The loudspeaker and its acoustic structure with waveguide structure as the rear cavity of a single unit

Abstract

This application provides a speaker device and an acoustic structure with a waveguide structure as the rear cavity of a single unit. The acoustic structure with a waveguide structure as the rear cavity of a single unit includes a main speaker enclosure, a waveguide structure, and a dual-sided speaker module. The waveguide structure is disposed within the housing space of the main speaker enclosure and includes a waveguide cavity and a resonant rear cavity connected to the waveguide cavity. The dual-sided speaker module includes a front speaker diaphragm and a rear speaker diaphragm disposed opposite to the front speaker diaphragm. When the second opening is open, the front speaker diaphragm operates to generate a first sound wave, which is guided by the waveguide cavity through the second opening to produce sound, and the resonant chamber of the resonant rear cavity becomes the resonant rear cavity for the operation of the front speaker diaphragm. When the second opening is closed, the rear speaker diaphragm operates to generate a second sound wave, which is guided by the sound channel through the first opening to produce sound, and the resonant chamber of the resonant rear cavity becomes the resonant rear cavity for the operation of the rear speaker diaphragm.

Description

Technical Field

[0001] This application relates to the technical field of loudspeakers, and in particular to a loudspeaker device and its acoustic structure with a waveguide structure as the rear cavity of a single unit. Background Technology

[0002] The speaker enclosure is equipped with a conical waveguide structure to guide the sound waves generated by the diaphragm vibrating unit in a designated direction. However, the existing speaker enclosure waveguide structure only serves to guide the sound waves and has no other purpose.

[0003] Furthermore, since immersive sound fields are currently the design trend and mainstream, existing audio systems often include surround speakers next to the main speakers to provide sound wave transmission from other directions, thereby creating an immersive sound field effect. In some speaker designs, when surround speakers are combined with the main speakers, the surround speakers will block the waveguide structure on the side of the main speakers, preventing the diaphragm drivers located on the side of the main speakers from emitting sound due to the blocked waveguide structure. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this application is to provide a loudspeaker device and its acoustic structure with a waveguide structure as the rear cavity of a single unit, in order to solve the problem that the use of the waveguide structure is limited in the prior art, and that when the surround speaker is combined with the main speaker, the waveguide structure on the side of the main speaker is closed and cannot produce sound.

[0005] To achieve the above and other related objectives, this application provides a loudspeaker device and an acoustic structure with a waveguide structure as the rear cavity of a single unit:

[0006] An embodiment of this application describes an acoustic structure using a waveguide structure as the rear cavity of a single unit, comprising a main speaker, a waveguide structure, and a dual-sided speaker module. The main speaker includes a channel and an accommodating space communicating with the channel. The channel has a first opening on one side of the main speaker, and the accommodating space has a second opening on the other side of the main speaker. The waveguide structure is disposed within the accommodating space of the main speaker. The waveguide structure includes a waveguide cavity and a resonant rear cavity connected to the waveguide cavity. The waveguide cavity has a waveguide channel communicating with the second opening. The resonant rear cavity is adjacent to the channel and has a resonant chamber. The dual-sided speaker module includes a front speaker diaphragm and a rear speaker diaphragm disposed opposite to the front speaker diaphragm. The front speaker diaphragm is disposed in the waveguide cavity and generates a first sound wave along a first direction. The rear speaker diaphragm is disposed in the resonant rear cavity and generates a second sound wave along a second direction. The first and second directions are opposite directions. The first sound wave is guided by the waveguide cavity through the second opening and amplified, while the second sound wave is guided by the channel through the first opening and amplified. When the second opening is open, the front diaphragm operates to generate the first sound wave, and the resonant chamber of the resonant cavity becomes the resonant cavity for the operation of the front diaphragm. When the second opening is closed, the rear diaphragm operates to generate the second sound wave, and the resonant chamber of the resonant cavity becomes the resonant cavity for the operation of the rear diaphragm.

[0007] Optionally, the width of the waveguide channel gradually widens from the second opening at the front speaker diaphragm.

[0008] Optionally, the front and rear diaphragms are arranged adjacent to each other. The front diaphragm is disposed on the first bottom wall of the waveguide cavity near the sound channel, and the rear diaphragm is disposed on the second bottom wall of the resonant cavity adjacent to the sound channel. The first and second bottom walls are parallel and separated by a predetermined distance.

[0009] Optionally, the dual-sided speaker module includes a front speaker and a rear speaker arranged opposite to each other, with the front speaker diaphragm disposed on the front speaker and the rear speaker diaphragm disposed on the rear speaker, and the connection between the front speaker and the rear speaker is located in the resonant cavity.

[0010] Optionally, the waveguide cavity may also include a waveguide peripheral wall connected to the first bottom wall, the waveguide peripheral wall surrounding to form a waveguide channel.

[0011] Optionally, the waveguide perimeter is formed by multiple arcuate walls connected to each other, each arcuate wall curving away from the first bottom wall toward the frontal diaphragm.

[0012] Optionally, the resonant cavity also includes a cavity peripheral wall connected to the second bottom wall, the cavity peripheral wall corresponding to the waveguide peripheral wall, and the end of the cavity peripheral wall near the second opening connected to the waveguide peripheral wall, so that the cavity peripheral wall, the waveguide peripheral wall, the first bottom wall and the second bottom wall surround to form a resonant cavity.

[0013] Optionally, the first opening and the second opening are located on two adjacent surfaces of the main speaker, respectively.

[0014] Optionally, the waveguide peripheral wall includes multiple through holes, and the waveguide channel is connected to the resonant cavity through the multiple through holes, so that the waveguide channel can also become the resonant cavity of the front speaker diaphragm or the resonant cavity of the back speaker diaphragm.

[0015] Optionally, the size of the rear speaker diaphragm is larger than the size of the front speaker diaphragm.

[0016] Optionally, the multiple through holes are configured to be openable or closed, such that when the second opening is open, the multiple through holes are closed; and when the second opening is closed, the multiple through holes are open.

[0017] Optionally, the dual-sided speaker module also includes a magnetic component, which generates an electromagnetic effect with the coil corresponding to the front speaker diaphragm or the coil corresponding to the rear speaker diaphragm.

[0018] One embodiment of the speaker device of this application includes a main speaker and surround speakers. The main speaker includes the aforementioned acoustic structure with a waveguide structure as the rear cavity of a single unit. The surround speakers are selectively combined with the main speaker enclosure of the main speaker, and when the surround speakers are combined with the main speaker enclosure, the surround speakers close the second opening of the main speaker enclosure.

[0019] As described above, this application has the following beneficial effects:

[0020] The acoustic structure of this application, which uses a waveguide structure as the rear cavity of a single unit, allows the speaker module on one side of the main speaker to emit sound through the main speaker channel even when the waveguide channel of the waveguide structure is sealed by the surround speaker. Moreover, the waveguide structure can act as the resonant rear cavity for the operation of the rear speaker diaphragm, so as not to completely lose the function of the speaker unit. Furthermore, the waveguide structure increases the volume of the resonant rear cavity, resulting in a sufficiently good acoustic effect. Attached Figure Description

[0021] Figure 1 The diagram shown is a partial exploded perspective view of a loudspeaker device according to an embodiment of this application.

[0022] Figure 2 Displayed as Figure 1 A cross-sectional view of a loudspeaker device.

[0023] Figure 2A Displayed as Figure 2 An enlarged view of part A.

[0024] Figure 3 Displayed as Figure 1 A three-dimensional diagram of the speaker system.

[0025] Figure 4 Displayed as Figure 3 A sectional view along line AA.

[0026] Figure 5 Displayed as Figure 3 Sectional view along line BB.

[0027] Figure 5A Displayed as Figure 5 An enlarged view of part B.

[0028] Figure 6 The diagram shown is an exploded perspective view of an acoustic structure with a waveguide structure as the single-unit rear cavity, according to an embodiment of this application.

[0029] Figure 7 The diagram shown is a partial exploded perspective view of a loudspeaker device according to another embodiment of this application.

[0030] Figure 8 Displayed as Figure 7 A cross-sectional view of the assembled loudspeaker unit.

[0031] Figure 8A Displayed as Figure 8 An enlarged view of part C.

[0032] Component labeling explanation

[0033] 1: Speaker unit; 10: Main loudspeaker; 11: Main speaker enclosure; 11a: Front surface; 11b: Side surface; 12: Waveguide structure; 13: Dual-sided speaker module; 20: Surround loudspeaker; 100: Acoustic structure with waveguide structure as the rear cavity of the speaker; 111: Channel; 112: Accommodation space; 113: First opening; 114: Second opening; 121: Waveguide cavity; 121a: Waveguide peripheral wall; 121b: First bottom wall; 121c: Waveguide channel; 121d: Arc-shaped wall; 121e: Through hole; 122: Resonant rear cavity; 122a: Cavity peripheral wall; 122b: Second bottom wall; 122c: Resonant chamber; 131: Front speaker diaphragm; 131a: Front speaker; 132: Rear speaker diaphragm; 132a: Rear speaker; L1: First direction; L2: Second direction Detailed Implementation

[0034] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application.

[0035] For ease of description, spatial relation terms such as “below,” “under,” “lower than,” “below,” “above,” and “upper” may be used herein to describe the relationship between one component or feature shown in the accompanying drawings and other components or features. It will be understood that these spatial relation terms are intended to include directions other than those depicted in the accompanying drawings for devices in use or operation.

[0036] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0037] Please see Figure 1 , Figure 2 , Figure 2A , Figure 3 , Figure 4 , Figure 5 and Figure 5A ,in Figure 1 The diagram shown is a partial exploded perspective view of a loudspeaker device according to an embodiment of this application. Figure 2 Displayed as Figure 1 A cross-sectional view of the speaker device. Figure 2A Displayed as Figure 2 An enlarged view of part A. Figure 3 Displayed as Figure 1 A three-dimensional diagram of the speaker system. Figure 4 Displayed as Figure 3 Sectional view along line AA, Figure 5 Displayed as Figure 3 Sectional view along line BB. Figure 5A Displayed as Figure 5 An enlarged view of part B. As shown, a speaker device 1 according to an embodiment of this application includes a main speaker 10 and a surround speaker 20. The main speaker 10 includes an acoustic structure 100 with a waveguide structure as the rear cavity of a single unit. The surround speaker 20 is selectively combined with the main speaker 10. The acoustic structure 100 with a waveguide structure as the rear cavity of a single unit in this embodiment includes a main speaker enclosure 11, a waveguide structure 12, and a dual-sided speaker module 13.

[0038] The main speaker enclosure 11 has a cuboid structure, including a front surface 11a and a side surface 11b, with the side surface 11b adjacent to the front surface 11a. Inside the main speaker enclosure 11, a sound channel 111 and an accommodating space 112 communicating with the sound channel 111 are formed. The sound channel 111 has a first opening 113 on the front surface 11a, and the accommodating space 112 has a second opening 114 on the side surface 11b. The sound channel 111 is an arc-shaped channel extending from the accommodating space 112 to the front surface 11a. The accommodating space 112 is a square cavity adjacent to the side surface 11b of the main speaker enclosure 11, used to accommodate the waveguide structure 12 described later.

[0039] Waveguide structure 12 is disposed in the accommodating space 112 of main speaker 11, please refer to it as well. Figure 6 , Figure 6 The diagram shown is an exploded perspective view of an acoustic structure using a waveguide structure as the rear cavity of a single unit, according to an embodiment of this application. Figure 6 As shown, the waveguide structure 12 includes a waveguide cavity 121 and a resonant rear cavity 122 connected to the waveguide cavity 121.

[0040] The waveguide cavity 121 of this embodiment includes a waveguide peripheral wall 121a and a first bottom wall 121b connected to the waveguide peripheral wall 121a. The waveguide peripheral wall 121a surrounds and forms a waveguide channel 121c, one end of which is connected to a second opening 114. The first bottom wall 121b is arranged parallel to the second opening 114. The waveguide peripheral wall 121a and the first bottom wall 121b are connected to form a partition wall structure separating the waveguide cavity 121 from the resonant cavity 122. The waveguide peripheral wall 121a is formed by connecting multiple arc-shaped walls 121d in pairs. Each arc-shaped wall 121d extends from the first bottom wall 121b toward the second opening 114, and each arc-shaped wall 121d bends away from the centerline of the second opening 114, so that the width of the waveguide channel 121c gradually widens from the first bottom wall 121b toward the second opening 114 to form a horn shape, which is beneficial for expanding the range of sound wave transmission.

[0041] The resonant cavity 122 is adjacent to the channel 111 of the main speaker 11. The resonant cavity 122 includes a cavity peripheral wall 122a and a second bottom wall 122b connected to the cavity peripheral wall 122a. The cavity peripheral wall 122a corresponds to the waveguide peripheral wall 121a, and the end of the cavity peripheral wall 122a near the second opening 114 is connected to the waveguide peripheral wall 121a, so that the cavity peripheral wall 122a, the waveguide peripheral wall 121a, the first bottom wall 121b, and the second bottom wall 122b surround to form a resonant chamber 122c. The waveguide channel 121c of the waveguide cavity 121 is adjacent to the second opening 114 and the resonant chamber 122c of the resonant cavity 122, and the resonant chamber 122c of the resonant cavity 122 is adjacent to the waveguide channel 121c and the channel 111 of the main speaker 11.

[0042] The dual-sided speaker module 13 includes a front speaker diaphragm 131, a front speaker unit 131a, a rear speaker diaphragm 132, and a rear speaker unit 132a. The front speaker diaphragm 131 is disposed on the front speaker unit 131a, and the rear speaker diaphragm 132 is disposed on the rear speaker unit 132a. In this embodiment, the front speaker unit 131a and the rear speaker unit 132a are disposed opposite to each other and connected to each other. The front speaker diaphragm 131 is located in the waveguide cavity 121 and generates a first sound wave along a first direction L1. The rear speaker diaphragm 132 is located in the resonant cavity 122 and generates a second sound wave along a second direction L2. The first direction L1 and the second direction L2 are opposite directions. The first sound wave is guided by the waveguide cavity 121 through the second opening 114 and amplified, while the second sound wave is guided by the channel 111 of the main speaker 11 through the first opening 113 and amplified. The front speaker unit 131a and the rear speaker unit 132a are arranged adjacent to each other. The front speaker unit 131a is located on the first bottom wall 121b of the waveguide cavity 121 near the channel 111 of the main speaker 11. The rear speaker unit 132a is located on the second bottom wall 122b of the resonant cavity 122 adjacent to the channel 111. The first bottom wall 121b and the second bottom wall 122b are parallel and separated by a predetermined distance. The connection between the front speaker unit 131a and the rear speaker unit 132a is located within the resonant cavity 122. The dual-sided speaker unit module 13 also includes a magnetic component (not shown in the figure). The magnetic component is located at the connection between the front speaker unit 131a and the rear speaker unit 132a, so that the front speaker diaphragm 131 and the rear speaker diaphragm 132 share the same magnetic component. The magnetic component generates an electromagnetic effect with the coil of the front speaker unit 131a or the coil of the rear speaker unit 132a.

[0043] In another embodiment, the front diaphragm 131 and the rear diaphragm 132 can also be disposed on opposite sides of a single speaker unit, respectively emitting a first sound wave in a first direction and a second sound wave in a second direction, with the speaker unit spanning the resonant chamber 122c. This embodiment can also be applied to a coaxial speaker to simulate and optimize sound production.

[0044] When the second opening 114 opens, as Figure 1 , Figure 2 and Figure 2AAs shown, the surround speaker 20 and the main speaker 10 are separated from each other. The front diaphragm 131 operates to generate a first sound wave. The first sound wave is guided by the waveguide channel 121c and emitted through the second opening 114. The resonant chamber 122c of the resonant cavity 122 becomes the resonant cavity for the operation of the front diaphragm 131. Thus, when the user uses the main speaker 10 alone, the first sound wave generated by the front diaphragm 131 can be guided in a specific direction by the waveguide structure 12, achieving a highly directional speaker array. At the same time, the resonant chamber 122c of the resonant cavity 122, as the resonant cavity for the operation of the front diaphragm 131, optimizes the acoustic effect of the sound field.

[0045] When the second opening 114 is closed, as Figure 3 , Figure 4 , Figure 5 and Figure 5A As shown, the surround speaker 20 is integrated with the main speaker 10, and the surround speaker 20 closes the second opening 114 of the main speaker enclosure 11. The rear diaphragm 132 operates to generate a second sound wave, and the resonant chamber 122c of the resonant cavity 122 becomes the resonant cavity for the operation of the rear diaphragm 132. Thus, when the user integrates the surround speaker 20 with the main speaker 10 to form a surround sound field, the second sound wave generated by the rear diaphragm 132 can still be transmitted through the channel 111 of the main speaker enclosure 11 via the first opening 113. At the same time, the resonant chamber 122c of the resonant cavity 122, as the resonant cavity for the operation of the rear diaphragm 132, can also optimize the acoustic effect of the sound field.

[0046] Please see Figure 7 , Figure 8 and Figure 8A ,in Figure 7 The diagram shown is a partial exploded perspective view of a speaker device according to another embodiment of this application. Figure 8 Displayed as Figure 7 A cross-sectional view of the assembled speaker system. Figure 8A Displayed as Figure 8An enlarged view of part C. As shown in the figure, this embodiment has some of the same structure as the previous embodiment, therefore the same components are given the same symbols and their descriptions are omitted. The difference between this embodiment and the previous embodiment is that the waveguide peripheral wall 121a of this embodiment includes multiple through holes 121e. The waveguide channel 121c is connected to the resonant cavity 122c through the multiple through holes 121e, so that the waveguide channel 121c can also constitute the resonant rear cavity for the operation of the back-side speaker diaphragm 132. That is, when the back-side speaker diaphragm 132 is running, the waveguide channel 121c and the resonant cavity 122c are connected to jointly form the resonant rear cavity for the operation of the back-side speaker diaphragm 132. In this way, the volume of the resonant rear cavity is increased, and better acoustic effects can be obtained. The multiple through holes are configured to be openable or closed. When the surround speaker 20 is separated from the main speaker 10, the second opening 114 is opened. At this time, the multiple through holes 121c are closed, and the waveguide channel 121c is used to guide the first sound wave. When the surround speaker 20 is combined with the main speaker 10, the surround speaker 20 closes the second opening 114. At this time, multiple through holes 121c are opened, and the waveguide channel 121c and the resonant cavity 122c are connected to form the resonant rear cavity in which the rear speaker diaphragm 132 operates. In addition, the size of the rear speaker diaphragm 132 in this embodiment is larger than the size of the front speaker diaphragm 131, thereby achieving better acoustic performance in conjunction with the enlarged resonant rear cavity (where the waveguide channel 121c is connected to the resonant cavity 122c).

[0047] The acoustic structure of this application, which uses a waveguide structure as the rear cavity of a single unit, allows the speaker module on one side of the main speaker to emit sound through the main speaker's channel even when the waveguide channel of the waveguide structure is sealed by the surround speaker. Furthermore, the waveguide structure acts as a resonant rear cavity for the rear speaker diaphragm, preventing the speaker unit from completely losing its sound-emitting function. The increased volume of the resonant rear cavity due to the waveguide structure also produces a sufficiently good acoustic effect. High directivity is optimized for the acoustic performance by utilizing cabinet diffraction.

[0048] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.

Claims

1. An acoustic structure with a waveguide structure as a monolithic back cavity, characterized in that ,include: A main speaker includes a channel and an accommodating space communicating with the channel, the channel having a first opening on one side of the main speaker and the accommodating space having a second opening on the other side of the main speaker; A waveguide structure is disposed in the accommodating space of the main speaker. The waveguide structure includes a waveguide cavity and a resonant rear cavity connected to the waveguide cavity. The waveguide cavity has a waveguide channel communicating with the second opening. The resonant rear cavity is adjacent to the channel and has a resonant chamber. A dual-sided speaker module includes a front speaker diaphragm and a back speaker diaphragm disposed opposite to the front speaker diaphragm. The front speaker diaphragm is disposed in the waveguide cavity and generates a first sound wave along a first direction. The back speaker diaphragm is disposed in the resonant cavity and generates a second sound wave along a second direction. The first direction and the second direction are opposite directions. The first sound wave is guided by the waveguide cavity through the second opening and amplified. The second sound wave is guided by the sound channel through the first opening and amplified. When the second opening is open, the front diaphragm operates to generate the first sound wave, and the resonant chamber of the resonant cavity becomes the resonant cavity of the front diaphragm. When the second opening is closed, the rear-side diaphragm operates to generate the second sound wave, and the resonant chamber of the resonant cavity becomes the resonant cavity of the rear-side diaphragm.

2. The acoustic structure with a waveguide structure as a monolithic back volume according to claim 1, characterized in that The width of the waveguide channel gradually increases from the second opening of the front-facing diaphragm.

3. The acoustic structure with a waveguide structure as a monolithic back volume according to claim 1 or 2, characterized in that The front and rear diaphragms are arranged adjacent to each other. The front diaphragm is disposed on the first bottom wall of the waveguide cavity near the channel, and the rear diaphragm is disposed on the second bottom wall of the resonant cavity adjacent to the channel. The first and second bottom walls are parallel and separated by a predetermined distance.

4. The acoustic structure with a waveguide structure as a monolithic back volume according to claim 3, characterized in that The dual-sided speaker module includes a front speaker and a rear speaker arranged opposite to each other. The front speaker diaphragm is disposed on the front speaker and the rear speaker diaphragm is disposed on the rear speaker. The connection between the front speaker and the rear speaker is located in the resonant cavity.

5. The acoustic structure using a waveguide structure as the single-unit rear cavity as described in claim 3, characterized in that... The waveguide cavity further includes a waveguide peripheral wall connected to the first bottom wall, and the waveguide peripheral wall surrounds to form the waveguide channel.

6. The acoustic structure with a waveguide structure as a monolithic back volume according to claim 5, characterized in that The waveguide perimeter is formed by multiple arc-shaped walls connected to each other, each arc-shaped wall bending away from the first bottom wall in a direction away from the front diaphragm.

7. The acoustic structure with a waveguide structure as a monolithic back volume according to claim 6, characterized in that The resonant cavity further includes a cavity peripheral wall connected to the second bottom wall. The cavity peripheral wall corresponds to the waveguide peripheral wall, and one end of the cavity peripheral wall near the second opening is connected to the waveguide peripheral wall, so that the cavity peripheral wall, the waveguide peripheral wall, the first bottom wall and the second bottom wall surround to form the resonant cavity.

8. The acoustic structure using a waveguide structure as the single-unit rear cavity as described in claim 7, characterized in that... The first opening and the second opening are respectively located on two adjacent surfaces of the main speaker.

9. The acoustic structure of claim 5, wherein the waveguide structure is a monolithic back volume. The waveguide peripheral wall includes multiple through holes, and the waveguide channel is connected to the resonant cavity through the multiple through holes, so that the waveguide channel also becomes the resonant cavity of the front speaker diaphragm or the resonant cavity of the rear speaker diaphragm.

10. The acoustic structure with a waveguide structure as a monolithic back volume according to claim 9, characterized in that The plurality of through holes are configured to be openable or closed, wherein when the second opening is open, the plurality of through holes are closed; and when the second opening is closed, the plurality of through holes are open.

11. The acoustic structure with a waveguide structure as a monolithic back volume according to claim 9, characterized in that The size of the rear speaker diaphragm is larger than the size of the front speaker diaphragm.

12. The acoustic structure using a waveguide structure as the single-unit rear cavity as described in claim 1, characterized in that... The dual-sided speaker module also includes a magnetic component, which generates an electromagnetic effect with the coil corresponding to the front speaker diaphragm or the coil corresponding to the rear speaker diaphragm.

13. The acoustic structure of claim 1, wherein the waveguide structure is a monolithic back volume. 13 The dual-sided speaker module includes a speaker unit, with the front speaker diaphragm and the back speaker diaphragm disposed on opposite sides of the speaker unit, and the speaker unit spanning the resonant cavity.

14. A loudspeaker device, characterized by ,include: The main loudspeaker includes an acoustic structure as described in any one of claims 1 to 13, which uses a waveguide structure as the unit rear cavity. A surround speaker, which is selectively coupled to the main speaker enclosure, wherein when the surround speaker is coupled to the main speaker enclosure, the surround speaker closes the second opening of the main speaker enclosure.

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