frequency sound channels 220a-f and 250a-f, each coupled to a corresponding one of the two drivers 201. As described above with respect to waveguide 100, channels 220a-f and 250a-f terminate in outlet holes 226a-f and 256a-f in the distal end 282 of housing 203. In the illustrated embodiment, a distal mounting flange 210 is provided at the distal end 282 of housing 203, which is generally adjacent to outlet holes 226a-f and 256a-f. The distal mounting flange 210 can be configured to be secured to a speaker housing (not shown) to hold the acoustic waveguide 200 and the associated high-frequency driver 201 in proper position within the speaker housing. In some embodiments, the mounting flange 210 can be used to couple the acoustic waveguide 200 to a horn (not shown), such as a horn attached to a speaker housing.

[0044] In some embodiments, the laterally opening surfaces 232a-f, 234a-f, 262a-f, and 264a-f may have opening angles 246a-f and 286a-f between approximately 10° and 20°. In other embodiments, the laterally opening surfaces 232a-f, 234a-f, 262a-f, and 264a-f may have opening angles 246a-f and 286a-f between approximately 14° and 18°. In a further embodiment, the laterally opening surfaces 232a-f, 234a-f, 262a-f, and 264a-f may have opening angles 246a-f and 286a-f of approximately 16°. The width of each outlet aperture 226a-f and 256a-f in the lateral direction may account for approximately 7% to 14% of the total width 209 of the acoustic waveguide 200. In other embodiments, the width of each outlet aperture 226a-f and 256a-f accounts for approximately 8% to 13% of the total width 209 of the acoustic waveguide 200 in the lateral direction.

[0045] In embodiments with lateral opening, typically having laterally opening surfaces 232a-f, 234a-f, 262a-f, and 264a-f, the depth of the opening portions of channels 220a-f and 250a-f is between approximately 80% and 87% of the depth D of the acoustic waveguide 200, and / or the laterally opening portions of channels 220a-f and 250a-f occupy between approximately 57% and 73% of the total length of sound paths 222a-f and 252a-f. In other embodiments, the depth of the opening portions of channels 220a-f and 250a-f is between approximately 83% and 85% of the depth D of the acoustic waveguide 200, and / or the laterally opening portions of channels 220a-f and 250a-f occupy between approximately 62% and 68% of the total length of sound paths 222a-f and 252a-f. In a further embodiment, the depth of the open portions of channels 220a-f and 250a-f is greater than approximately 82% of the depth D of the acoustic waveguide 200, and / or the lateral open portions of channels 220a-f and 250a-f account for approximately 65% ​​of the total length of sound paths 222a-f and 252a-f. Laterally open surfaces 232a-f, 234a-f, 262a-f, and 264a-f may be defined by a conical shape having a fixed length, rho value, exit angle, and exit width. In another embodiment where channels 220a-f and 250a-f have resonant frequencies different from those described above, the depth of the opening portions of channels 220a-h and 250a-f with lateral opening surfaces 232a-f, 234a-f, 262a-f, and 264a-f can be in the range of approximately 65%-78%, or more specifically, in the range of approximately 68%-75%, or more specifically, in the range of approximately 70%-73%, or even more specifically, in the range of 70.73%-72.99%. Figure 10A and 10B The horizontal direction is shown in schematic form. Figure 10A ) and vertical ( Figure 10B Exemplary outlines in the direction. For clarity and for illustrative purposes only, the outlines are shown using a straightened sound path. These examples illustrate dimensional details of a representative configuration of lateral and vertical opening in channels 220a-f and 250a-f.

[0046] In embodiments with vertical opening, typically having vertically opening surfaces 236a-f, 238a-f, 266a-f, and 268a-f, the vertically opening portions of channels 220a-f and 250a-f occupy approximately 20% and 30% of the total length of sound paths 222a-f and 252a-f, respectively. In other embodiments, the vertically opening portions of channels 220a-f and 250a-f occupy between approximately 23% and 27% of the total length of sound paths 222a-f and 252a-f. In a further embodiment, the vertically opening portions of channels 220a-f and 250a-f occupy approximately 25% of the total length of sound paths 222a-f and 252a-f. The vertically opening surfaces 236a-f, 238a-f, 266a-f, and 268a-f may be defined by a double-conical shape having a first portion having a fixed length, rho value, exit angle, and exit width, and a second portion having a fixed length, rho value, exit angle, and exit width. In some embodiments, the vertically opening surfaces 236a-f, 238a-f, 266a-f, and 268a-f are configured to provide an acoustic dispersion pattern having an angle of approximately 90° with the distal end 282 along the vertical direction.

[0047] In some embodiments, sound paths 222a-f and 252a-f have a depth D in waveguide 200 (see...). Figure 7 The acoustic lengths of sound paths 222a-f and 252a-f are approximately 120% to 200% of the depth D of waveguide 200. In other embodiments, sound paths 222a-f and 252a-f have acoustic lengths between approximately 130% and 145% of the depth D of waveguide 200. In still other embodiments, sound paths 222a-f and 252a-f have acoustic lengths between approximately 136% and 3139% of the depth D of waveguide 200. In a further embodiment, sound paths 222a-f and 252a-f have acoustic lengths of approximately 136.7% of the depth D of waveguide 200.

[0048] As used in the foregoing description, the terms “vertical,” “lateral,” “up,” and “down” can refer to the relative orientation or position of a feature in a waveguide taking into account the orientation shown in the figures. For example, “up” or “topmost” can refer to a feature positioned closer to the top of the page than another feature. However, these terms should be interpreted broadly to include waveguides with other orientations, such as inverted or tilted orientations, where top / bottom, above / below, above / below, up / down, left / right, and far / near can be interchanged depending on the orientation. Furthermore, for ease of reference, the same reference numerals are used throughout this disclosure to identify similar or related components or features, but the use of the same reference numerals does not imply that these features should be interpreted as identical. In fact, in many examples described herein, features with the same number have multiple embodiments that differ from each other in structure and / or function. Additionally, the same shading can be used to indicate materials with similar composition in cross-section, but the use of the same shading does not imply that the materials should be interpreted as identical unless specifically indicated herein.

[0049] The following are examples of non-limiting embodiments of this technology.

[0050] 1. An acoustic waveguide, comprising:

[0051] The housing has a proximal end with an inlet port and a distal end with an outlet port;

[0052] A mounting flange, which is located at the proximal end and configured to acoustically couple the driver to the inlet bore; and

[0053] Multiple channels extend through the housing and acoustically couple the inlet port to the outlet port, each channel at least partially defining a sound path having an acoustic length, wherein at least one of the sound paths of the multiple channels has a bending angle of more than 180 degrees.

[0054] 2. The acoustic waveguide according to Example 1, wherein the driver is a high-frequency driver with an output frequency greater than 500 Hz.

[0055] 3. The acoustic waveguide according to Example 1 or 2, wherein the acoustic length of each sound path of the plurality of channels is substantially equal to that of each other sound path.

[0056] 4. The acoustic waveguide according to any one of Examples 1-3 further includes a plurality of entrance channels disposed between the entrance aperture and the plurality of channels and acoustically coupled to the entrance aperture and the plurality of channels, wherein the entrance channels divide the entrance aperture into at least two sound paths.

[0057] 5. The acoustic waveguide according to Example 4, wherein the plurality of channels includes a main channel, wherein the acoustic waveguide further includes a plurality of subchannels disposed between the entrance channel and the main channel and acoustically coupled to the entrance channel and the main channel, and wherein the subchannels divide each of the entrance channel into at least two sound paths.

[0058] 6. The acoustic waveguide according to Example 5, wherein each of the sub-channels changes the direction of the corresponding sound path within a range of approximately 70° to 90° from a direction perpendicular to the mounting flange.

[0059] 7. The acoustic waveguide according to Example 5 or 6, wherein the plurality of main channels divide each of the secondary channels into at least two sound paths.

[0060] 8. The acoustic waveguide according to any one of Examples 1-7, wherein the housing further includes a distal mounting flange configured to couple the acoustic waveguide to the speaker housing.

[0061] 9. The acoustic waveguide according to any one of Examples 1-8, wherein the housing further includes an upper portion and a lower portion capable of being coupled together in a clamshell configuration.

[0062] 10. The acoustic waveguide according to any one of Examples 1-9, wherein at least one of the sound paths of the plurality of main channels has a bending radius in the range of approximately 0.25 inches to 0.8 inches.

[0063] 11. The acoustic waveguide according to any one of Examples 1-10, wherein the outlet aperture is divided such that each of the plurality of channels is acoustically coupled to a separate portion of the outlet aperture.

[0064] 12. The acoustic waveguide according to any one of Examples 1-11, wherein the ratio of the depth of the housing to the width of the outlet aperture is in the range of about 1:1.2 to 1:2, in the range of about 1:1.4 to 1:1.8, about 1:1.44, or about 1:1.73.

[0065] 13. The acoustic waveguide according to any one of Examples 1-12, wherein the acoustic length of the channel is between approximately 120% and 200% of the depth of the housing, between approximately 130% and 145% of the depth of the housing, between approximately 138% and 141% of the depth of the housing, approximately 139.6% of the depth of the housing, or approximately 136.7% of the depth of the housing.

[0066] 14. The acoustic waveguide according to any one of Examples 1-13, wherein the acoustic waveguide is mirror-symmetric about a plane perpendicular to the surface of the mounting flange that divides the inlet orifice in two, and wherein the plane is vertically arranged such that the vector of the width across the acoustic waveguide is orthogonal to the plane.

[0067] 15. The acoustic waveguide according to any one of Examples 1-14, wherein at least a portion of the main channel extends laterally and / or vertically outward to the distal end downstream of the curved region.

[0068] 16. The acoustic waveguide according to Example 15, wherein the lateral opening of the main channel is defined at the distal portion of the main channel at an opening angle between approximately 10° and 20°, between approximately 12° and 18°, or between approximately 14° and 16°.

[0069] 17. The acoustic waveguide according to Example 15 or 16, wherein the vertical opening of the main channel defines a vertical opening surface, the vertical opening surface being configured to provide an acoustic dispersion pattern having an angle in the range of approximately 30° to 130°, an angle of approximately 105°, or an angle of approximately 90°.

[0070] 18. The acoustic waveguide according to Examples 1-14, wherein a first axis orthogonal to the mounting surface forms an angle of 0° to 90° relative to a second axis orthogonal to the distal end of the housing having the outlet hole.

[0071] 19. The acoustic waveguide according to Examples 1-14 further includes at least one compression driver connected to the mounting flange and configured to generate sound and direct the sound into the inlet orifice.

[0072] 20. The acoustic waveguide according to Examples 1-14, wherein each sound path is an arcuate path defined by at least one bend having a radius of curvature and a path width at the at least one bend, wherein the radius of curvature is equal to or greater than twice the path width at the bend.

[0073] 21. An acoustic waveguide, comprising:

[0074] The housing has a proximal end with a first inlet hole and a second inlet hole, and a distal end with a first outlet hole and a second outlet hole.

[0075] A first mounting flange is disposed at the proximal end and configured to acoustically couple the first actuator to the first inlet port;

[0076] A second mounting flange is disposed at the proximal end and configured to acoustically couple the second actuator to the second inlet bore;

[0077] Multiple first channels, extending through the housing and acoustically coupling the first inlet aperture to the first outlet aperture; and

[0078] Multiple second channels extend through the housing and acoustically couple the second inlet port to the second outlet port.

[0079] Each of the plurality of first and second channels at least partially defines a sound path having an acoustic length substantially equal to that of each of the other sound paths.

[0080] 22. The acoustic waveguide according to Example 21, wherein at least one of the first driver and the second driver is a high-frequency driver having an output frequency greater than 500 Hz.

[0081] 23. The acoustic waveguide according to Example 21 or 22, wherein at least one of the sound paths of the plurality of first channels has a bending angle of more than 180 degrees.

[0082] 24. The acoustic waveguide according to Example 21 or 22, wherein at least one of the sound paths of the plurality of second channels has a bending angle of more than 180 degrees.

[0083] 25. The acoustic waveguide according to any one of Examples 21-24 further includes a plurality of first entrance channels disposed between the first entrance aperture and the plurality of first channels and acoustically coupled to the first entrance aperture and the plurality of first channels, wherein the first entrance channels divide the first entrance aperture into at least two sound paths.

[0084] 26. The acoustic waveguide according to any one of Examples 21-25 further includes a plurality of second entrance channels disposed between the second entrance aperture and the plurality of second channels and acoustically coupled to the second entrance aperture and the plurality of second channels, wherein the second entrance channels divide the second entrance aperture into at least two sound paths.

[0085] 27. The acoustic waveguide according to Example 25 or 26, wherein at least one of the first and second inlet channels changes the direction of the corresponding sound path from a direction perpendicular to the corresponding first or second mounting flange in a range of approximately 70° to 90°.

[0086] 28. The acoustic waveguide according to any one of Examples 25-27, wherein the plurality of first channels and second channels respectively divide each of the first channel and the second channel into at least two sound paths.

[0087] 29. The acoustic waveguide according to any one of Examples 21-28, wherein the housing further includes a distal mounting flange configured to couple the acoustic waveguide to a speaker housing.

[0088] 30. The acoustic waveguide according to any one of Examples 21-29, wherein the housing further includes an upper portion and a lower portion capable of being coupled together in a clamshell configuration.

[0089] 31. The acoustic waveguide according to any one of Examples 21-30, wherein at least one of the sound paths of the plurality of first and second channels has a bending radius in the range of about 0.25 inches to 0.8 inches.

[0090] 32. The acoustic waveguide according to any one of Examples 21-31, wherein the outlet aperture is divided into separate portions such that each of the plurality of channels is acoustically coupled to a separate portion of the outlet aperture.

[0091] 33. The acoustic waveguide according to any one of Examples 21-32, wherein the ratio of the depth of the housing to the width of the outlet aperture is in the range of about 1:1.2 to 1:2, in the range of about 1.4 to 1:1.8, about 1:1.44, or about 1:1.73.

[0092] 34. The acoustic waveguide according to any one of Examples 21-33, wherein the acoustic length of the channel is between approximately 120% and 200% of the depth of the housing, between approximately 130% and 145% of the depth of the housing, between approximately 138% and 141% of the depth of the housing, approximately 139.6% of the depth of the housing, or approximately 136.7% of the depth of the housing.

[0093] 35. The acoustic waveguide according to any one of Examples 21-34, wherein the acoustic waveguide is mirror-symmetric about a plane perpendicular to the surface of the mounting flange that divides the inlet orifice in two, and wherein the plane is vertically arranged such that the vector of the width across the acoustic waveguide is orthogonal to the plane.

[0094] 36. The acoustic waveguide according to any one of Examples 21-35, wherein at least a portion of the first and second channels extend laterally and / or vertically outward to the distal end downstream of the curved region.

[0095] 37. The acoustic waveguide according to Example 36, wherein the lateral opening of the first and second channels defines an opening angle at the distal portions of the first and second channels between approximately 10° and 20°, between approximately 12° and 18°, or between approximately 14° and 16°.

[0096] 38. The acoustic waveguide according to Example 36 or 37, wherein the vertical opening of the first and second channels defines a vertically opening surface, the vertically opening surface being configured to provide an acoustic dispersion pattern having an angle in the range of approximately 30° to 130°, an angle of approximately 105°, or an angle of approximately 90°.

[0097] 39. The acoustic waveguide according to Examples 21-35, wherein a first axis orthogonal to the mounting surface forms an angle of 0° to 90° relative to a second axis orthogonal to the distal end of the housing having the outlet hole.

[0098] 40. The acoustic waveguide according to Examples 21-35 further includes at least one compression driver connected to the mounting flange and configured to generate sound and direct the sound into the inlet orifice.

[0099] 41. The acoustic waveguide according to Examples 21-35, wherein each sound path is an arcuate path defined by at least one bend having a radius of curvature and a path width at the at least one bend, wherein the radius of curvature is equal to or greater than twice the path width at the bend.

[0100] The foregoing disclosure may also refer to quantities and numbers. Unless otherwise specified, these quantities and numbers should not be considered limiting, but rather examples of possible quantities or numbers associated with the new technology. Furthermore, in this respect, the term "multiple" may be used to refer to quantities or numbers. In this respect, the term "multiple" means any number more than one, such as two, three, four, five, etc. For the purposes of this disclosure, the phrase "at least one of A, B, and C," for example, meaning (A), (B), (C), (A and B), (A and C), (B and C), or (A, B, and C), includes all further possible permutations when more than three elements are listed.

[0101] As should be understood from the foregoing, specific embodiments of the new technology have been described herein for illustrative purposes, but various modifications may be made without departing from this disclosure. Therefore, the invention is not limited to the appended claims. Furthermore, certain aspects of the new technology described in the context of specific embodiments may be combined or eliminated in other embodiments. Moreover, although advantages associated with certain embodiments of the new technology have been described in the context of those embodiments, other embodiments may also exhibit such advantages, and not all embodiments must exhibit such advantages to fall within the scope of this disclosure. Therefore, this disclosure and associated technologies may cover other embodiments not explicitly shown or described herein.

Claims

1. An acoustic waveguide, comprising: A housing having a proximal end with an inlet aperture and a distal end with an outlet aperture, wherein the depth of the acoustic waveguide is the distance between the proximal end and the distal end; A mounting flange is positioned at the proximal end and configured to acoustically couple the driver to the inlet bore; and Multiple sound channels extending through the housing and acoustically coupling the inlet port to the outlet port, each sound channel defining a sound path having an acoustic length, wherein each of the sound paths of the multiple sound channels includes an arcuate bend, and wherein the acoustic length of each sound path of the multiple sound channels is substantially equal to that of each other sound path; The acoustic waveguide further includes a plurality of inlet channels, which are disposed between the inlet aperture and the plurality of channels and acoustically coupled to the inlet aperture and the plurality of channels, wherein the inlet channels divide the inlet aperture into at least two sound paths, and wherein the plurality of channels include a plurality of main channels; The acoustic waveguide further includes a plurality of sub-channels, which are disposed between the entrance channel and the plurality of main channels and acoustically coupled to the entrance channel and the plurality of main channels, wherein the sub-channels divide each of the entrance channel into at least two sound paths; and Each of the main channels includes an open portion downstream of the bow-shaped bend, wherein each open portion has an open surface, and wherein the depth of the open portion of the plurality of main channels is between approximately 80% and 87% of the depth of the acoustic waveguide.

2. The acoustic waveguide according to claim 1, wherein, Each of the sub-channels changes the direction of the corresponding sound path within a range of approximately 70° to 90° from the direction perpendicular to the mounting flange.

3. The acoustic waveguide according to claim 1, wherein, The plurality of main channels divide each of the sub-channels into at least two sound paths.

4. The acoustic waveguide according to claim 1, wherein, At least one of the sound paths of the plurality of main channels has a radius of curvature in the range of approximately 0.25 inches to 0.8 inches.

5. The acoustic waveguide according to claim 1, wherein, The outlet aperture is divided into separate portions such that each of the plurality of main channels is acoustically coupled to a separate portion of the outlet aperture.

6. The acoustic waveguide according to claim 1, wherein, The acoustic waveguide is mirror-symmetric about a plane perpendicular to the surface of the mounting flange that divides the inlet orifice in two, and wherein the plane is vertically arranged such that a vector across the width of the acoustic waveguide is orthogonal to the plane.

7. The acoustic waveguide according to claim 1, wherein, The open portion of each of the plurality of main channels extends laterally and / or vertically outward from the curved region to the distal end, wherein the lateral opening of each of the plurality of main channels is defined at the distal portion of the plurality of main channels at an opening angle between approximately 10° and 20°, between approximately 12° and 18°, or between approximately 14° and 16°.

8. The acoustic waveguide of claim 1, wherein each sound path is an arcuate path defined by at least one bend having a radius of curvature and having a path width at the at least one bend, wherein the radius of curvature is equal to or greater than twice the path width at the bend.

9. The acoustic waveguide according to claim 1, wherein, The inlet hole of the housing is a first inlet hole of the housing, and the housing has a second inlet hole; the outlet hole is a first outlet hole and the distal end has a second outlet hole. The driver is a first driver, and the mounting flange is a first mounting flange configured to acoustically couple the first driver to the first inlet port; The second mounting flange is located at the proximal end and configured to acoustically couple the second driver to the second inlet port; The plurality of channels includes a plurality of first channels that extend through the housing and acoustically couple the first inlet port to the first outlet port; and Multiple second channels extend through the housing and acoustically couple the second inlet port to the second outlet port. Each of the plurality of first and second channels has a curved region at a midpoint along the channel and an open portion downstream of the curved region and extending from the curved region to the outlet hole, wherein the open portion extends between approximately 80% and 87% of the depth of the housing.

10. The acoustic waveguide according to claim 9, wherein, The ratio of the depth of the housing to the width of the outlet hole is in the range of approximately 1:1.2 to 1:2, in the range of approximately 1.4 to 1:1.8, approximately 1:1.44, or approximately 1:1.

73.

11. The acoustic waveguide according to claim 9, wherein, The acoustic length of the channel is between approximately 120% and 200% of the depth of the housing, between approximately 130% and 145% of the depth of the housing, between approximately 138% and 141% of the depth of the housing, approximately 139.6% of the depth of the housing, or approximately 136.7% of the depth of the housing.

12. The acoustic waveguide of claim 1, further comprising at least one compression driver connected to the mounting flange and configured to generate sound and direct the sound into the inlet orifice.

13. The acoustic waveguide of claim 1, wherein the lateral opening portion of each of the plurality of main channels extends for 57% to 73% of the total length of the sound path of the respective main channel.

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