A headphone with bass self-adjustment

Abstract

Specifically, this invention relates to a user-adjustable bass monitoring headphone, comprising: a speaker, a front acoustic cavity, and a rear acoustic cavity, the speaker and the rear acoustic cavity forming a rear chamber; a sound guide tube with an arc-shaped groove structure is provided on the rear side of the rear acoustic cavity; a first sound guide hole is provided at one end of the sound guide tube, the first sound guide hole passing through the rear side of the rear acoustic cavity and communicating with the rear chamber; a bass adjuster located on the rear side of the rear acoustic cavity has a second sound guide hole passing through its front and rear sides; the bass adjuster rotates relative to the rear acoustic cavity, causing the second sound guide hole to rotate along the center line of the sound guide tube, adjusting the relative position between the sound guide holes, which together form the rear resonant cavity of the speaker; the volume of the rear resonant cavity can be changed by adjusting the size of the variable gap. The advantages of this invention are: precise control of low-frequency response and high-fidelity sound quality reproduction using a gradually expanding arc sound guide tube and a rotatable bass adjuster.

Description

Technical Field

[0001] This utility model relates to the field of receiver technology, specifically to a headset with adjustable bass that the user can use. Background Technology

[0002] The low-frequency response of current headphones is determined by the speaker unit and the fixed-volume acoustic rear cavity. The larger the cavity, the more relaxed and full the low frequencies, and vice versa. Most current products use a fixed rear cavity, which users cannot adjust as needed. Although electrical signal compensation can be used, it is prone to distortion and reduced resolution, and cannot change the physical resonance characteristics. A few solutions allow for indirect fine-tuning by changing the ear pads or opening / closing the vents, but their effectiveness is limited and inconvenient. Monitoring-grade applications demand even higher precision in low-frequency control and high-fidelity reproduction, and the fixed cavity structure cannot meet personalized needs. Therefore, there is an urgent need for headphones that allow users to adjust the bass independently, without electronic processing, solely through the physical structure. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a pair of over-ear monitoring headphones with adjustable bass, so as to achieve precise control of low frequency response and high-fidelity sound reproduction.

[0004] To achieve the above objectives, a user-adjustable bass monitoring headphone is designed, comprising: a speaker, an acoustic front cavity disposed in front of the speaker, and an acoustic rear cavity disposed behind the speaker, wherein the acoustic rear cavity is an open-front enclosure structure, and the rear side of the speaker is disposed at the open end and cooperates with the acoustic rear cavity to form a closed, surrounding rear chamber; a sound guide tube is provided on the rear side of the acoustic rear cavity, and the sound guide tube is an arc-shaped groove structure; a first sound guide hole is provided at one end of the sound guide tube, the first sound guide hole penetrating the rear side of the acoustic rear cavity and communicating with the rear chamber; further comprising: a bass adjuster disposed on the rear side of the acoustic rear cavity, the front side of the bass adjuster being connected to the front side of the acoustic rear cavity; and a bass adjuster disposed on the rear side of the acoustic rear cavity. The rear side of the acoustic rear cavity is fitted and cooperates with the sound guide tube to form a closed sound guide cavity; the bass adjuster is provided with a second sound guide hole that runs through its front and rear sides, and the second sound guide hole is set on the bass adjuster at a position corresponding to the center line of the sound guide tube; the bass adjuster rotates relative to the acoustic rear cavity, thereby driving the second sound guide hole to rotate along the center line of the sound guide tube, thereby adjusting the relative position between the first sound guide hole and the second sound guide hole to form a variable gap between them; the variable gap is connected to the rear cavity, together forming the rear resonant cavity of the speaker, and by adjusting the size of the variable gap, the volume of the rear resonant cavity is changed, thereby realizing the adjustment of the low-frequency resonance effect of the speaker.

[0005] Preferably, the present invention further includes: the sound guide tube is a gradually expanding arc-shaped extension groove, the width of which gradually increases from one end to the other end, the entire length of which is defined by an arc with a constant radius of curvature, the sidewalls expanding asymmetrically from one end to the other end, so that the groove width monotonically increases along the arc length direction, and the expansion amplitude changes continuously and smoothly in any cross section, and the whole is integrally formed; the first sound guide hole is provided at the narrowest end of the arc-shaped extension groove.

[0006] Preferably, the present invention further includes: a rotating nut provided in the middle of the rear side of the acoustic rear cavity, a rotating screw fixed in the middle of the bass adjuster, one end of the rotating screw extending from the front side of the bass adjuster and cooperating with the rotating nut, and the bass adjuster being rotated by turning the rotating screw, thereby realizing the position adjustment of the second sound guide hole relative to the first sound guide hole.

[0007] Preferably, the present invention further includes: the minimum variable gap position between the first sound guide hole and the second sound guide hole is when the two are coaxially aligned, and the maximum variable gap position is when the second sound guide hole is located at the farthest point from the first sound guide hole on the sound guide tube.

[0008] Preferably, the present invention further includes: the acoustic front cavity is a plate-shaped structure with several through grooves for sound propagation in front of the speaker; the rear side of the acoustic front cavity is provided with a circular step structure for supporting the speaker and forming a front chamber between the speaker and the acoustic front cavity.

[0009] Preferably, the present invention further includes: a rear cover is provided on the rear side of the bass adjuster, the rear cover is connected to the acoustic front cavity through a bracket to form an enclosed structure, and the bass adjuster, the acoustic rear cavity, and the speaker are sequentially arranged in the enclosed structure.

[0010] Preferably, the present invention further includes: an opening on the back cover corresponding to the position of the rotating screw, for the user to turn the rotating screw to adjust the bass.

[0011] Preferably, the present invention further includes: a limiting groove is provided on the rear side of the bass adjuster, and a limiting block is provided on the front side of the rear cover. The limiting groove is an arc-shaped groove, the length and curvature of which are the same as the arc extension groove of the sound guide tube. The limiting block is engaged in the limiting groove and slides to limit the rotation stroke of the bass adjuster.

[0012] Preferably, the present invention further includes: a slope is provided on the periphery of the rear side of the bass adjuster, the slope and the sound guide tube form an avoidance structure, and a plurality of through grooves are evenly distributed on the slope to eliminate standing wave conditions in the headphones and reduce structural weight.

[0013] Preferably, the present invention further includes: a plurality of countersunk holes are provided on the acoustic rear cavity, and the fixing screws pass through the countersunk holes and cooperate with the screw posts on the acoustic front cavity to realize the fixed connection between the acoustic rear cavity and the acoustic front cavity.

[0014] Compared with the prior art, the advantages of this utility model are: This application utilizes a gradually expanding arc-shaped sound guide tube and a rotatable bass adjuster to continuously change the distance between the first and second sound guide holes, thereby altering the effective volume of the rear chamber. This allows for stepless adjustment of the low-frequency resonant air volume within the rear chamber, enabling the low-frequency resonant frequency to shift downwards or upwards. This results in a bass response and depth that can be adjusted blindly with one hand, without disassembly, electronic components, or additional distortion. The sound guide tube is integrally molded with a smoothly expanding groove width, ensuring uniform airflow deceleration, suppressing eddy noise, and extending the sound path with an arc. This achieves a larger effective cavity variation range within a limited thickness, enhancing the adjustment amplitude. The rotating screw and nut are coaxially positioned, ensuring a precise seal at the contact surface and eliminating the need for additional sealing rings. A limiting groove locks the travel within the effective arc range, preventing misalignment and extending lifespan. The rear cover only exposes the screw heads, resulting in a clean appearance and allowing for quick switching of monitoring curves in stage and recording studio settings. No reset is required after adjustment. Physical damping optimizes diaphragm amplitude, reduces breakup vibration, and improves mid-to-high frequency purity simultaneously. While maintaining a size and weight comparable to traditional fixed-cavity products, it achieves wide-range, continuous, and stepless bass adjustment, balancing professional high-fidelity monitoring with personalized listening experience. Attached Figure Description

[0015] Figure 1 This is an exploded view of the structure of this utility model; Figure 2 This is a schematic diagram of the bass regulator and acoustic rear cavity structure of this utility model; Figure 3 This is a schematic diagram of the frequency response curve of the bass variation of this utility model; In the diagram: 1. Acoustic front cavity, 1-1. Circular step, 2. Speaker, 3. Acoustic rear cavity, 3-1. First sound guide hole, 3-2. Sound guide tube, 3-3. Rotary nut, 3-4. Countersunk hole, 4. Bass adjuster, 4-1. Second sound guide hole, 4-2. Rotary screw, 4-3. Limiting groove, 5. Rear cover, 6-1. Minimum gap position, 6-2. Maximum gap position. Detailed Implementation

[0016] To make the purpose, principle and structure of this utility model clearer, the following description is provided in conjunction with the accompanying drawings and specific embodiments.

[0017] This invention provides a pair of over-ear monitoring headphones with adjustable bass levels.

[0018] like Figure 1 , Figure 2As shown, this over-ear monitor headphone is arranged from front to back along the acoustic axis as follows: acoustic front cavity 1, speaker 2, acoustic rear cavity 3, bass adjuster 4, and rear cover 5. These five components are assembled sequentially using screws and snap-fit ​​mechanisms to form a closed acoustic system. The acoustic front cavity 1 is a circular panel molded from engineering plastic. Several through slots are evenly distributed on the front surface of the panel to directly guide the mid-to-high frequency sound waves radiated from the front of the speaker 2 into the headphones. The rear surface of the panel has a concentric circular step structure 1-1. The inner diameter of the circular step 1-1 is fitted with a clearance fit to the outer diameter of the front of the speaker 2, thus pressing and fixing the periphery of the speaker 2 diaphragm. Simultaneously, a front cavity with a certain gap is left between the front surface of the circular step 1-1 and the speaker 2 panel, providing a short-distance reflection channel for high frequencies and enhancing the clarity of mid-to-high frequencies.

[0019] The speaker 2 uses a common dynamic driver unit, with its diaphragm facing forward and the magnetic circuit system facing backward. Sound radiation from the front and rear sides enters the front and rear chambers, respectively. The acoustic rear chamber 3 is a basin-shaped structure with an open front side. The basin's end face fits against the rear end face of the speaker 2, and six countersunk holes 3-4 are evenly distributed around its circumference. These holes are secured to the screw posts on the acoustic front chamber 1 with self-tapping screws, forming a rigid connection. A sound guide tube 3-2 is integrally machined into the central area of ​​the rear sidewall of the acoustic rear chamber 3. The sound guide tube 3-2 is a gradually expanding arc-shaped extension groove with a constant radius of curvature along its centerline. The sidewall expands asymmetrically from the right end to the left end, with the groove width increasing monotonically. The entire tube is integrally formed with the rear sidewall without any seams. A circular first sound guide hole 3-1 is opened at the narrowest end of the sound guide tube 3-2, which passes through the rear side wall of the acoustic rear cavity 3 and communicates with the inner cavity of the acoustic rear cavity 3, and is used to introduce the sound waves from the rear cavity into the sound guide tube 3-2.

[0020] The bass adjuster 4 is a disc-shaped engineering plastic part with a flat front end that fits against the rear side wall of the acoustic rear cavity 3. The mating surfaces are machined to high precision, forming an airtight sliding pair that requires no additional sealing ring. The front end of the bass adjuster 4 mates with the corresponding open planar area of ​​the sound guide tube 3-2, together forming a closed sound guide cavity with a gradually changing cross-section. A second sound guide hole 4-1 is formed on the bass adjuster 4 at a position corresponding to the centerline of the sound guide tube 3-2. The diameter of the second sound guide hole 4-1 is the same as that of the first sound guide hole 3-1. Preferably, the opening of the second sound guide hole 4-1 can be chamfered to reduce airflow noise. A rotating screw 4-2 is injection-molded and embedded in the center of the bass adjuster 4. The front end of the rotating screw 4-2 is threaded into a rotating nut 3-3 fixed to the center of the rear side of the acoustic rear cavity 3. Both the rotating screw 4-2 and the rotating nut 3-3 are coaxially arranged with the central axis of the bass adjuster 4. When the user turns the screw clockwise or counterclockwise, the bass adjuster 4 rotates around its axis, and the second sound guide hole 4-1 slides along the center line of the sound guide tube 3-2, thereby changing its relative position with the first sound guide hole 3-1 and forming a variable gap from 0 to the maximum arc length. This gap is always connected to the rear chamber through the sound guide cavity of the sound guide tube 3-2, together forming the rear resonant cavity of the speaker 2. The larger the gap, the larger the equivalent cavity volume, the smaller the air damping, the greater the air compliance, the lower the low-frequency resonant frequency, and the stronger the bass; the smaller the gap, the smaller the equivalent volume, the greater the air damping, the higher the low frequency, and the weaker the bass, achieving stepless adjustment. When the second sound guide hole 4-1 is rotated to a position coaxial with the first sound guide hole 3-1, this is the minimum gap position 6-1 between the bass adjuster 4 and the acoustic rear cavity 3; when the second sound guide hole 4-1 is rotated to the position furthest from the first sound guide hole 3-1 inside the sound guide tube 3-2, this is the maximum gap position 6-2 between the bass adjuster 4 and the acoustic rear cavity 3.

[0021] To limit the rotational travel, the rear end face of the bass adjuster 4 has an arc-shaped limiting groove 4-3. The curvature of the limiting groove 4-3 is consistent with that of the sound guide tube 3-2, and the arc length corresponds to the effective groove length of the sound guide tube 3-2. A limiting block 5-1 is provided on the side of the rear cover 5 facing the bass adjuster 4. The limiting block 5-1 is inserted into the limiting groove 4-3, slidingly engaging. Shoulders at both ends limit the rotation angle of the bass adjuster 4, preventing excessive tightening that could lead to complete misalignment of the holes or thread stripping. A through hole is opened in the center of the rear cover 5. The head of the rotating screw 4-2 is recessed into the hole and does not connect with or limit the through hole, allowing for blind operation using a coin or a standard flathead screwdriver. The acoustic front cavity 1 is connected to the outer periphery of the rear cover 5 via several rearward-facing brackets. The bracket length leaves a safe gap between the bass adjuster 4 and the rear cover 5 to prevent collisions during rotation. The outer periphery of the bass adjuster 4 has an angled bevel with several evenly distributed through grooves to disrupt the internal parallel plane of the earphone, suppressing standing waves and reducing weight.

[0022] The actual adjustment process is as follows: The user can see the head of the rotating screw 4-2 through the through hole on the back cover 5; using a coin to wedge the rotating screw 4-2 into its slot, a slight clockwise rotation causes the bass adjuster 4 to rotate accordingly. The second sound guide hole 4-1 gradually moves away from the first sound guide hole 3-1, increasing the gap. The user immediately feels an increase in bass quantity and extension. Turning it in the opposite direction decreases the gap, rapidly tightening the bass and highlighting the mid-high frequency resolution. The entire movement is approximately 90 degrees, with uniform rotational torque and no jamming. After adjustment, the screw is self-locking and will not shift due to vibration.

[0023] Figure 3 The frequency response curves show that by simply changing the overlapping area and gap between the two sound holes by rotating the bass adjuster 4, a continuous rise and fall of about 9dB can be achieved in the 10-100Hz range, with smooth peaks and no distortion. This verifies the linear relationship of "physical expansion - resonant frequency shift - enhanced bass response", which can meet both the needs of accurate monitoring and personalized bass without the need for electronic EQ.

[0024] Since all adjustments involve only mechanical displacement, without the introduction of resistors, capacitors, or digital processing modules, there is no increase in harmonic distortion, and no power supply is required. The overall weight is comparable to traditional fixed-cavity headphones. The 3-2 gradually expanding structure of the sound guide tube gradually reduces the airflow speed, avoiding eddies caused by abrupt changes in the cross-section and ensuring pure low frequencies. The curved design extends the sound path, effectively increasing the cavity depth and achieving a greater adjustment range within a limited thickness. The limiting groove and limiting block work together to ensure that each adjustment is within a safe range, and the threads will not wear out with long-term use. The beveled through-slot design reduces internal parallel reflections. The overall structure is simple and reliable, and the assembly process is compatible with conventional headphones, making it suitable for mass production.

[0025] In summary, this embodiment achieves continuously variable rear cavity volume through the combination of a gradually expanding arc-shaped sound guide tube and a rotating hole. This allows users to perform stepless bass adjustment with one hand without disassembling the device or using electronic equalization, balancing the high-fidelity requirements of professional monitoring with personalized listening experiences. It solves the industry pain points of fixed cavities being unable to be adjusted and electronic adjustments being prone to distortion.

[0026] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and concept of this utility model, should be included within the protection scope of this utility model.

Claims

1. A user-adjustable bass monitoring headphone, comprising: A loudspeaker, an acoustic front cavity located at the front of the loudspeaker, and an acoustic rear cavity located at the rear of the loudspeaker. Its features are, The acoustic rear cavity is an enclosed structure with an open front side, and the rear side of the speaker is located at the open side and cooperates with the acoustic rear cavity to form a closed and encircling rear chamber. The acoustic rear cavity is provided with a sound guide tube, which has an arc-shaped groove structure. One end of the sound guide tube is provided with a first sound guide hole, which penetrates the rear side of the acoustic rear cavity and communicates with the rear side cavity. It also includes a bass regulator located on the rear side of the acoustic rear cavity, wherein the front side of the bass regulator is in contact with the rear side of the acoustic rear cavity and cooperates with the sound guide tube to form a closed sound guide cavity; The bass regulator is provided with a second sound guide hole that runs through its front and rear sides. The second sound guide hole is located on the bass regulator at a position corresponding to the center line of the sound guide tube. The bass regulator rotates relative to the acoustic rear cavity, thereby causing the second sound guide hole to rotate along the center line of the sound guide tube, and thus adjusting the relative position between the first sound guide hole and the second sound guide hole to form a variable gap between them. The variable gap is connected to the rear chamber, together forming the rear resonant cavity of the speaker. By adjusting the size of the variable gap, the volume of the rear resonant cavity can be changed, thereby adjusting the low-frequency resonance effect of the speaker.

2. The user-adjustable bass monitoring headphones as described in claim 1, characterized in that, The sound guide tube is a gradually expanding arc-shaped extension groove, the width of which gradually increases from one end to the other. Its entire length is defined by an arc with a constant radius of curvature. The sidewalls expand asymmetrically from one end to the other, so that the groove width increases monotonically along the arc length direction, and the expansion amplitude changes continuously and smoothly in any cross section. The whole is integrally formed. The first sound guide hole is located at the narrowest end of the arc-shaped extension groove.

3. The user-adjustable bass monitoring headphones as described in claim 1, characterized in that, A rotating nut is provided in the middle of the rear side of the acoustic rear cavity, and a rotating screw is fixed in the middle of the bass adjuster. One end of the rotating screw extends from the front side of the bass adjuster and cooperates with the rotating nut. By turning the rotating screw, the bass adjuster is rotated, thereby realizing the position adjustment of the second sound guide hole relative to the first sound guide hole.

4. The user-adjustable bass monitoring headphones as described in claim 1, characterized in that, The minimum variable gap position between the first sound guide hole and the second sound guide hole is when they are coaxially aligned, and the maximum variable gap position is when the second sound guide hole is located at the farthest point from the first sound guide hole on the sound guide tube.

5. The user-adjustable bass monitoring headphones as described in claim 1, characterized in that, The acoustic front cavity is a plate-shaped structure with several through slots for sound propagation in front of the speaker; the rear side of the acoustic front cavity is provided with a circular step structure to support the speaker and form a front chamber between the speaker and the acoustic front cavity.

6. The user-adjustable bass monitoring headphones as described in claim 1, characterized in that, The bass adjuster has a rear cover on its rear side. The rear cover is connected to the acoustic front cavity through a bracket to form an enclosed structure. The bass adjuster, the acoustic rear cavity, and the speaker are arranged sequentially in the enclosed structure.

7. The user-adjustable bass monitoring headphones as described in claim 6, characterized in that, The back cover has an opening at the position corresponding to the rotating screw, which allows the user to turn the rotating screw to adjust the bass.

8. The user-adjustable bass monitoring headphones as described in claim 6, characterized in that, The bass adjuster has a limiting groove on its rear side and a limiting block on its front side. The limiting groove is an arc-shaped groove with the same length and curvature as the arc extension groove of the sound tube. The limiting block is engaged in the limiting groove and slides to limit the rotational stroke of the bass adjuster.

9. The user-adjustable bass monitoring headphones as described in claim 1, characterized in that, The rear side of the bass regulator has a sloping surface, which forms a clearance structure with the sound guide tube. Several through slots are evenly distributed on the sloping surface to eliminate standing wave conditions in the headphones and reduce structural weight.

10. The user-adjustable bass monitoring headphones as described in claim 1, characterized in that, The acoustic rear cavity is provided with several countersunk holes. The fixing screws pass through the countersunk holes and cooperate with the screw posts on the acoustic front cavity to achieve a fixed connection between the acoustic rear cavity and the acoustic front cavity.

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