CN111343542B

CN111343542B - Loudspeaker box

Info

Publication number: CN111343542B
Application number: CN202010148072.6A
Authority: CN
Inventors: 令狐荣林; 肖波; 章统
Original assignee: AAC Technologies Pte Ltd
Current assignee: AAC Technologies Pte Ltd
Priority date: 2020-03-05
Filing date: 2020-03-05
Publication date: 2021-08-10
Anticipated expiration: 2040-03-05
Also published as: WO2021174570A1; CN111343542A

Abstract

The invention provides a loudspeaker box capable of improving effective vibration area, which comprises a box body with a containing cavity and a sound production device, wherein the containing cavity is divided into a front cavity and a rear cavity by a partition plate, the partition plate is provided with a single body leakage hole communicated with the rear cavity, the box body is provided with a sound outlet hole communicated with the front cavity in a penetrating way, the sound production device is suspended in the front cavity and comprises a basin frame, a vibration system and a magnetic circuit system, the basin frame is provided with a leakage hole communicated with the single body leakage hole, the vibration system comprises the basin frame, an upper vibration film and a lower vibration film which have opposite vibration directions, an upper voice coil, a lower voice coil and a framework connected with the lower voice coil and the lower vibration film, the magnetic circuit system comprises a clamping plate, a first magnetic part, a second magnetic part forming an inner magnetic gap with the first magnetic part and a third magnetic part forming an outer magnetic gap with the second magnetic part, and the third magnetic part is provided with a leakage channel communicated with the outer magnetic gap, the upper voice coil is inserted into the inner magnetic gap, the lower voice coil is inserted into the outer magnetic gap, and the clamping plate is provided with avoiding holes for avoiding the frameworks.

Description

Loudspeaker box

[ technical field ] A method for producing a semiconductor device

The invention relates to the field of acoustoelectric, in particular to a loudspeaker box applied to portable electronic products.

[ background of the invention ]

With the advent of the mobile internet age, the number of smart mobile devices is increasing. Among the mobile devices, the mobile phone is undoubtedly the most common and portable mobile terminal device. At present, the functions of a mobile phone are very diverse, one of which is a high-quality music function, and thus, a speaker box for playing sound is widely applied to the current smart mobile devices.

The loudspeaker box comprises a box body with a containing cavity and a sound production device arranged in the box body, and a sound hole penetrates through the box body. The sound-generating device in the related art has only one sound-generating surface, and thus is not favorable for improving the sensitivity of the speaker box.

Therefore, there is a need to provide a new speaker box to solve the above technical problems.

[ summary of the invention ]

The invention aims to provide a loudspeaker box, which can improve the effective vibration area and improve the sensitivity of the loudspeaker box.

In order to achieve the above object, the present invention provides a loudspeaker box, comprising a box body having a receiving cavity and a sound generating device, wherein a partition plate is arranged in the box body and divides the receiving cavity into a front cavity and a rear cavity, a single body leakage hole communicated with the rear cavity is arranged on the partition plate in a penetrating manner, a sound generating hole communicated with the front cavity is arranged on the box body in a penetrating manner, the sound generating device is suspended in the front cavity, the sound generating device comprises a basin frame abutted against the partition plate, a vibration system fixed on the basin frame and a magnetic circuit system for driving the vibration system to vibrate and generate sound, a leakage hole communicated with the single body leakage hole is arranged on the basin frame in a penetrating manner, the vibration system comprises an upper vibration membrane and a lower vibration membrane which are respectively fixed on two opposite sides of the basin frame and have opposite vibration directions, an upper voice coil for driving the upper vibration membrane to generate sound, a lower voice coil for driving the lower vibration membrane to vibrate and generate sound, and a framework for connecting the lower voice coil and the lower vibration membrane, the upper vibrating diaphragm, the lower vibrating diaphragm and the basin frame are enclosed to form an accommodating space for accommodating the magnetic circuit system, the magnetic circuit system comprises a clamping plate fixedly held on the basin frame, a first magnetic part, a second magnetic part and a third magnetic part, the first magnetic part, the second magnetic part and the third magnetic part are fixedly arranged on one side, facing the upper vibrating diaphragm, of the clamping plate, the second magnetic part surrounds the first magnetic part, an inner magnetic gap is formed between the first magnetic part and the second magnetic part, the third magnetic part surrounds the second magnetic part, an outer magnetic gap is formed between the second magnetic part and the second magnetic part, the third magnetic part is provided with a leakage channel communicated with the outer magnetic gap and the leakage hole, the upper voice coil is inserted into the inner magnetic gap, the lower voice coil is inserted into the outer magnetic gap, and an avoidance hole for avoiding the framework is arranged in a position, facing the outer magnetic gap, of the clamping plate in a penetrating mode.

Preferably, the third magnetic part is formed by a plurality of third permanent magnets surrounding the second magnetic part, and two adjacent third permanent magnets are arranged at intervals, wherein two adjacent third permanent magnets are arranged at intervals to form the leakage channel.

Preferably, the second magnetic part is a second permanent magnet, and the second permanent magnet is in a continuous annular structure.

Preferably, the skeleton include with the main part that lower vibrating diaphragm is connected reaches certainly the main part to splint direction extension forms and passes a plurality of connecting portion of dodging the hole, connecting portion with lower voice coil loudspeaker voice coil is connected.

Preferably, lower voice coil loudspeaker voice coil is fillet rectangle structure, connecting portion are equipped with four, and four connecting portion one-to-one connect in four fillets of lower voice coil loudspeaker voice coil.

Preferably, the vibration system further includes an upper dome and a lower dome disposed in the accommodating space, the upper dome is connected to the upper diaphragm and the upper voice coil along opposite sides in the vibration direction, and the lower dome is connected to the main body portion and the lower diaphragm along opposite sides in the vibration direction.

Preferably, first magnetism portion is kept away from first utmost point core has set firmly on one side of splint, second magnetism portion is kept away from second utmost point core has set firmly on one side of splint, third magnetism portion is kept away from third utmost point core has set firmly on one side of splint, splint are the splint that soft magnetic material made.

Preferably, the sounder further comprises an upper end cover and a lower end cover, the upper vibrating diaphragm clamp is arranged between the basin frame and the upper end cover, the upper end cover is provided with a first sounding hole for the outward sounding of the upper vibrating diaphragm, the lower vibrating diaphragm clamp is arranged between the basin frame and the lower end cover, and the lower end cover is provided with a second sounding hole for the outward sounding of the lower vibrating diaphragm.

Preferably, the box body comprises an upper bottom surface and a lower bottom surface, the upper bottom surface is opposite to the upper end cover and is arranged at an interval, the lower bottom surface is opposite to the lower end cover and is arranged at an interval, a plurality of first cushion blocks for supporting the upper end cover are arranged on the upper bottom surface, and a plurality of second cushion blocks for supporting the lower end cover are arranged on the lower bottom surface.

Compared with the prior art, the loudspeaker box has the advantages that the upper vibrating diaphragm and the lower vibrating diaphragm are arranged to be opposite in vibrating direction and driven by the upper voice coil and the lower voice coil respectively, and the sound generating device is arranged to be suspended in the front cavity, so that sound generated by the vibration of the upper vibrating diaphragm and the lower vibrating diaphragm is transmitted to the outside of the loudspeaker box through the sound outlet, and the effective vibrating area of the loudspeaker box is greatly increased, and the sensitivity of the loudspeaker box is improved; meanwhile, the magnetic circuit system is provided with the inner magnetic gap, the outer magnetic gap, the avoiding hole and the leakage channel, so that when the upper vibrating diaphragm and the lower vibrating diaphragm vibrate, airflow in the accommodating space can circulate with the rear cavity through the leakage hole and the single leakage hole. In addition, the upper voice coil and the lower voice coil are respectively inserted into the inner magnetic gap and the outer magnetic gap of the magnetic circuit system, so that the upper vibrating diaphragm and the lower vibrating diaphragm share the magnetic circuit system, and the utilization rate of a magnetic circuit is improved.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

FIG. 1 is a perspective view of a preferred embodiment of a speaker cabinet of the present invention;

FIG. 2 is a cross-sectional view of the loudspeaker enclosure of FIG. 1 taken along the direction A-A;

FIG. 3 is a cross-sectional view of the loudspeaker enclosure of FIG. 1 taken along the direction B-B;

FIG. 4 is a schematic structural view of a sound producing device in the loudspeaker enclosure of FIG. 2;

FIG. 5 is a schematic view of the sound producing device in the speaker box of FIG. 3;

FIG. 6 is an exploded perspective view of the sound device of FIG. 5;

FIG. 7 is an assembled structural schematic view of a portion of the vibration system of the sound device of FIG. 6;

FIG. 8 is an assembled structural view of a portion of the sound device shown in FIG. 6;

fig. 9 is a schematic view of the structure of fig. 8 with the clamping plates partially removed.

[ detailed description ] embodiments

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 9, the speaker box includes a box body 100 having a receiving cavity 100A and a sound generating device 200 disposed in the box body 100.

Be equipped with in the box 100 with hold chamber 100A and separate for front chamber 100B and rear chamber 100C's baffle 101, run through on the baffle 101 be equipped with the monomer hole 102 that leaks of rear chamber 100C intercommunication, run through on the box 100 be equipped with the hole 103 that gives sound of front chamber 100B intercommunication, sound production device 200 is suspended in the front chamber 100B.

The sounder 200 includes a frame 1 abutting against the partition 101, a vibration system 3 fixed on the frame 1, and a magnetic circuit system 5 for driving the vibration system 3 to vibrate and sound.

The basin stand 1 is provided with a leakage hole 1A communicated with the single body leakage hole 102 in a penetrating manner.

The magnetic circuit system 5 includes a clamp plate 51 fixed to the frame 1, and a first magnetic portion 52, a second magnetic portion 53, and a third magnetic portion 54 fixed to a side of the clamp plate 51 facing the upper diaphragm 31, where the second magnetic portion 53 is disposed around the first magnetic portion 52, an inner magnetic gap 5A is formed between the first magnetic portion and the second magnetic portion, the third magnetic portion 54 is disposed around the second magnetic portion 53, an outer magnetic gap 5B is formed between the second magnetic portion and the third magnetic portion, the third magnetic portion 54 has a leakage channel 54A communicating the outer magnetic gap 5B and the leakage hole 1A, an avoidance hole 511 is formed through a position of the clamp plate 51 facing the outer magnetic gap 5B, and the avoidance hole 511 is used for avoiding the frame 36.

In the present embodiment, the first magnetic part 52 is a first permanent magnet. It is understood that, in other embodiments, the first magnetic part 52 may also be formed by two, three, etc. first permanent magnets which are stacked along the vibration direction X, and a pole core may also be interposed between two adjacent first permanent magnets.

In this embodiment, the second magnetic part 53 is a second permanent magnet, and the second permanent magnet has a continuous ring structure. It is understood that, in other embodiments, the second magnetic part 53 may also be configured to be composed of a plurality of second permanent magnets surrounding the first magnetic part, and two adjacent second permanent magnets are disposed at intervals; alternatively, the second magnetic part 53 may be formed by superimposing two, three, or other continuous second permanent magnets in a ring structure along the vibration direction X, and a pole core may be interposed between two adjacent second permanent magnets.

In this embodiment, the third magnetic part 54 is formed by a plurality of third permanent magnets surrounding the second magnetic part 53, and two adjacent third permanent magnets are spaced apart from each other. Wherein, two of the third permanent magnets adjacent to the leakage hole 1A are disposed at an interval to form the leakage path 54A. It is understood that, in other embodiments, the third magnetic portion 54 may also be a second permanent magnet in an annular structure, and accordingly, a leakage channel communicating the outer magnetic gap and the leakage hole needs to be opened at a position of the second permanent magnet corresponding to the leakage hole.

The first permanent magnet, the second permanent magnet and the third permanent magnet are usually magnetic steels. It is to be understood that the first permanent magnet, the second permanent magnet, and the third permanent magnet may be natural magnets.

As shown in fig. 4, 5 and 6, a first pole core 55 is fixedly disposed on a side of the first magnetic portion 52 away from the clamping plate 51, a second pole core 56 is fixedly disposed on a side of the second magnetic portion 53 away from the clamping plate 51, a third pole core 57 is fixedly disposed on a side of the third magnetic portion 54 away from the clamping plate 51, and the clamping plate 51 is made of a soft magnetic material. Through the magnetic conduction effect of the first pole piece 55, the second pole piece 56, the third pole piece 57 and the clamping plate 51, the magnetic flux in the inner magnetic gap 5A and the magnetic flux in the outer magnetic gap 5B can be effectively increased, so that the acoustic performance of the sound production device 200 can be improved, and the sound production device 200 is also beneficial to the light and thin design.

In the present embodiment, the first pole piece 55, the second pole piece 56, and the third pole piece 57 are located in the same horizontal plane.

Vibration system 3 includes vibrating diaphragm 31, lower vibrating diaphragm 33, goes up voice coil 34, lower voice coil 35 and skeleton 36, go up vibrating diaphragm 31 with lower vibrating diaphragm 33 is fixed in respectively the relative both sides of basin frame 1, just go up vibrating diaphragm 31 with the vibration opposite direction of lower vibrating diaphragm 33, go up vibrating diaphragm 31 down vibrating diaphragm 33 reaches basin frame 1 encloses to close and forms accommodating space 200A, magnetic circuit 5 accept in accommodating space 200A, go up voice coil 34 drive go up vibrating diaphragm 31 vibration sound production, lower voice coil 35 drive vibrating diaphragm 33 vibration sound production down, skeleton 36 is connected voice coil 35 down with lower vibrating diaphragm 33. The upper voice coil 34 is inserted into the inner magnetic gap 5A, the lower voice coil 35 is inserted into the outer magnetic gap 5B, and the avoiding hole 511 of the clip plate 51 avoids the bobbin 36. Wherein, the upper voice coil 34 and the lower voice coil 35 are connected to an external power supply through a flexible circuit board (not shown), and after the upper voice coil 34 is powered on, the upper diaphragm 31 vibrates together with the upper voice coil 34 under the magnetic force of the magnetic circuit system 5; after the lower voice coil 35 is powered on, the lower diaphragm 33 and the bobbin 36 vibrate together with the lower voice coil 35 under the magnetic force of the magnetic circuit system 5. Since the upper diaphragm 31 and the lower diaphragm 33 are arranged to vibrate in opposite directions and are driven by the upper voice coil 34 and the lower voice coil 35 to generate sound, respectively, and the sound generating device 200 is arranged to be suspended in the front cavity 100B, the sound generated by the vibration of the upper diaphragm 31 and the lower diaphragm 33 is transmitted to the outside of the speaker box through the sound outlet holes 103, so that the effective vibration area of the speaker box is greatly increased to improve the sensitivity of the speaker box; meanwhile, since the magnetic circuit system 5 has the inner magnetic gap 5A, the outer magnetic gap 5B, the avoiding hole 511, and the leakage channel 54A, when the upper diaphragm 31 and the lower diaphragm 33 vibrate, the airflow in the accommodating space 200A can flow through the leakage hole 1A and the single body leakage hole 102 and the rear cavity 100C. In addition, because the upper voice coil 34 and the lower voice coil 35 are respectively inserted into the inner magnetic gap 5A and the outer magnetic gap 5B of the magnetic circuit system 5, the upper diaphragm 31 and the lower diaphragm 33 share the same magnetic circuit system, and the utilization rate of the magnetic circuit is improved.

It should be noted that the vibration directions of the upper diaphragm 31 and the lower diaphragm 33 are opposite to each other, which means that the instantaneous vibration directions are opposite to each other. Specifically, when the upper diaphragm 31 vibrates in a direction away from the magnetic circuit 5, the lower diaphragm 33 also vibrates in a direction away from the magnetic circuit 5; when the upper diaphragm 31 vibrates in a direction approaching the magnetic circuit 5, the lower diaphragm 33 also vibrates in a direction approaching the magnetic circuit 5.

The bobbin 36 includes a main body portion 361 connected to the lower diaphragm 33 and a plurality of connection portions 363 extending from the main body portion 361 toward the splint 51 and passing through the avoiding hole 511, and the connection portions 363 are connected to the lower voice coil 35. The framework 36 is provided with a plurality of connecting parts 363, so that the clamping plate 51 can be avoided to a greater extent, and the clamping plate 51 can be designed to utilize a more sufficient magnetic conduction effect to improve the magnetic flux of the outer magnetic gap 5B, thereby improving the vibration performance of the lower diaphragm 33.

As shown in fig. 4, 5, 6, and 7, the main body 361 has a flat plate shape. The main body 361 having a flat plate shape may enhance the connection strength between the frame 36 and the lower diaphragm 33. It is to be understood that the body 361 embodiment is not so limited; for example, in other embodiments, the main body 361 may be provided in a continuous ring structure.

As shown in fig. 6 and 7, the upper voice coil 34 and the lower voice coil 35 are in a rounded rectangular structure, four connection portions 363 are provided, and the four connection portions 363 are connected to four rounded corners of the lower voice coil 35 in a one-to-one correspondence manner. Wherein the flexible circuit boards are electrically soldered to the rounded positions of the upper voice coil 34 and the lower voice coil 35, respectively.

In order to enhance the vibration effect of the upper diaphragm 31 and the lower diaphragm 35 to improve the acoustic performance of the sounder device 200. In this embodiment, the vibration system 3 further includes an upper dome 37 and a lower dome 38 disposed in the accommodating space 200A, two opposite sides of the upper dome 37 along the vibration direction X are respectively connected to the upper diaphragm 31 and the upper voice coil 34, and two opposite sides of the lower dome 38 along the vibration direction X are respectively connected to the main body 361 and the lower diaphragm 33. It is understood that, in other embodiments, the upper dome 37 and the lower dome 38 may also be disposed outside the receiving space 200A, and two opposite sides of the upper diaphragm 31 along the vibration direction X are respectively connected to the upper voice coil 34 and the upper dome 37, and two opposite sides of the lower diaphragm 33 along the vibration direction X are respectively connected to the lower dome 38 and the main body portion 361.

As shown in fig. 4, 5 and 6, the sound generating device 200 further includes an upper end cover 7 and a lower end cover 9, the upper diaphragm 31 is clamped between the basin frame 1 and the upper end cover 7, the upper end cover 7 has a first sound emitting hole 71 for the upper diaphragm 31 to emit sound outwards, the lower diaphragm 33 is clamped between the basin frame 1 and the lower end cover 9, and the lower end cover 9 has a second sound emitting hole 91 for the lower diaphragm 33 to emit sound outwards. The upper end cover 7 and the lower end cover 9 are arranged, so that the upper vibrating diaphragm 31 and the lower vibrating diaphragm 33 can be better fixed on the frame 1.

In this embodiment, the box 100 includes an upper bottom surface 104 opposite to the upper cover 7 and disposed at an interval, and a lower bottom surface 105 opposite to the lower cover 9 and disposed at an interval, wherein the upper bottom surface 104 is provided with a plurality of first spacers 106 for supporting the upper cover 7, and the lower bottom surface 105 is provided with a plurality of second spacers 107 for supporting the lower cover 9. The sounder device 200 is suspended within the front cavity 100B by the support of the first plurality of blocks 106 and the second plurality of blocks 107. As shown in fig. 3, the first block 106 and the second block 107 are integrally formed with the box 100, it is understood that in other embodiments, the first block 106 may be a block fixed on the upper bottom surface 104, and the second block 107 may be a block fixed on the lower bottom surface 105.

Compared with the related art, the loudspeaker box of the invention has the advantages that the upper vibrating diaphragm 31 and the lower vibrating diaphragm 33 are arranged to have opposite vibrating directions and are respectively driven by the upper voice coil 34 and the lower voice coil 35, and the sound generating device 200 is arranged to be suspended in the front cavity 100B, so that the sound generated by the vibration of the upper vibrating diaphragm 31 and the lower vibrating diaphragm 33 is transmitted to the outside of the loudspeaker box through the sound outlet hole 103, and the effective vibrating area of the loudspeaker box is greatly increased to improve the sensitivity of the loudspeaker box; meanwhile, by configuring the magnetic circuit system 5 to have the inner magnetic gap 5A, the outer magnetic gap 5B, the avoiding hole 511, and the leakage channel 54A, when the upper diaphragm 31 and the lower diaphragm 33 vibrate, the airflow in the accommodating space 200A can flow through the leakage hole 1A and the single body leakage hole 102 and the rear cavity 100C. In addition, the upper voice coil 34 and the lower voice coil 35 are respectively inserted into the inner magnetic gap 5A and the outer magnetic gap 5B of the magnetic circuit system 5, so that the upper diaphragm 31 and the lower diaphragm 33 share the magnetic circuit system 5, thereby improving the utilization rate of the magnetic circuit.

While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.

Claims

1. A loudspeaker box comprises a box body with a containing cavity and a sound production device, and is characterized in that a partition board which divides the containing cavity into a front cavity and a rear cavity is arranged in the box body, a sound outlet communicated with the front cavity is arranged on the box body in a penetrating manner, a monomer leakage hole communicated with the rear cavity is arranged on the partition board in a penetrating manner, the sound production device is suspended in the front cavity, the sound production device comprises a basin frame abutted against the partition board and a magnetic circuit system fixedly arranged on the basin frame and used for driving a vibration system of the basin frame to vibrate and produce sound, a leakage hole communicated with the monomer leakage hole is arranged on the basin frame in a penetrating manner, the vibration system comprises an upper vibrating diaphragm and a lower vibrating diaphragm which are respectively fixed on two opposite sides of the basin frame and have opposite vibration directions, the upper voice coil and a lower voice coil are used for driving the upper vibrating diaphragm to vibrate and produce sound, the lower voice coil is used for driving the lower vibrating diaphragm and a framework of the lower vibrating diaphragm, the upper vibrating diaphragm, the lower vibrating diaphragm and the basin frame are enclosed to form an accommodating space for accommodating the magnetic circuit system, the magnetic circuit system comprises a clamping plate fixedly held on the basin frame, a first magnetic part, a second magnetic part and a third magnetic part, the first magnetic part, the second magnetic part and the third magnetic part are fixedly arranged on one side, facing the upper vibrating diaphragm, of the clamping plate, the second magnetic part surrounds the first magnetic part, an inner magnetic gap is formed between the first magnetic part and the second magnetic part, the third magnetic part surrounds the second magnetic part, an outer magnetic gap is formed between the second magnetic part and the second magnetic part, the third magnetic part is provided with a leakage channel communicated with the outer magnetic gap and the leakage hole, the upper voice coil is inserted into the inner magnetic gap, the lower voice coil is inserted into the outer magnetic gap, and an avoidance hole for avoiding the framework is arranged in a position, facing the outer magnetic gap, of the clamping plate in a penetrating mode.

2. The speaker box of claim 1, wherein the third magnetic part is composed of a plurality of third permanent magnets disposed around the second magnetic part, and two adjacent third permanent magnets are disposed at intervals, wherein two adjacent third permanent magnets are disposed at intervals to form the leakage path.

3. A loudspeaker enclosure according to claim 1 or claim 2, wherein the second magnetic part is a second permanent magnet, the second permanent magnet being in the form of a continuous ring-like structure.

4. The speaker box of claim 1, wherein the frame includes a main body portion connected to the lower diaphragm and a plurality of connecting portions extending from the main body portion toward the clamping plate and passing through the avoiding hole, and the connecting portions are connected to the lower voice coil.

5. The speaker box as claimed in claim 4, wherein the lower voice coil is a rounded rectangle, the number of the connecting portions is four, and four of the connecting portions are connected to four rounded corners of the lower voice coil in a one-to-one correspondence.

6. The speaker box of claim 4, wherein the vibration system further comprises an upper dome and a lower dome disposed in the accommodating space, opposite sides of the upper dome in the vibration direction are respectively connected to the upper diaphragm and the upper voice coil, and opposite sides of the lower dome in the vibration direction are respectively connected to the main body and the lower diaphragm.

7. The loudspeaker box of claim 1, wherein a first pole core is fixed on a side of the first magnetic part away from the clamping plate, a second pole core is fixed on a side of the second magnetic part away from the clamping plate, a third pole core is fixed on a side of the third magnetic part away from the clamping plate, and the clamping plate is made of soft magnetic material.

8. The loudspeaker box of claim 1, wherein the sound producing device further comprises an upper end cover and a lower end cover, the upper diaphragm clamp is arranged between the basin frame and the upper end cover, the upper end cover is provided with a first sound producing hole for the upper diaphragm to produce sound outwards, the lower diaphragm clamp is arranged between the basin frame and the lower end cover, and the lower end cover is provided with a second sound producing hole for the lower diaphragm to produce sound outwards.

9. The speaker box of claim 8, wherein the box body includes an upper bottom surface opposite to and spaced apart from the upper cover and a lower bottom surface opposite to and spaced apart from the lower cover, the upper bottom surface having a plurality of first pads supporting the upper cover, the lower bottom surface having a plurality of second pads supporting the lower cover.