A sound cavity structure and combination method for testing speaker performance

Abstract

The present invention discloses a sound cavity structure and a combination method for testing speaker performance. The sound cavity structure includes a cover and a base. The cover has a certain internal space by increasing the thickness of the cover plate and digging out a part of the cover plate, thereby forming a cover body rear cavity; the base includes a base rear cavity, and the cover body rear cavity and the base rear cavity form a rear cavity of the sound cavity structure; the rear cavity volume of the sound cavity is equal to the volume of the cover body rear cavity plus the volume of the base rear cavity. The combination method is to change the sound cavity structure of the original standard sound cavity test, and use a plurality of covers of different volumes and bases of the same volume for combination, so that the rear cavity volume of the formed sound cavity structure is variable. The present invention can improve the problem of inconsistent simulation results caused by the fixed rear cavity volume of the sound cavity design in the prior art. The present invention has strong practicality, compact structure, and convenient testing.

Description

Technical Field

[0001] The present invention relates to the field of acoustics, and in particular to a sound cavity structure and a combination method for testing speaker performance. Background Art

[0002] In the current acoustics field, when performing performance testing on speakers (SPK), baffle testing or standard acoustic cavity (also known as BOX) testing is generally used to obtain the SPK's frequency response characteristic curve and various parameters.

[0003] Figure 1 This is a schematic diagram of the baffle test in the prior art. Figure 1 As shown, the baffle test is to connect a hard flat plate to the circumference of the SPK paper cone. The sound waves on the back of the SPK paper cone must first bypass the flat plate before they can meet and interfere with the sound waves on the front of the paper cone. The frequency response characteristic curve and various parameters are then obtained through special testing equipment.

[0004] Baffle testing generally uses "offset installation" to make the path lengths of sound waves from the back of the SPK cone to each side unequal, thereby reducing attenuation caused by interference.

[0005] However, attenuation still exists, and when developing SPK for mobile phones and other electronic products, the baffle test requires a larger baffle, which can easily cause interference of sound waves in front and behind the paper cone, resulting in an "acoustic short circuit", making the sound smaller and the sound quality worse. It is not convenient for testing and does not simulate the cavity environment well.

[0006] The standard BOX test is an improvement to the baffle test. It completely seals the SPK cone into a rear cavity, isolating the front and rear cavities. This completely isolates the front and rear sound waves of the SPK, avoiding interference and weakening of the front and rear sound waves. It can also simulate the actual SPK working environment of electronic products such as mobile phones.

[0007] Figure 2a and Figure 2b They are respectively a schematic diagram of a standard BOX test in the prior art and a partial schematic diagram of a BOX structure of a standard BOX test in the prior art.

[0008] like Figure 2a and Figure 2b As shown in the figure, the BOX structure in the standard BOX test includes a cover 1 and a base 2, and the internal space of the base 2 forms a back cavity 3, and there are also several sound holes 4 in the base 2, wherein the cover 1 is a thin plate.

[0009] Therefore, the volume of the back cavity is fixed and cannot be changed. However, when designing actual electronic products, the volume of the back cavity may be far different from the standard BOX design and cannot be well simulated. Summary of the Invention

[0010] The purpose of the present invention is to provide a sound cavity structure and combination method for testing speaker performance. The volume of the back cavity of the sound cavity formed by replacing covers of different volumes is variable, which can improve the problem of inconsistent simulation results caused by the fixed back cavity volume of the standard sound cavity structure design in the prior art, and has strong practicality.

[0011] The present invention provides a sound cavity structure for testing speaker performance, the sound cavity structure comprising:

[0012] The cover is connected to a base; the base is used to fix and support the speaker to be tested, and a base rear cavity is formed inside the base;

[0013] A cover body rear cavity of a set volume is formed inside the cover; the cover body rear cavity is connected to the base rear cavity to form the rear cavity of the acoustic cavity structure.

[0014] Preferably, the base includes a plurality of sound holes;

[0015] The sound outlet is correspondingly arranged below the speaker;

[0016] After the speaker is installed above the sound outlet, all the hollow parts in the base form the base rear cavity.

[0017] Preferably, the cover comprises a plurality of screw holes;

[0018] The lower end of the cover is connected to the upper end of the base through the screw holes and screws.

[0019] Preferably, a cover edge of the cover is provided around the rear cavity of the cover;

[0020] A base edge of the base is provided at the periphery of the base rear cavity;

[0021] The edge of the cover is sealed to the edge of the base;

[0022] The cover is fixedly connected to the base through a plurality of auxiliary fixing members on the periphery of the edge of the cover body.

[0023] Preferably, the cover further includes a speaker fixing piece, which is in contact with the magnetic steel of the speaker; the hollow portion remaining after the speaker fixing piece is formed in the cover serves as the rear cavity of the cover body.

[0024] Preferably, the base further comprises a plurality of fixing ribs for fixing the speaker;

[0025] The speaker is arranged between the plurality of fixing ribs.

[0026] Preferably, the base further includes a front cavity, which is the internal space between the speaker diaphragm and the sound outlet.

[0027] Preferably, the base further comprises: a compressible front cavity foam separating the front cavity and the rear cavity; and a compressible rear cavity foam sealing the rear cavity.

[0028] Preferably, the front cavity foam is arranged above the sound outlet hole and wraps around the periphery of the sound outlet hole.

[0029] Preferably, the back cavity foam is arranged between the cover and the base, and wrapped around the periphery of the back cavity.

[0030] The present invention also provides a combination method applicable to the sound cavity structure described above, which is: select any one of multiple covers, each with a cover back cavity of different volumes, connect and combine it with a base with a base back cavity of a fixed volume, and test the speaker placed in the base.

[0031] Preferably, the multiple covers, each having a cover body rear cavity of a different volume, have different cover thicknesses.

[0032] Preferably, the multiple covers, each having a cover body rear cavity of a different volume, are formed by digging out cover plate portions of different depths inside the cover.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] (1) The front and rear cavities of the acoustic cavity structure are isolated, and under the premise of good sealing, there will be no sound interference attenuation;

[0035] (2) The acoustic cavity structure is compact and convenient for testing;

[0036] (3) The volume of the back cavity of the acoustic cavity structure can be changed by selecting different covers, and different combinations can be selected according to the actual situation of the SPK of electronic devices such as mobile phones;

[0037] (4) The same set of covers of different volumes can be used to measure different speakers of the same height, which is very practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Schematic diagram of baffle test in the prior art;

[0039] Figure 2a Schematic diagram of the overall BOX structure of the standard BOX test in the prior art;

[0040] Figure 2b A partial schematic diagram of the BOX structure of a standard BOX test in the prior art;

[0041] Figure 3a An external schematic diagram of the cover of the BOX structure of the present invention;

[0042] Figure 3b A schematic diagram of the interior of the cover of the BOX structure of the present invention;

[0043] Figure 4 Schematic diagram of the cover and base of the present invention being disassembled;

[0044] Figure 5 A schematic diagram of the base structure after the speaker is installed in the present invention;

[0045] Figure 6 Schematic diagram of the BOX structure combination of the present invention;

[0046] Figure 7 A schematic diagram of the front cavity foam of the present invention;

[0047] Figure 8 A schematic diagram of the back cavity foam of the present invention;

[0048] Figure 9 Schematic diagram of the connection of the components of the BOX structure of the present invention.

[0049] Among them: 1. Cover; 2. Base; 3. Back cavity; 3-1. Cover back cavity; 3-2. Base back cavity; 4. Sound hole; 5. Speaker; 6. Front cavity foam; 7. Back cavity foam; 8. Speaker fixings; 9. Fixing ribs; 10. Screw holes; 11. Front cavity; 12. Cover edge; 13. Base edge; 14. Auxiliary fixings. DETAILED DESCRIPTION

[0050] The present invention provides a sound cavity structure and a combination method for testing speaker performance. To make the present invention more clear and easy to understand, the present invention is further described below with reference to the accompanying drawings and specific implementation methods.

[0051] Figure 6 It is a schematic diagram of the BOX structure combination of the present invention.

[0052] like Figure 6 As shown, the BOX structure (acoustic cavity structure) for testing speaker performance of the present invention includes a cover 1 and a base 2. The lower end of the cover 1 is connected to the upper end of the base 2, and the combined connection forms the BOX structure of the present invention.

[0053] Figure 3a and Figure 3b They are respectively an external schematic diagram of the cover of the BOX structure of the present invention and an internal schematic diagram of the cover of the BOX structure of the present invention.

[0054] like Figure 3a and Figure 3bAs shown in the figure, by increasing the thickness of the cover plate and removing a portion of the inner portion of the cover plate, leaving a portion in the middle, the speaker fixing member 8 is formed. At the same time, the cover edge 12 is left around, which can be in contact with the base 2 to achieve sealing. The remaining internal hollow space of the cover 1 forms the cover rear cavity 3-1.

[0055] A screw hole 10 is provided at each of the four end points around the cover 1. When the cover 1 and the base 2 are assembled and connected, a screw is provided at each of the screw holes 10 to connect and fix the cover 1 and the base 2.

[0056] Figure 4 This is a schematic diagram of the cover and base being disassembled according to the present invention. Figure 5 This is a schematic diagram of the base structure after the speaker is installed in the present invention. Figure 9 It is a schematic diagram of the connection of the components of the BOX structure of the present invention.

[0057] like Figure 4 、 Figure 5 and Figure 9 As shown in the figure, the base 2 is provided with a speaker 5, which can emit sound.

[0058] Since the speaker fixing member 8 of the cover 1 is formed by removing a portion of the cover plate, the speaker fixing member 8 is raised compared to the surface of the cover rear cavity 3-1 surrounding the speaker fixing member 8. The speaker fixing member 8 is in contact with the magnet of the speaker 5 via the raised portion.

[0059] Since the speaker fixing member 8 is used to fix the speaker 5, it needs to match the shape and size of the speaker 5. Therefore, when designing the cover 1, in addition to considering the volume of the rear cavity 3-1 of the cover body, it is also necessary to determine the position and depth of the excavation on the cover according to the shape of the speaker fixing member 8.

[0060] The base 2 further includes four fixing ribs 9 for fixing the speaker 5. The four fixing ribs 9 are evenly arranged at the four end points of the square front cavity foam 6. The speaker 5 is arranged between the four fixing ribs 9.

[0061] The base 2 further includes a plurality of sound holes 4 , which are arranged below corresponding positions of the speakers 5 so that sound waves can be transmitted smoothly.

[0062] The present invention adopts a sound outlet hole 4 with a smooth transition, which can ensure that the sound is not harsh and avoid sharp corners and acute angles, otherwise abnormal noise is likely to be generated.

[0063] The shape of the sound hole 4 can be circular, square or other shapes. Other internal designs of the present invention should also be smooth and avoid sharp corners as much as possible, otherwise abnormal noises will be easily generated.

[0064] Because the area of ​​the sound outlet 4 affects all frequency bands of the frequency response curve, it mainly affects the high-frequency cutoff frequency and the sensitivity of the mid- and low-frequency.

[0065] If the area of ​​the sound hole 4 is too large, it will cause excessive high-frequency noise, the sound will appear sharper, and the sound will sound harsher. If the area of ​​the sound hole 4 is too small, the sound will be too small.

[0066] For example, if the sound hole 4 is circular, the diameter of the circle can be set to be larger than 1 mm; if the sound hole 4 is square, the side length of the square can be set to be at least larger than 1 mm.

[0067] The positions and uniformity of the openings of the sound holes 4 will also have a certain impact on the sound, and the degree of the impact is related to the volume of the front cavity 11 .

[0068] The entire hollow interior space of the base 2 after the speaker 5 is installed is the base rear cavity 3-2. Figure 5 shown.

[0069] After the cover 1 and the base 2 are combined and connected, the overall internal space after the base rear cavity 3-2 and the cover body rear cavity 3-1 are connected forms the rear cavity 3 of the present invention, that is, the sum of the volume of the base rear cavity 3-2 and the volume of the cover body rear cavity 3-1 is equal to the volume of the rear cavity 3.

[0070] Therefore, the volume of the rear cavity 3 of the present invention is larger than that of the standard BOX in the prior art which only includes the base rear cavity 3-2.

[0071] The base 2 of the present invention is further provided with a rear cavity foam 7 , which can separate the rear cavity 3 from the outside, that is, the rear cavity foam 7 plays a role in sealing the rear cavity 3 .

[0072] Because whether the rear cavity 3 is effectively sealed has a great influence on the low-frequency part of the sound. If the rear cavity 3 is not sealed well and leaks occur, the low frequency will be attenuated, causing damage to the sound quality.

[0073] The extent of its impact is related to the leakage area and location.

[0074] Under the same leakage area, if the volume of the rear cavity 3 is smaller, the low-frequency attenuation is more severe, that is, the damage caused by the leakage is greater. Therefore, the larger the volume of the rear cavity 3 of the present invention, the smaller the damage caused by the leakage.

[0075] The back cavity foam 7 is arranged between the cover 1 and the base 2 and wrapped around the periphery of the back cavity 3. The back cavity foam 7 has a certain amount of compression. Therefore, when the cover 1 and the base 2 are assembled and connected, the back cavity foam 7 can play a role of sealing all around.

[0076] Figure 8The back cavity foam of the present invention is a schematic diagram. The back cavity foam 7 matches the shape of the frame of the base 2. It can be a square frame structure with an extension section on one side, such as Figure 8 shown.

[0077] If the rear cavity 3 cannot be completely sealed, the volume of the rear cavity 3 should be as large as possible, which can reduce the negative impact caused by the poor sealing of the rear cavity 3. Therefore, the BOX structure of the present invention is more practical and more adjustable.

[0078] The base 2 further includes a front cavity 11 and a front cavity foam 6 .

[0079] The space between the speaker diaphragm and the sound outlet 4 forms a front cavity 11. The front cavity 11 is located at the upper end of the sound outlet 4 and at the lower end of the speaker 5.

[0080] The main function of the front cavity 11 is to correct the mid-high frequency of the sound, so that the sound produces a cutoff frequency in the high frequency band and a relatively high frequency peak.

[0081] The front cavity 11 can improve the mid-low frequency, reduce the high-frequency noise, reduce the high-frequency band extension and improve the sound conversion efficiency.

[0082] The volume of the front cavity 11 is generally set to be small; and generally, the larger the volume of the front cavity 11 is, the smaller the influence of the position and uniform distribution of the openings of the sound holes 4 on the sound will be.

[0083] Therefore, the height of the front cavity can be set to 1.5 mm to 3.5 mm on the basis of ensuring that the sound waves are clean and clear.

[0084] The front cavity foam 6 is arranged on the periphery above the sound outlet 4, and the front cavity foam 6 also has a certain amount of compression.

[0085] The front cavity foam 6 is used to seal the front cavity 11 so that the front cavity 11 and the rear cavity 3 are in an isolated state.

[0086] Figure 7 Schematic diagram of the front cavity foam of the present invention, the shape of the front cavity foam 6 matches the shape of the frame of the speaker 5, which can be a square frame structure, such as Figure 7 shown.

[0087] Because the thickness of the cover 1 of the present invention determines the size of the internal space of the cover, the cover 1 with cover cavities 3 - 2 of various volumes can be designed by changing the thickness of the cover 1 .

[0088] When a cover 1 with a different volume of the cover back cavity 3 - 1 is used and combined with the base 2 , a BOX structure containing back cavities 3 of different volumes is obtained.

[0089] For example, the internal space of the base rear cavity 3-2 of the base 2 is 0.6 cm 3 The internal space of the rear cavity 3-1 of the cover 1 is 0.2 cm 3 , then the cover 1 and the base 2 are combined and connected. Then, according to the BOX structure of the present invention described above, the volume of the rear cavity 3 is equal to the sum of the volume of the base rear cavity 3-2 and the volume of the cover rear cavity 3-1, that is, the volume of the rear cavity 3 is 0.8 cm 3 BOX structure.

[0090] If the internal space of the rear cavity 3-1 of the cover body is changed to 0.3cm 3 The volume of the cover 1 and the base rear cavity 3-2 is 0.6cm 3 The volume of the rear cavity 3 of the BOX structure of the present invention is equal to the volume of the rear cavity 3-2 of the base plus the volume of the rear cavity 3-1 of the cover, that is, the volume of the rear cavity 3 is 0.9 cm 3 BOX structure.

[0091] If the internal space of the rear cavity 3-1 of the cover body is replaced, it will be 0.4cm 3 The volume of the cover 1 and the base rear cavity 3-2 is 0.6cm 3 The volume of the rear cavity 3 of the BOX structure of the present invention is equal to the volume of the rear cavity 3-2 of the base plus the volume of the rear cavity 3-1 of the cover, that is, the volume of the rear cavity 3 is 1.0 cm 3 BOX structure.

[0092] Alternatively, the interior space of the base rear cavity 3-2 of the base 2 is 0.8 cm 3 The internal space of the rear cavity 3-1 of the cover 1 is 0.2 cm 3 , then the cover 1 and the base 2 are combined and connected. Then, according to the BOX structure of the present invention described above, the volume of the rear cavity 3 is equal to the sum of the volume of the rear cavity 3-2 of the base and the volume of the rear cavity 3-1 of the cover, that is, the volume of the rear cavity 3 is 1.0 cm 3 BOX structure.

[0093] If the internal space of the rear cavity 3-1 of the cover body is changed to 0.3cm 3 The volume of the cover 1 and the base rear cavity 3-2 is 0.8 cm 3 The volume of the rear cavity 3 of the BOX structure of the present invention is equal to the volume of the rear cavity 3-2 of the base plus the volume of the rear cavity 3-1 of the cover, that is, the volume of the rear cavity 3 is 1.1 cm 3 BOX structure.

[0094] If the internal space of the rear cavity 3-1 of the cover body is replaced, it will be 0.4cm 3The volume of the cover 1 and the base rear cavity 3-2 is 0.8 cm 3 The volume of the rear cavity 3 of the BOX structure of the present invention is equal to the volume of the rear cavity 3-2 of the base plus the volume of the rear cavity 3-1 of the cover, that is, the volume of the rear cavity 3 is 1.2 cm 3 BOX structure.

[0095] Specific data before and after the combination are shown in Table 1 below, wherein Table 1 is a table of combined data of covers and bases of different volumes of the BOX structure of the present invention.

[0096] Therefore, different thicknesses of the cover 1 can be used according to the requirements of the BOX structure with different cavity volumes. However, the thinnest part of the cover 1 must be at least larger than 2 mm, mainly to ensure the strength of the structure.

[0097] Alternatively, when the cover 1 of the same thickness is selected, the cover body rear cavities 3 - 1 of different volumes can be formed by digging out cover plates of different volumes in the cover 1 , and then the cover 1 and the base 2 are combined and connected.

[0098] The method for combining and connecting the cover 1 and the base 2 is as follows:

[0099] Directly close the cover 1 on the upper end of the base 2, and connect the cover edge 12 with the base edge 13 provided around the base rear cavity 3-2 to achieve sealing;

[0100] Set the screws at the positions corresponding to the screw holes 10 and tighten the screws;

[0101] Two auxiliary fixing members 14 are provided on the periphery of the cover body edge 12 of the cover 1 , which are matched with the corresponding positions of the base 2 to perform auxiliary fixing so that the cover 1 and the base 2 are assembled and connected.

[0102] Table 1 Data table of arbitrary combinations of covers and bases of different volumes of the BOX structure of the present invention

[0103] <![CDATA[Volume of the rear cavity of the base (cm 3 )]]> <![CDATA[Volume of the rear cavity of the cover body (cm 3 )]]> <![CDATA[Volume of the rear cavity of the BOX structure (cm 3 )]]> 0.6 0.2 0.8 0.6 0.3 0.9 0.6 0.4 1.0 0.8 0.2 1.0 0.8 0.3 1.1 0.8 0.4 1.2

[0104] When the depth of the cover cavity 3-1 is the same, different types of speakers 5 can also be used, so the present invention has strong applicability. The shape of the speaker 5 can be a square structure or other shapes.

[0105] For different speakers 5, the volume of the rear cavity 3 must be greater than the minimum rear cavity threshold, because the main function of the rear cavity 3 is to correct low frequencies.

[0106] When the volume of the rear cavity 3 of the BOX increases, within a certain range, the low-frequency resonance frequency of the sound waves emitted by the speaker 5 will increase.

[0107] If the volume of the back cavity 3 is small, the sound quality is poor, and the sound appears dry, harsh and noisy. Therefore, the volume of the back cavity 3 of the BOX of the present invention is increased, and the sound quality is better than that of the prior art.

[0108] The present invention may also include leak holes.

[0109] The leakage hole can make the air pressure inside and outside the BOX of the present invention equal, avoiding the failure of the eardrum, the deflation of the membrane, etc. The larger the area of ​​the leakage hole, the greater its impact on the low frequency of the sound wave.

[0110] The position between the leak hole and the speaker 5 affects the sound:

[0111] If the leakage hole is close to the speaker 5, the frequency response curve will drop in the low frequency, making the sound sharp and lacking bass;

[0112] If the leakage hole is far away from the speaker 5, the frequency response curve is not significantly affected, so the sound is also not significantly affected.

[0113] The smaller the volume of the back cavity 3 of the BOX of the present invention, the greater the impact of the leakage hole on the BOX. Therefore, the larger the volume of the back cavity 3 of the BOX of the present invention, the less adverse impact of the leakage hole design on the BOX test can be.

[0114] The present invention may also include a dust screen, which has a relatively smaller impact on the sound than the above-mentioned rear cavity 3, front cavity 11, sound outlet 4 and speaker 5. The dust screen has two main functions: to prevent dust and to reduce low-frequency peaks.

[0115] The dust screen primarily affects the low-frequency and high-frequency peaks of the frequency response curve, with the low-frequency peak having a greater impact. The extent of the dust screen's impact on sound depends primarily on its acoustic resistance and the magnitude of the low-frequency and high-frequency peaks.

[0116] Generally speaking, the larger the peak value, the greater the attenuation caused by the dust screen.

[0117] The present invention can use a dustproof net made of a mesh cloth with a relatively low acoustic resistance value, which can be below 10Ω, so the impact on the sound is very small.

[0118] Mesh dust screens offer better consistency in acoustic resistance than standard non-woven dust screens. Because non-woven dust screens have varying densities in different areas, their acoustic resistance also varies, potentially resulting in poor consistency across the same batch of dust screens.

[0119] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description is not intended to limit the present invention. After reading the above description, various modifications and substitutions of the present invention will become apparent to those skilled in the art. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A sound cavity structure for testing speaker performance, characterized in that: The sound cavity structure includes: A cover (1) connected to a base (2); the base (2) is used to fix and support the speaker (5) to be tested, and a base rear cavity (3-2) is formed inside the base (2); A cover body rear cavity (3-1) of a set volume is formed inside the cover (1); the cover body rear cavity (3-1) and the base rear cavity (3-2) are connected to form a rear cavity (3) of the acoustic cavity structure; The base (2) comprises a plurality of sound outlet holes (4); The sound outlet hole (4) is correspondingly arranged below the speaker (5); After the speaker (5) is installed above the sound outlet (4), all hollow parts in the base (2) form the base rear cavity (3-2); The cover (1) further comprises a speaker fixing member (8) which is in contact with the magnetic steel of the speaker (5); the hollow portion remaining after the speaker fixing member (8) is formed in the cover (1) serves as the cover body rear cavity (3-1); The cover (1) comprises a plurality of screw holes (10); The lower end of the cover (1) is connected to the upper end of the base (2) through the screw hole (10) and the screw; A cover body edge (12) of the cover (1) is provided around the rear cavity (3-1) of the cover body; A base edge (13) of the base (2) is provided at the periphery of the base rear cavity (3-2); The cover edge (12) is sealedly connected to the base edge (13); The cover (1) is fixedly connected to the base (2) via a plurality of auxiliary fixing members (14) on the periphery of the cover body edge (12); The base (2) further comprises a plurality of fixing ribs (9) for fixing the speaker (5); The speaker (5) is arranged between the plurality of fixed ribs (9); The base (2) further comprises a front cavity (11), which is the internal space between the speaker diaphragm and the sound outlet (4); The base (2) further comprises: A compressible front chamber foam (6) separating the front chamber (11) and the rear chamber (3); A compressible rear cavity foam (7) for sealing the rear cavity (3); The front cavity foam (6) is arranged above the sound outlet hole (4) and wraps around the periphery of the sound outlet hole (4); The rear cavity foam (7) is arranged between the cover (1) and the base (2), and is wrapped around the periphery of the rear cavity (3); Any one of the multiple covers (1) each having a cover body rear cavity (3-1) of different volumes is selected and connected and combined with a base (2) having a base rear cavity (3-2) of a fixed volume.

2. A method for assembling the acoustic cavity structure according to claim 1, characterized in that: The combination method comprises: selecting any one of a plurality of covers (1) each having a cover body rear cavity (3-1) of different volumes, connecting and combining the covers with a base (2) having a base rear cavity (3-2) of a fixed volume, and testing a speaker (5) placed in the base (2).

3. A method for combining a sound cavity structure according to claim 2, characterized in that: The multiple covers (1), each having a cover body rear cavity (3-1) of different volumes, have different cover (1) thicknesses.

4. A method for combining a sound cavity structure according to claim 3, characterized in that: The multiple covers (1), each having a cover body rear cavity (3-1) of different volumes, are formed by digging out cover plate portions of different depths in the cover (1).

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