A coil horn

Abstract

The utility model discloses a kind of coil loudspeakers. The loudspeaker is sequentially sleeved and concentrically arranged from inside to outside by dome tweeter, annular midrange loudspeaker, annular woofer, and three-way unit;Among them, the tweeter adopts dome diaphragm, the midrange loudspeaker adopts first annular diaphragm, and the woofer adopts second annular diaphragm;The three-way unit is used for dividing audio signal into high-frequency band, mid-frequency band and low-frequency band, and inputting into corresponding loudspeaker respectively. The utility model adopts three loudspeaker units of high-frequency, mid-frequency and low-frequency, and is concentrically sleeved from inside to outside. The tweeter unit selects dome diaphragm, and directivity is accurate and high-frequency extension performance is superior. The midrange unit is equipped with annular diaphragm, effectively suppresses segmented vibration, and ensures the intelligibility and purity of mid-frequency tone color. The woofer unit also adopts annular diaphragm, which can maximize the effective radiation area in limited space.

Description

Technical Field

[0001] This utility model relates to the field of coil speaker technology, and in particular to a coil speaker. Background Technology

[0002] While full-range speakers offer some versatility in traditional audio playback devices, they often have significant shortcomings. They typically require some sacrifice in the bass or treble range, making it difficult to perfectly reproduce sound details across a wide frequency range simultaneously. This results in an overall less complete and realistic listening experience.

[0003] In terms of sound quality, traditional full-range speakers have significant design limitations. They cannot achieve balanced and high-quality audio output across the entire frequency range, often requiring trade-offs in either bass or treble frequencies. This results in incomplete sound quality, failing to provide users with a truly authentic and pure listening experience. For example, when playing symphonic music, the bass may lack depth and power, while the treble may lack crispness and brightness, significantly diminishing the music's layering and detail.

[0004] In terms of space utilization, traditional speaker designs often struggle to balance performance and size. On one hand, to ensure a certain level of sound quality, traditional speakers often require a large volume to accommodate the sound-producing unit and related components. This severely limits their installation and application in space-constrained devices, such as small mobile devices or compact audio systems. On the other hand, even increasing the speaker's size makes it difficult to achieve a significant improvement in sound quality within a limited sound-producing area, and it also occupies more space, leading to an increase in the overall size of the device, which is detrimental to the miniaturization and portability of devices.

[0005] In terms of the accuracy of audio reproduction, traditional full-range speakers lack an effective crossover filtering mechanism, which can easily lead to interference and distortion between different frequency bands during operation. This causes the output sound to deviate from the characteristics of the original audio, making it impossible to accurately reproduce the original sound and affecting the listener's true experience of the original audio.

[0006] Regarding adaptability to diverse application scenarios, with the development of technology and the diversification of people's needs, audio equipment needs to be suitable for various different usage scenarios, including but not limited to high-fidelity audio systems, mobile portable devices, smart home audio systems, and car audio systems. Due to its inherent performance limitations, traditional full-range speakers are unable to meet the diverse requirements of these different scenarios in terms of audio quality, size, and space utilization, thus limiting their widespread application and promotion in the market. Utility Model Content

[0007] In view of this, the purpose of this utility model is to provide a coil speaker that can solve at least one of the technical problems mentioned in the background art.

[0008] According to one aspect of the present invention, a coil speaker is provided, comprising a dome tweeter, a ring midrange horn, a ring woofer, and a three-way unit arranged concentrically from the inside out.

[0009] The tweeter uses a dome diaphragm, the midrange speaker uses a first annular diaphragm, and the woofer uses a second annular diaphragm. The dome diaphragm, the first annular diaphragm, and the first annular diaphragm are driven by a first voice coil, a second voice coil, and a third voice coil, respectively. The size of the first voice coil is smaller than that of the second voice coil, and the size of the second voice coil is smaller than that of the third voice coil.

[0010] The three-way crossover unit is used to divide the audio signal into high-frequency, mid-frequency, and low-frequency bands, and input them to the corresponding speakers respectively.

[0011] In the above technical solution, three speaker units—a tweeter (dome), a midrange driver (ring), and a woofer (ring)—are concentrically arranged from the inside out. The tweeter uses a dome diaphragm, which is highly accurate in its directivity and has excellent high-frequency extension, allowing for delicate reproduction of high-frequency details. The midrange driver is equipped with a ring diaphragm, effectively suppressing split vibrations and ensuring the clarity and purity of the midrange timbre. The woofer also uses a ring diaphragm, maximizing the effective radiation area within a limited space and providing a solid foundation for bass performance. The three-way crossover unit integrates electronic crossover functionality, precisely dividing the input signal into high, mid, and low frequency bands, and driving the corresponding speaker units respectively, ensuring accurate reproduction of sound in each frequency band.

[0012] This design offers significant advantages. The concentric structure brings the acoustic centers of the high, mid, and low frequencies as close as possible, even coinciding, significantly improving phase consistency. Sounds of different frequencies are emitted almost synchronously, with negligible time differences in arrival at the ear. Even off-axis, the sound spectrum remains balanced, enhancing sound cohesion and providing precise and clear positioning of instruments and vocals. Interference between sound waves emitted by different units in space is effectively suppressed, reducing sound distortion and interference.

[0013] Compared to traditional side-by-side layouts, nested structures offer greater space utilization, enabling more compact speaker designs and making them suitable for space-constrained environments. The ring-shaped structure of the midrange diaphragm outperforms traditional cone structures in suppressing split-wave vibrations, thus reducing mid-frequency distortion and improving sound clarity. Simultaneously, the geometric characteristics of the ring edge result in a smoother high-frequency roll-off, leading to a more natural and fluid transition with the tweeter.

[0014] Because the speakers employ a concentric nesting design, sound diffuses evenly outwards from the center, creating an ideal point-source radiation pattern. This pattern ensures uniform sound wave propagation in all directions, effectively reducing interference and reflection differences during sound propagation. Listeners in different locations can enjoy a relatively consistent sound experience. High, mid, and low frequencies propagate synchronously outwards from the center point, resulting in a more uniform sound field coverage. Loudness and frequency response remain stable across different areas of the room, without significant fluctuations, significantly improving sound field uniformity and creating an immersive listening atmosphere. The concentric nesting speaker design ensures good phase consistency among the speaker units. Sharing a common sound center synchronizes the propagation of different frequency sound waves, avoiding phase differences caused by positional variations and significantly reducing sound wave interference and cancellation. High, mid, and low frequencies blend naturally, forming a complete and coherent sound. During listening, the transitions between different frequency bands are smooth and natural, without noticeable separation or disharmony, significantly enhancing the realism and detail of the sound quality.

[0015] Furthermore, the concentric nested speaker structure significantly improves sound positioning accuracy. Sound emanating from the center point allows listeners to perceive the sound source location more precisely, which is crucial for music appreciation and movie watching. For example, in symphonic music appreciation, the position of different instruments and performance details can be clearly distinguished. The concentric nested design allows three speakers to achieve omnidirectional sound coverage within a relatively small volume, making it suitable for space-constrained environments such as home theaters, small conference rooms, and car audio systems. It effectively saves installation space while maintaining sound quality. Simultaneously, the concentric nested speakers exhibit excellent synchronization during vibration. When an audio signal is input, the diaphragms of the dome tweeter, ring midrange driver, and ring woofer vibrate according to a specific pattern and phase relationship under the drive of their voice coils. This synchronized vibration enhances the coherence and integrity of the sound, reducing distortion caused by uncoordinated vibrations. Each speaker unit operates at its optimal working condition with minimal mutual interference, ensuring sound purity and high-quality output.

[0016] In some embodiments, the dome diaphragm, the first annular diaphragm, and the second annular diaphragm are driven by a first voice coil, a second voice coil, and a third voice coil, respectively, wherein the size of the first voice coil is smaller than that of the second voice coil, and the size of the second voice coil is smaller than that of the third voice coil.

[0017] The aforementioned technical solution aims to address the issues of vibration transmission and driving efficiency under spatial constraints in the main design. In the concentric structure, the large-amplitude vibration of the woofer is easily transmitted to the midrange and tweeter units through mechanical coupling, causing parasitic vibrations (intermodulation distortion) in the latter. Using incrementally increasing voice coil sizes (small for tweeters, medium for midranges, and large for woofers) is a targeted solution. The small tweeter voice coil is lightweight, has high acceleration, and is suitable for fast high-frequency response. More importantly, its small size and light weight make it less sensitive to vibration interference from the woofer (low inertia, not easily driven), and it occupies less radial space, leaving room for the inner structure. The large woofer voice coil provides powerful driving force and linear stroke, driving the large diaphragm to push air. Its larger mass and stronger magnetic circuit system also make it more stable, less susceptible to interference from other units (although the inner unit vibrates less), and help absorb some of the transmitted vibration energy. This differentiated driving design is a way to minimize intermodulation distortion and optimize the driving efficiency of each unit within a limited space while sharing a mechanical structure.

[0018] In the high-frequency range, a small voice coil is used in conjunction with a lightweight dome diaphragm. The lightweight design of the small voice coil significantly reduces inertia, enabling it to respond quickly to high-frequency vibrations (frequency > 2kHz). This design makes the tweeter highly sensitive to minute changes in high-frequency signals and achieves excellent high-frequency extension and transient response. In the mid-frequency range, a moderately sized voice coil is used to achieve an optimal balance between mass, driving force, and vibration controllability. This design meets the energy and vibration amplitude requirements of the mid-frequency range (approximately 300Hz to 3kHz), ensuring clarity and emotional expression in the mid-frequency sound. Furthermore, the lightweight nature of the ring diaphragm further improves the driving efficiency of the midrange driver. In the low-frequency range, a large voice coil is used to carry a larger current and generate a stronger magnetic driving force (BL value), thereby effectively driving the larger mass ring diaphragm in a long-stroke motion (frequency < 300Hz) to produce sufficient sound pressure level and low-frequency energy. The large voice coil also has better heat dissipation performance, helping to maintain the stability of the woofer under high power output. Specifically:

[0019] The first voice coil connected to the dome diaphragm is the smallest in size. This design allows the first voice coil to respond quickly and accurately to minute electrical signals in the high-frequency range. In the concentric nested speaker structure, the tweeter is responsible for the high-frequency range, and high-frequency signals typically have a faster rate of change and higher frequency. The smaller voice coil maintains better linear motion during high-frequency vibration, avoiding vibration hysteresis or distortion caused by excessive voice coil mass, thus ensuring the clarity and detail of the high frequencies. For example, when playing the high register of a piano or the overtones of a violin, it can accurately reproduce the agility and penetration of the sound. In addition, the smaller voice coil is lighter and experiences relatively less inertial force during vibration, thus maintaining higher vibration stability and accuracy. This reduces the risk of tweeter failure during operation, improves its reliability and lifespan, and ensures stable output of high-quality high frequencies in various audio scenarios.

[0020] The second voice coil corresponding to the first annular diaphragm is of moderate size. This aligns with the characteristics of the mid-range frequency band. The mid-range is the frequency band to which the human ear is most sensitive, mainly containing vocals and the main melody of most instruments. A moderately sized voice coil can maintain a relatively stable vibration state while ensuring sufficient driving force, allowing the midrange speaker to accurately reproduce the details and emotions of mid-range sound. In a concentric nested speaker system, the midrange speaker is positioned between the tweeter and woofer, and its balanced vibration characteristics help to neutralize the sharpness of the treble and the richness of the bass, making the overall sound more natural and harmonious. The moderately sized voice coil also maintains good thermal and mechanical stability at different volume and frequency levels, reducing damage caused by overheating or excessive vibration.

[0021] The third voice coil, connected to the second annular diaphragm, is the largest. This gives the woofer powerful driving force, capable of pushing a large volume of air to generate strong low-frequency sound pressure. The bass frequencies are typically low, requiring significant diaphragm displacement and strong driving force to achieve good low-frequency performance. A larger voice coil provides sufficient power to drive the woofer diaphragm to vibrate significantly, meeting the woofer's requirements for low-frequency reproduction. In the concentric nested structure, the woofer is located on the outermost layer, and the low-frequency sound waves it generates add depth and immersion to the overall sound. Furthermore, a larger voice coil typically has better heat dissipation and mechanical strength, able to withstand prolonged operation of the woofer at high power output, reducing the risk of voice coil burnout or deformation. This is crucial for ensuring the long-term stable operation of the entire speaker system.

[0022] Furthermore, the concentric nested speaker structure exhibits significant advantages in sound wave radiation characteristics. The smaller first voice coil-driven dome diaphragm, when vibrating, has a relatively smaller radiation angle, allowing for better control of the tweeter's directivity. In a concentric nested speaker, the tweeter is centrally located; through precise directivity control, the tweeter sound can be concentrated near the central axis, organically combining with the sound waves from the midrange and woofers in space. This prevents premature reflection and scattering of the tweeter during diffusion, thus maintaining the purity and clarity of the tweeter, allowing it to reach the listener's ears more accurately, and enhancing the sound's layering and three-dimensionality.

[0023] In some embodiments, the inner diameter of the first annular diaphragm is ≥ 2 times the diameter of the dome diaphragm, and the opening ratio of the second annular diaphragm is > 30%.

[0024] The above technical solution aims to solve the problems of acoustic interference (obstruction) and airflow blockage in the main solution, and is a core solution directly addressing the sound wave path problem of concentric stacking. The first annular diaphragm inner diameter is ≥ 2 times the dome diaphragm diameter: This ensures that the sound waves emitted by the tweeter (dome) have a sufficiently large unobstructed channel to pass through the central hole of the midrange diaphragm. If the midrange inner diameter is too small, it will severely obstruct and reflect the high-frequency sound waves, leading to high-frequency attenuation, blurred sound image, and poor directivity. 2 times the diameter is a key geometric parameter to ensure smooth sound wave passage. The second annular diaphragm aperture ratio is > 30%: The woofer is located on the outermost layer, and its diaphragm back is a closed cavity. During operation, the diaphragm moves inward to compress the air in the cavity and moves outward to expand the cavity. The aperture allows airflow, reduces back cavity pressure, improves efficiency, and reduces nonlinear distortion (especially at large amplitudes). An aperture ratio of > 30% is a threshold to ensure smooth airflow, reduce turbulence noise, and minimize power compression. In a concentric structure, the inner drivers (tweeter and midrange) and their supports obstruct airflow behind the bass diaphragm. Therefore, a sufficiently high opening ratio is crucial to overcome the airflow blockage caused by the concentric structure. Specifically:

[0025] The purpose of having an inner diameter of at least twice the diameter of the tweeter diaphragm is to reduce acoustic obstruction and diffraction, ensuring that the tweeter's sound waves (especially in the mid-high frequencies) can radiate unimpeded into the space in front, avoiding obstruction or reflection by the inner edge of the midrange diaphragm, which would lead to narrowed high-frequency directivity, degraded off-axis response, or acoustic interference. This is equivalent to creating a physical "waveguide" environment for the tweeter, with the inner edge acting as a sound wave inlet, optimizing high-frequency diffusion. The purpose of having an aperture ratio of >30% for the woofer diaphragm is to ensure rearward acoustic radiation from the midrange driver. The aperture allows sound waves from behind the midrange driver to penetrate the woofer diaphragm and radiate forward, preventing the rear cavity of the midrange driver from being completely sealed off (otherwise, a high-Q resonant cavity would be formed, leading to mid-frequency peak-valley distortion). This is equivalent to designing the woofer diaphragm as an acoustically semi-transparent baffle, solving the problem of acoustic obstruction of the inner units by the outermost unit in a nested structure.

[0026] In some embodiments, the dome diaphragm has a double curvature profile, and the ratio of the radius of curvature of the central region to the radius of curvature of the edge region is 2.5 to 3.5:1.

[0027] In the above technical solution, the aim is to address the issues of directivity control (especially in conjunction with midrange) and high-frequency clarity (reducing diffraction) in the main solution. The tweeter, located at the very center, directly affects the overall directivity due to its sound wave radiation pattern and needs to smoothly connect with the surrounding midrange unit. A flatter central area (larger radius of curvature) in the hyperbolic profile is beneficial for high-frequency extension and detail; a steeper edge area (smaller radius of curvature) helps control the sound wave diffusion angle (directivity), allowing for a smoother transition to the midrange unit's radiation range and reducing diffraction effects at the concentric interface (tweeter edge and midrange inner hole edge) (diffraction causes high-frequency peaks and valleys). The ratio range of 2.5–3.5:1 is optimized to balance high-frequency extension, off-axis response smoothness, and matching with the midrange unit's radiation. In the concentric structure, the overlap area between the tweeter's off-axis response and the midrange unit's axial response is more critical, requiring careful curvature design to ensure the consistent directivity of the entire stacked structure near the crossover point. Specifically:

[0028] The hyperbolic diaphragm design aims to extend high-frequency response and suppress split vibrations. Optimization of diaphragm performance is achieved by employing a structure with a small curvature (high radius) in the central region and a large curvature (gentle transition) in the edge region. The small curvature radius in the central region increases the first split vibration frequency, allowing the diaphragm to maintain a near-ideal piston motion state over a wider frequency band, while simultaneously enhancing the local stiffness of the central region and effectively reducing high-frequency distortion. The large curvature radius in the edge region helps reduce stress concentration at the edge folds, improves coupling with the suspension edge, and thus provides a smoother acoustic impedance transition, reducing high-frequency sound wave reflection and diffraction at the diaphragm edge. The ratio of the central region's curvature radius to the edge region's curvature radius is set within the range of 2.5 to 3.5:1. This ratio range is selected based on considerations of diaphragm performance. A ratio exceeding 3.5 may increase the risk of stress cracking; while a ratio below 2.5 may fail to adequately suppress split vibrations. Therefore, a ratio of 2.5 to 3.5:1 can effectively avoid stress cracking or insufficient suppression of segmented vibration caused by abrupt changes in curvature while strengthening the rigidity of the central area.

[0029] In some embodiments, the first annular diaphragm has a catenary curved surface profile, and the surface of the first annular diaphragm is provided with a Fresnel ring of varying depth; the edge is designed with at least a 12-sided chamfer.

[0030] The above technical solutions aim to address the concentric structure defects of the main solutions: vibration control (suppressing split vibration), sound wave diffusion optimization (reducing internal reflections / diffraction), and edge diffraction control (connecting with bass). The midrange unit, sandwiched between the treble and bass, is crucial to the overall clarity and coherence of the sound. The catenary curved profile has natural mechanical advantages (uniform tension), providing an optimal stiffness-to-weight ratio, effectively suppressing split vibrations (sensitive to the human ear in the mid-range) that are easily amplified under concentric structure constraints, and reducing distortion. The gradually deepening Fresnel band is essentially a microstructured phase plug designed on the diaphragm surface. Its function is to disperse the sound waves generated on the diaphragm surface, reducing internal reflections and standing waves that may be caused by the diaphragm itself as a large plane within the concentric cavity, optimizing the sound wave diffusion pattern, and improving mid-frequency clarity and localization. The circular diaphragm edge is changed to a dodecagon (or polygon). The core purpose is to break the perfect circular symmetry, because a perfect circular edge will produce strong, specific frequency diffraction peaks and valleys when sound waves radiate. In a concentric structure, the diffracted sound waves from the edge of the midrange diaphragm will cause complex interference with the sound waves radiated by the tweeter and woofer. The chamfered design effectively disperses the diffraction energy and smooths the frequency response curve, especially in the area where it connects with the woofer. Specifically:

[0031] The purpose of the catenary curved surface profile is to achieve uniform tensile stress across the entire domain, eliminate local stress concentration, and suppress radial segmentation vibration; it also achieves isochronism in the sound wave propagation path, improving phase consistency. It forms a continuous curvature transition with the tweeter hypercurvature diaphragm (continuous catenary curvature derivative), reducing mid-to-high frequency sound wave reflection. The purpose of the gradually deepening Fresnel ring band is to reduce weight by 30% (compared to a solid diaphragm), thereby improving transient response. The gradually changing ring band depth avoids fixed-period diffraction peaks and widens the frequency response flat region. The ring band edge inevitably induces high-frequency diffraction (>10kHz), therefore, a chamfer design is required for compensation. Further, a chamfered edge of at least 12 sides is adopted, i.e., the outer edge of the diaphragm is cut into at least 12 equal parts, forming a tiny sawtooth-shaped chamfer (chamfer depth ≈ 0.2mm); the purpose of this design is to disperse the Fresnel ring band diffracted sound waves, eliminate the 5-8kHz diffraction peak, and increase the effective length of the diaphragm edge, thereby reducing the Q value of segmentation vibration.

[0032] In some embodiments, the second annular diaphragm has a curved horn profile and is provided with a plurality of openings arranged radially, wherein the density of the inner openings is greater than the density of the outer openings.

[0033] In the above technical solutions, the aim is to address issues such as airflow obstruction / turbulence, low-frequency efficiency and radiation impedance matching, and reduced vibration transmission in the main solutions. The woofer is the outermost layer in the concentric structure, and its rear airflow environment is the most complex (obstructed by the inner structure). The curved horn profile (typically slightly concave in the center and upward-sloping at the edges) not only provides good rigidity but, more importantly, simulates the gradual change in acoustic impedance of a horn. It can more effectively couple diaphragm motion with free space, improving low-frequency radiation efficiency (especially within limited dimensions) and mitigating the adverse effects of the concentric structure's inner cavity on bass output. Radially arranged openings with a higher density on the inner side than the outer side achieve refined airflow management. The radial arrangement follows the radial flow direction of air during diaphragm movement, reducing turbulence. A higher density of openings on the inner side than the outer side results in the largest displacement and the greatest pressure change in the central region of the diaphragm. The high-density openings on the inner side can more effectively release airflow in high-pressure areas, significantly reducing wind noise and nonlinear distortion under high dynamic range. The relatively small displacement and pressure change in the outer region allow for a lower opening density while maintaining the structural strength of the diaphragm. This design largely overcomes the problem of concentric internal cavity obstructing bass airflow. Specifically:

[0034] The application of the curved horn profile aims to efficiently convert the piston motion of the diaphragm into a plane wave and effectively suppress edge diffraction. This design allows sound waves to radiate naturally along the curvature, thereby reducing interference from cabinet reflections. The design of the aperture density gradient compensates for the non-uniformity of air mass flow rate during diaphragm movement, thus reducing turbulent noise. The catenary surface, as a special curved shape, possesses excellent mechanical properties. When the first annular diaphragm adopts a catenary surface profile, its vibration exhibits higher stability and uniformity. Driven by the voice coil, the catenary surface effectively disperses the stress on the diaphragm, reducing stress concentration that may occur during vibration. This characteristic allows the diaphragm to maintain a consistent vibration mode under different frequencies and amplitudes, significantly improving the sound quality stability and reliability of the midrange speaker. Its unique geometry facilitates the smooth propagation and radiation of sound waves on the diaphragm surface, reducing the probability of sound wave reflection and interference on the diaphragm surface, thereby increasing the sound pressure level and sound propagation distance of the midrange speaker, making the midrange frequencies more prominent and clear in the sound field.

[0035] Gradual-depth Fresnel bands enable phase correction and sound wave diffusion control. Positioned on the surface of the first annular diaphragm, these bands adjust the phase of sound waves at different frequencies, helping to maintain phase or reduce phase difference during propagation. This significantly improves the directivity and coherence of the midrange speaker's sound radiation, making the midrange frequencies more focused and clear in the sound field. Furthermore, the gradual-depth Fresnel bands allow for precise control of sound wave diffusion. By scientifically designing the band depth and spacing, the midrange sound waves can diffuse systematically within a specific range, preventing excessive concentration or dispersion, thus creating a more uniform and natural sound field within the listening area and significantly enhancing the listener's experience. Simultaneously, the gradual-depth Fresnel bands exhibit differentiated reflection and diffraction effects on sound waves of different frequencies, optimizing the frequency response, enhancing specific frequencies, and suppressing others. This results in a flatter and more balanced frequency response for the midrange speaker, improving the sound quality of the midrange and making the sound more natural and realistic.

[0036] The at least 12-sided chamfered edge design excels at reducing sound wave diffraction and interference. When sound waves propagate to the diaphragm edge, the chamfered design allows for a smoother transition into the surrounding environment, effectively reducing stray sound waves caused by edge reflection and diffraction. This maintains the purity and clarity of midrange sound waves, ensuring accurate reproduction of sound details in complex sound fields. Simultaneously, the at least 12-sided chamfered design enhances the rigidity and strength of the diaphragm, making the diaphragm edge structure more stable and able to withstand greater vibration stress. This reduces the risk of deformation and damage to the diaphragm during high-volume or high-frequency vibrations, thereby increasing the lifespan and reliability of the first annular diaphragm and ensuring the midrange speaker maintains good sound quality over the long term. Furthermore, the at least 12-sided chamfered design optimizes the directionality of sound wave radiation, making the radiation more uniform and stable at the diaphragm edge. This better controls the diffusion range and directionality of sound waves, contributing to a more ideal sound field distribution within the listening area, allowing listeners to enjoy consistent midrange performance from different positions.

[0037] In some embodiments, the dome diaphragm is a titanium / ceramic coated silk composite dome.

[0038] The aforementioned technical solution aims to address the challenges of performance optimization, vibration control (resonance suppression), weight reduction (reducing intermodulation distortion), and thermal management (power handling) within the constraints of the main solution. In a very small space (center position), the diaphragm needs to be extremely lightweight (for rapid high-frequency response), extremely rigid (to suppress breakup vibrations), and have good damping (to absorb vibration energy and reduce its transmission to the midrange). A composite structure (silk matrix providing damping and toughness, titanium / ceramic coating providing rigidity and high-frequency extension) perfectly meets these requirements. Lightweight construction also reduces the likelihood of being affected by bass vibrations (reducing IMD). Specifically:

[0039] The high strength and lightweight properties of titanium provide the diaphragm with excellent rigidity, ensuring that it maintains a stable vibration mode during high-frequency vibrations. The ceramic coating further enhances the diaphragm's hardness and stability, enabling it to respond more quickly and accurately to changes in high-frequency signals. Meanwhile, silk, as the base material, provides the diaphragm with excellent damping characteristics due to its flexibility, effectively reducing resonance peaks and distortion during high-frequency vibrations, thereby improving high-frequency clarity and extension.

[0040] The titanium / ceramic coated silk composite dome tweeter boasts a wider frequency response range, covering a higher frequency spectrum, while exhibiting a flatter response in the mid-to-high frequency range. This allows the tweeter to more effectively reproduce high-frequency details and rich harmonic components in music, significantly enhancing the layering and stereoscopic effect of the sound, providing listeners with a richer and more nuanced auditory experience. The smooth surface and appropriate damping characteristics of the composite dome tweeter help reduce sound wave reflection and interference on the diaphragm surface. Sound waves can propagate more smoothly from the diaphragm surface, thereby reducing stray sound waves and significantly improving the purity and clarity of the sound waves. This is crucial for creating a clear and transparent sound field.

[0041] In some embodiments, the first annular diaphragm is an aramid / carbon fiber hybrid honeycomb sandwich diaphragm.

[0042] The aforementioned technical solution aims to address the challenges of performance optimization, vibration control (resonance suppression), weight reduction (reducing intermodulation distortion), and thermal management (power handling) within the constraints of the main solution. The midrange unit sandwiched in the middle requires extremely high rigidity and excellent damping to resist vibration transmission from the bass and suppress its own breakup vibration (sensitive to mid-frequency distortion). The honeycomb sandwich structure provides extremely high in-plane stiffness and excellent damping characteristics while maintaining lightweight construction. An aramid / carbon fiber hybrid surface further enhances rigidity and strength. This material combination is key to achieving high-fidelity midrange in a space-constrained concentric structure. Specifically:

[0043] The hybrid honeycomb sandwich diaphragm design of aramid and carbon fiber fully leverages the advantages of both materials. Aramid fiber, with its high strength and toughness, provides the diaphragm with excellent mechanical strength and resilience. Carbon fiber, with its high rigidity and low density, further enhances the diaphragm's rigidity while maintaining its lightweight nature. This material combination allows the first annular diaphragm to achieve extremely high rigidity while remaining lightweight. For midrange speakers, this balance between rigidity and lightweight is crucial, as they need to maintain stable vibration at relatively large amplitudes to accurately reproduce midrange sound. The lightweight diaphragm can quickly respond to changes in the midrange signal, while high rigidity reduces deformation during vibration, thereby improving sound clarity and accuracy.

[0044] Aramid fibers also possess excellent damping properties, effectively absorbing and dissipating vibrational energy, reducing resonance peaks and distortion during diaphragm vibration. This results in a purer, more natural sound from the midrange speaker, free from harshness or blurriness caused by resonance. The addition of carbon fiber further enhances the diaphragm's stability and resistance to deformation, allowing for better preservation of sound details. The high rigidity and lightweight characteristics of the aramid / carbon fiber hybrid honeycomb sandwich diaphragm enable it to cover a wider frequency range. In the mid-frequency range, it accurately reproduces the main melody of vocals and instruments, while also extending into parts of the high and low frequency ranges, better connecting with tweeters and woofers. This helps create a more complete and coherent sound field, allowing listeners to experience the richness and layering of the music. The honeycomb sandwich structure provides the diaphragm with excellent sound wave radiation efficiency. The air layers inside the honeycomb structure act as sound wave buffers and guides, allowing sound waves to propagate and radiate more evenly across the diaphragm surface. This helps increase the sound pressure level and propagation distance of the midrange speaker, making the midrange frequencies more prominent and clear in the sound field. Because the hybrid honeycomb sandwich diaphragm has a more stable and uniform vibration mode, it can produce a more consistent sound wave phase. This helps improve the phase consistency of the midrange speaker's sound wave radiation, allowing the midrange frequencies to blend better with other frequency bands in the sound field, reducing sound interference and distortion caused by phase differences.

[0045] In some embodiments, the second annular diaphragm is a basalt fiber reinforced PP diaphragm or a carbon fiber / foamed silicone sandwich diaphragm.

[0046] The above technical solution aims to address the challenges of performance optimization, vibration control (resonance suppression), weight reduction (reducing intermodulation distortion), and thermal management (power handling) within the constraints of the main solution. The outermost bass unit requires large displacement, high strength, high damping, and good thermal stability (voice coil heating). Basalt fiber reinforced PP provides good strength, toughness, and cost-effectiveness, suitable for large amplitude movements. Lightweighting helps reduce overall vibration energy transfer. In the carbon fiber / foamed silicone sandwich structure, carbon fiber provides extremely high rigidity and strength, while the foamed silicone core layer provides excellent damping and vibration isolation (actively absorbing its own vibration energy, reducing transmission to internal units), and silicone also has a certain degree of heat resistance. This is a high-end solution that pursues ultimate bass performance and minimizes vibration transmission within a concentric structure. Specifically:

[0047] Basalt fiber, with its high strength and high modulus, provides excellent rigidity to the diaphragm, ensuring it maintains a stable shape during low-frequency vibration and reducing deformation. Simultaneously, PP (polypropylene) material possesses appropriate damping characteristics, effectively absorbing and dissipating vibrational energy, reducing diaphragm resonance peaks and distortion. This balance between rigidity and damping allows the second ring diaphragm to provide clear and accurate sound reproduction in the low-frequency range. The low density of PP material results in a lighter overall diaphragm mass, enabling rapid response to changes in low-frequency signals and improving the transient response of bass. The lightweight diaphragm requires less driving force during vibration, improving the efficiency of the woofer and reducing the burden on the amplifier. Furthermore, basalt fiber has excellent heat resistance, maintaining stable performance in high-temperature environments. This means that during prolonged high-power playback, the second ring diaphragm's vibration characteristics and sound quality will not be affected by temperature changes, significantly improving the reliability and durability of the woofer.

[0048] Carbon fiber is renowned for its extremely high rigidity and strength, enabling the diaphragm to maintain a stable shape during low-frequency vibrations and reducing energy loss. Silicone foam, as the interlayer, not only possesses excellent elasticity and lightweight properties, reducing the overall diaphragm mass and allowing for rapid response to changes in low-frequency signals, but also improves the transient response and clarity of bass. Silicone foam also exhibits excellent damping properties, effectively absorbing and dissipating vibrational energy, reducing diaphragm resonance peaks and distortion. This results in a purer, more natural bass response, free from the blurring or booming sounds caused by resonance. The carbon fiber / silicone foam sandwich diaphragm structure enhances sound wave radiation efficiency. The high rigidity of carbon fiber ensures more uniform and efficient sound wave propagation on the diaphragm surface, while the elasticity of silicone foam allows sound waves to radiate more smoothly, reducing reflection and interference, thereby increasing the bass sound pressure level and propagation distance.

[0049] Whether it's a basalt fiber reinforced PP diaphragm or a carbon fiber / foamed silicone sandwich diaphragm, their high rigidity and lightweight characteristics enable the second ring diaphragm to achieve a wider frequency response and more accurate sound reproduction in the low-frequency range. Bass can extend into even lower frequency ranges while maintaining good clarity and detail, allowing listeners to feel the low-frequency energy and atmosphere in the music. The properties of these two diaphragm materials also help improve the control and directivity of bass sound waves. A high-rigidity diaphragm can more precisely control the direction of sound wave propagation, making the bass more focused and evenly distributed in the sound field, reducing sound wave dispersion and blurring, thereby enhancing the expressiveness and impact of the bass. At the same time, the damping properties of materials such as foamed silicone can reduce sound wave reflection and interference on the diaphragm surface, making the bass sound waves purer and more natural. This helps improve the layering and stereoscopic effect of the bass, allowing listeners to better perceive the position and shape of the bass in the sound field.

[0050] In some embodiments, the overlap region between the high-frequency curve and the mid-frequency curve of the coil speaker is 1.5kHz-3kHz, and the overlap region between the stacked area of ​​the mid-frequency curve and the low-frequency curve is 200Hz-500Hz.

[0051] The above technical solution directly addresses the most challenging acoustic problem in concentric stacking—crossover phase interference. The physical acoustic centers of the three units are not on the same plane, leading to a time difference (phase difference) in the arrival time of sound waves near the crossover point at the listening point. The design goal of the crossover network is to achieve an overlap of 1.5kHz-3kHz between the high-frequency and mid-frequency curves, and 200Hz-500Hz between the mid-frequency and low-frequency curves. Traditional steep crossover filters (such as 24dB / oct) in a concentric structure result in deeper "crossover valleys" due to phase issues. A wider overlap region (gradually decreasing slope) is intentionally designed to allow adjacent units to operate simultaneously across a wider frequency range. A wider overlap region provides space and possibilities for phase correction via the crossover network (e.g., using an all-pass filter) or compensation through physical location / waveguide design. Even with phase shifts, the gradual change in energy within the wider overlap region can mask the deep valleys or peaks caused by phase interference, achieving a smoother audible transition. The 1.5k-3kHz (high-mid) and 200-500Hz (mid-low) frequencies were chosen because these ranges respectively avoid the 2-4kHz range where the human ear is most sensitive (avoiding a deep valley in this range) and contain important mid-low frequency fundamentals. This is a crossover strategy specifically designed to overcome the phase problem caused by the misalignment of the physical acoustic centers of concentric structures. Specifically:

[0052] Within the 1.5kHz-3kHz frequency range, the high-frequency and mid-frequency curves overlap, a design that allows the high and mid frequencies to complement and blend each other in key frequency bands. Since the human ear is highly sensitive to this frequency range, which contains important frequency components of vocals and many instruments, the overlap ensures a smooth transition between high and mid frequencies, avoiding abrupt breaks or changes in sound, resulting in a more natural and coherent sound. This overlap enhances the detail and layering of the sound; the tweeter provides high-frequency detail and brightness, while the midrange speaker adds warmth and thickness. For example, when playing vocals, the tweeter clearly reproduces details such as the singer's sibilance and breath sounds, while the midrange speaker reproduces the main vocal parts, making the sound more three-dimensional and expressive. In the sound field, the overlap between high and mid frequencies helps improve the coherence and integrity of the sound field, allowing listeners to perceive a unified and coherent sound source, enhancing immersion and realism.

[0053] The 200Hz-500Hz frequency range is the transition zone between mid-range and low-range frequencies, where the mid-range and low-range curves overlap to some extent. This overlap ensures a smooth transition between the mid-range and low-range frequencies, avoiding gaps or dips in the mid-low frequency band. This frequency band includes the low-frequency harmonics of musical instruments and the low-frequency part of vocals; a smooth transition helps to restore the integrity and richness of the music. The overlapping area between mid-range and low-range frequencies enhances the thickness and warmth of the sound. Midrange speakers provide mid-range detail and warmth, while woofers supplement the low-range foundation and power. For example, when playing string instruments or vocals, the woofer enhances the low-frequency support, making the sound fuller and more textured. In the soundstage, the overlapping area between mid-range and low-range frequencies optimizes the balance of the soundstage, allowing the depth of the bass to complement the clarity of the midrange, improving the overall listening experience.

[0054] A well-defined overlap between high and mid frequencies, and between mid and low frequencies, significantly enhances the sound integration of a speaker system, making the audio spectrum more coherent and unified. Listeners are less likely to perceive differences between different speaker units, enjoying a complete and harmonious sound. This frequency curve overlap design improves the flexibility and adaptability of the speaker system, allowing it to better adapt and perform in different music genres and listening environments. For example, it highlights vocals and rhythm when playing pop music, and reproduces instrument details and layers when playing classical music. A well-defined frequency curve overlap optimizes crossover design and performance, making signal distribution and transition easier, reducing frequency response fluctuations and phase distortion near the crossover point, thereby improving the sound quality of the speaker system. Attached Figure Description

[0055] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0056] Figure 1 This is a schematic diagram of the structure of an embodiment of a coil speaker according to the present invention;

[0057] Figure 2 This is a three-dimensional exploded view of an embodiment of a coil horn according to this utility model;

[0058] Figure 3 This is a side exploded view of an embodiment of a coil horn according to the present invention;

[0059] Figure 4 This is an embodiment of a coil speaker according to the present invention. Figure 1 Schematic diagram of the AA section;

[0060] Figure 5 This is a schematic diagram of the frequency response curve of an embodiment of a coil speaker according to the present invention, wherein the left figure is a schematic diagram of the frequency response curve of this embodiment, and the right figure is a flat frequency response curve;

[0061] Figure 6 This is a schematic diagram of the audio signal processing flow of an embodiment of a coil speaker according to this utility model. Detailed Implementation

[0062] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are only for illustrating the present invention and do not limit the scope of the present invention. Similarly, the following embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0063] Example 1

[0064] Please see Figure 1 A coil speaker, comprising a dome tweeter 3, a ring midrange horn 2, and a ring woofer 1 arranged concentrically from the inside out, and a three-way unit 4 (see [reference needed]). Figure 2 );

[0065] Please refer to Figure 2 The tweeter 3 uses a dome diaphragm 31, the midrange speaker 2 uses a first annular diaphragm 21, and the woofer 1 uses a second annular diaphragm 11. The three-way crossover unit 4 is used to divide the audio signal into high-frequency, mid-frequency, and low-frequency segments, which are then input to their respective speakers. The figure also includes a first voice coil 32, a first washer 33, a first magnet 34, and a first support 35; a second voice coil 22, a second washer 23, a second magnet 24, and a second support 25; a third voice coil 12, a third washer 13, and a third magnet 14.

[0066] In this embodiment, the dome diaphragm 31, the first annular diaphragm 21, and the second annular diaphragm 11 are driven by the first voice coil 32, the second voice coil 22, and the third voice coil 12, respectively. The first voice coil 32 is smaller than the second voice coil 22, and the second voice coil 22 is smaller than the third voice coil 12.

[0067] For example, in a 10-inch woofer system (approximately 250mm diaphragm diameter), the voice coil size needs to be significantly increased to meet driving requirements, power handling, and heat dissipation needs. The following parameters are more in line with engineering practice:

[0068] Dome tweeter 3: Diaphragm: Dome diaphragm 31 (typical diameter: 25-35mm). Voice coil: First voice coil 32, diameter 20-28mm (common in high-performance dome tweeters). Reason: A 20-28mm voice coil can balance high-frequency response speed and power handling capacity.

[0069] Circular Midrange Speaker 2: Diaphragm: First circular diaphragm 21 (typical diameter: 80-130mm, such as 3-5 inch midrange). Voice Coil: Second voice coil 22, diameter 35-50mm. Rationale: To match the midrange diaphragm area, a larger voice coil is needed to provide sufficient driving force.

[0070] Ring woofer 1: Diaphragm: Second ring diaphragm 11 (10 inches, approximately 250mm). Voice coil: Third voice coil 12, diameter 65-100mm. Reasons: Driving force requirements: A large diaphragm requires a stronger magnetic field and a longer stroke to move air; a large voice coil provides greater driving force (BL value). Heat dissipation and power: The woofer unit handles the highest power; a large voice coil has a larger heat dissipation area, preventing burnout. Stroke control: A large-diameter voice coil can more stably control the long-stroke movement of the diaphragm, reducing distortion.

[0071] Table 1. Voice Coil Size Hierarchy (10-inch System)

[0072] unit Voice coil diameter relative size High 3 20-28mm Minimum (approximately 1 inch) Alto 2 35-50mm Medium (approximately 1.5-2 inches) Bass 1 65-100mm Maximum (approximately 2.5-4 inches)

[0073] In this embodiment, as an optional example (not shown in the figure), the inner diameter of the first annular diaphragm 21 is ≥ 2 times the diameter of the dome diaphragm 31, and the opening ratio of the second annular diaphragm 11 is > 30%. A preferred embodiment is as follows: the inner diameter of the first annular diaphragm 21 = 2.3 times the diameter of the dome diaphragm 31; the opening ratio of the second annular diaphragm 11 = 32%.

[0074] For example, still based on a 10-inch woofer system, the design benchmarks are as follows: Dome tweeter 3: diaphragm diameter 28mm (typical high-performance unit size); Ring midrange woofer 2: diaphragm inner diameter ≥ 2 × 28mm = 56mm (meets basic constraints); Ring woofer 1: 10-inch diaphragm (effective diameter 250mm), aperture ratio > 30%.

[0075] Table 2 Parameters of the Preferred Scheme

[0076]

[0077]

[0078] Structural Coordination Analysis

[0079] 1. Midrange-Treble Diaphragm Geometric Relationship (Inner Diameter = 2.3 times): High-frequency sound waves diffuse unimpeded at >110°; avoids edge diffraction of the midrange diaphragm, reducing distortion in the 2-5kHz critical frequency band by ≤0.5%.

[0080] 2. Bass diaphragm aperture ratio (32%) Topology: Honeycomb aperture array (aperture Φ3.5mm, spacing 5mm)

[0081] Table 3 shows the fluid dynamics optimization after the above settings:

[0082] parameter Closed-face diaphragm 32% Open-Pore Diaphragm Rear cavity airflow resistance high 42% reduction Segmented vibration distortion 1.8％ ≤1.2％ Q-value stability ±15％ ±7％

[0083] Table 4 Simulation results of transfer function response:

[0084] frequency band Traditional Design This plan >5kHz Attenuation slope -6dB / oct Flat extension up to 40kHz 300-5kHz Group latency 0.8ms ≤0.3ms <300Hz Harmonic distortion 5% ≤2% (90dB SPL)

[0085] Key points of project implementation

[0086] 1. Midrange diaphragm material: carbon fiber / glass fiber composite layer (0.2mm thickness) → maintaining structural rigidity with an inner diameter of 64.4mm.

[0087] 2. Bass aperture design: Laser precision cutting + silicone edge damping → suppresses local resonance caused by 32% aperture.

[0088] 3. Magnetic circuit system matching: Bass magnet: Double neodymium magnet (20mm thick) → driving a 75mm voice coil to provide 18T magnetic flux density.

[0089] 4. Conclusion: This example achieves the following in a 10-inch three-way system through a precise combination of a 2.3 times diameter-to-inner-diameter ratio and a 32% aperture ratio: no diffraction radiation in the high frequencies, a continuous transition in acoustic impedance between the mid and low frequencies, and efficient release of bass back pressure.

[0090] In this embodiment, as an optional example (not shown in the figure), the dome diaphragm 31 adopts a double curvature profile, and the ratio of the radius of curvature of the central region to the radius of curvature of the edge region is 2.5 to 3.5:1. A preferred embodiment is as follows: the ratio of the radius of curvature of the central region to the radius of curvature of the edge region is 3:1.

[0091] For example, still based on a 10-inch woofer system, the dome tweeter 3 is modified as follows:

[0092] Table 5. Parameters of Dome Tweeter

[0093]

[0094] In this embodiment, as an optional example (not shown in the figure), the first annular diaphragm 21 adopts a catenary curved surface profile, and the surface of the first annular diaphragm 21 is provided with a Fresnel ring with a gradually varying depth; the edge adopts a chamfered design of at least 12 sides.

[0095] For example, still based on a 10-inch woofer system, the ring midrange speaker 2 is modified as follows:

[0096] Table 6 Parameters of the Circular Midrange Speaker 2

[0097]

[0098] This design achieves a high-frequency diffraction loss of 0.45 dB / cm (compared to ≥1.2 dB / cm for traditional rounded edges) and a sound center alignment error of <λ / 20@10kHz (equivalent time difference of 0.006 ms).

[0099] In this embodiment, as an optional example (not shown in the figure), the second annular diaphragm 11 adopts a curved horn profile and is provided with a plurality of openings arranged radially, wherein the density of the inner openings is greater than the density of the outer openings.

[0100] For example, still based on a ten-inch woofer system, the ring woofer 1 is modified as follows:

[0101] Table 7 Parameters of Ring-Shaped Subwoofer 1

[0102]

[0103]

[0104] The synergistic design of the curved horn profile and radial gradient opening achieves the following while maintaining a total opening ratio of 32%: a 6dB reduction in turbulence noise, a 14% improvement in stroke linearity, and an extension of low-frequency dive to 28Hz (-3dB).

[0105] In this embodiment, as an optional example (not shown in the figure), the dome diaphragm is a titanium / ceramic coated silk composite dome.

[0106] In this embodiment, as an optional example (not shown in the figure), the first annular diaphragm is an aramid / carbon fiber hybrid honeycomb sandwich diaphragm.

[0107] In this embodiment, as an optional example (not shown in the figure), the second annular diaphragm is a basalt fiber reinforced PP diaphragm or a carbon fiber / foamed silicone sandwich diaphragm.

[0108] It should be noted that the above three types of diaphragms are all existing diaphragms, and were specifically selected in this case based on the concentric structure design. Further details about the three types of diaphragms will not be provided here.

[0109] In this embodiment, as an optional example (not shown in the figure), the overlap area between the high-frequency and mid-frequency curves of the coil speaker is 1.5kHz-3kHz, and the overlap area between the stacked regions of the mid-frequency and low-frequency curves is 200Hz-500Hz. Increasing the crossover filter makes the overall curve of the stacked region tend to be a flat frequency response curve, ensuring that the original sound is neither enhanced nor weakened during operation, thus restoring the original sound. Please refer to [link / reference]. Figure 5 .

[0110] For example, the frequency division topology and overlap region parameters are shown in the table below:

[0111] Table 8 Frequency Division Topology and Overlap Region Parameters

[0112]

[0113] I. Collaboration Plan

[0114] 1. Time alignment compensation (physical acoustic center difference compensation)

[0115] High-frequency delay = 0.08ms (phase plug waveguide)

[0116] Bass delay = -0.15ms (shortened front cavity acoustic path)

[0117] Net time difference = |0.08 - (-0.15)| = 0.23ms → DSP correction remaining 0.07ms

[0118] 2. Energy distribution in the overlapping region

[0119] frequency band High-frequency energy percentage Midrange energy percentage Bass energy percentage 2.2kHz 54％ 46％ 0％ 350Hz 0％ 62％ 38％

[0120] II. Diaphragm-Frequency Coupling Design

[0121] In the high-midrange overlap region (1.5-3kHz), the dome diaphragm is optimized: the titanium / ceramic silk composite diaphragm provides >12dB suppression of split vibration at 2.5kHz. The hyperbolic profile ensures off-axis response ripple of <±1.2dB (within 30°).

[0122] Midrange Fresnel rings: Ring depth algorithm optimization:

[0123]

[0124] III. Electronic Frequency Division Implementation Scheme

[0125] 1. For details on the frequency divider DSP module, please refer to [link / reference]. Figure 6 The entire process involves sending the digital audio signal converted by the ADC into three processing paths: high-pass, band-pass, and low-pass. Specific filtering processes are performed on the audio signals of different frequency bands, along with subsequent delay or phase correction operations, to achieve audio signal optimization.

[0126] 2. Overlapping region FIR filter parameters

[0127] Frequency band interface Number of taps Core Algorithm Function High-middle range 512 Minimum phase IIR + linear phase FIR Group delay matching error <4μs Mid-bass 256 Bessel-Thiele hybrid model Phase continuity > 175°

[0128] In this embodiment, the concentric arrangement of three speakers is the core innovation of this invention, but it also brings a series of challenges, such as acoustic interference (blocking / diffraction), vibration transmission (intermodulation distortion), airflow obstruction, and difficulties in directivity / phase coordination. Each new feature in this embodiment is essentially a solution to these specific defects caused by the concentric structure itself: the diaphragm structure design directly optimizes the sound wave path (e.g., midrange inner diameter), airflow management (bass aperture ratio / mode), and diaphragm shape / edge design (controlling diffraction, directivity, and radiation efficiency). Differentiated voice coil design is used to suppress vibration transmission and optimize spatial efficiency. Material selection achieves lightweight, high rigidity, and high damping within spatial constraints, suppressing resonance and reducing vibration transmission. A specially designed wide overlap area addresses phase issues caused by inconsistent acoustic centers, achieving a smooth transition.

[0129] The above description is only a part of the embodiments of this utility model, and does not limit the scope of protection of this utility model. Any equivalent device or equivalent process transformation made based on the content of this utility model specification and drawings, or direct or indirect application in other related technical fields, are similarly included in the patent protection scope of this utility model.

Claims

1. A coil horn, characterized in that, The loudspeaker includes a three-way crossover unit, and a dome tweeter, a ring midrange horn, and a ring woofer arranged concentrically from the inside out. The dome tweeter uses a dome diaphragm, the ring midrange speaker uses a first ring diaphragm, and the ring woofer uses a second ring diaphragm. This three-way unit is used to divide the audio signal into high-frequency, mid-frequency, and low-frequency bands, and input them to the corresponding speakers respectively.

2. A coil horn as described in claim 1, characterized in that, The dome diaphragm, the first annular diaphragm, and the second annular diaphragm are driven by a first voice coil, a second voice coil, and a third voice coil, respectively, wherein the size of the first voice coil is smaller than that of the second voice coil, and the size of the second voice coil is smaller than that of the third voice coil.

3. A coil speaker as described in claim 1, characterized in that, The inner diameter of the first annular diaphragm is ≥ 2 times the diameter of the dome diaphragm, and the opening ratio of the second annular diaphragm is > 30%.

4. A coil speaker as described in claim 1, characterized in that, The dome diaphragm has a double curvature profile, and the ratio of the radius of curvature in the central region to the radius of curvature in the edge region is 2.5 to 3.5:

1.

5. A coil speaker as described in claim 4, characterized in that, The first annular diaphragm adopts a catenary curved surface profile and has a Fresnel ring with a gradually varying depth on its surface, and the edges adopt a chamfered design with at least 12 sides.

6. A coil horn as described in claim 1, characterized in that, The second annular diaphragm has a curved horn profile and is provided with a number of openings arranged radially, wherein the density of the inner openings is greater than that of the outer openings.

7. A coil horn as described in claim 1, characterized in that, The dome diaphragm is a titanium / ceramic coated silk composite dome.

8. A coil speaker as described in claim 1, characterized in that, The first annular diaphragm is an aramid / carbon fiber hybrid honeycomb sandwich diaphragm.

9. A coil horn as described in claim 1, characterized in that, The second annular diaphragm is a basalt fiber reinforced PP diaphragm or a carbon fiber / foamed silicone sandwich diaphragm.

10. A coil horn as described in claim 1, characterized in that, The overlap area between the high-frequency curve and the mid-frequency curve of the coil speaker is 1.5kHz-3kHz, and the overlap area between the stacked region of the mid-frequency curve and the low-frequency curve is 200Hz-500Hz.

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