Dual frequency bass boost cavity for a stringless guitar

Abstract

This utility model relates to a dual-crossover bass enhancement acoustic cavity for stringless guitars, belonging to the technical field of stringless guitars. It includes a closed acoustic cavity formed by injection-molded upper and lower covers; a mid-low frequency speaker and a high frequency speaker arranged side-by-side inside the cavity; and a sound-transmitting opening in the upper cover, on which a passive radiator is installed. The passive radiator includes a metal counterweight and a damping rubber ring, sharing the cavity's air volume with the mid-low frequency speaker, generating low-frequency resonance through air pressure coupling. Multiple buffer rubber pads are provided on the edge of the upper cover to reduce vibration during guitar assembly. The passive radiator is fixed to the sound-transmitting opening by adhesive, and its vibration plane is parallel to the diaphragm plane of the mid-low frequency speaker. The upper and lower covers are connected by screws, forming a modular assembly. This utility model, through its dual-crossover design and passive radiator structure, effectively enhances low-frequency response and mid-high frequency performance, improving the sound quality of the stringless guitar.

Description

Technical Field

[0001] This utility model relates to the field of stringless guitar technology, specifically to a dual-frequency bass enhancement chamber for stringless guitars. Background Technology

[0002] With the development of electronic musical instruments, stringless guitars, as a portable electronic instrument, have gradually gained popularity among music lovers. The sound quality of a stringless guitar largely depends on its sound chamber design, especially its low-frequency response, which directly affects the playing effect. Currently, the sound chamber design of stringless guitars on the market mainly uses a bass reflex port structure to enhance the low-frequency effect.

[0003] In existing technologies, bass-enhancing speaker enclosures typically employ passive radiator structures to improve low-frequency response. For example, Chinese patent CN202135298U discloses a bass-enhancing speaker enclosure comprising a cabinet, a passive radiator mounted on the cabinet, and at least one speaker driver. A acoustic cavity is formed between the passive radiator and the speaker driver and the cabinet, and this cavity is filled with damping material. This design uses damping material to ensure that the speaker driver and the passive radiator radiate outwards in phase, thereby improving electroacoustic conversion efficiency.

[0004] Traditional stringless guitar amplifiers use a bass reflex port to enhance bass, requiring a hole in the guitar body for connection. This not only affects the guitar's appearance but also involves numerous components and cumbersome installation. The bass reflex port design carries the risk of standing wave resonance, which can easily lead to frequency response distortion, abrupt phase changes, and second harmonic noise, resulting in significant sound energy loss. Furthermore, the bass reflex port is prone to wind noise at high power outputs, affecting acoustic performance. Finally, the bass reflex port design offers lower output power and higher energy consumption for the same volume.

[0005] Therefore, there is an urgent need for a new type of stringless guitar sound chamber structure that can achieve better low-frequency response within a limited space, while avoiding the various defects of the bass reflex port solution and improving the overall sound quality of the stringless guitar. Utility Model Content

[0006] The purpose of this invention is to provide a dual-way bass enhancement chamber for stringless guitars, addressing the shortcomings of using a bass reflex port to enhance bass in stringless guitar amplifiers. These shortcomings include the need for openings in the guitar body for connection, affecting the guitar's appearance; numerous components making installation cumbersome; the risk of standing wave resonance in the reflex port, leading to frequency response distortion, abrupt changes in sound phase, second harmonic noise, and significant sound energy loss; the tendency to generate wind noise at high power, affecting acoustic performance; lower output power and higher energy consumption for the same volume; and lower equivalent mass of the mechanical system, requiring a larger volume to achieve the same loudness.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a dual-frequency bass enhancement chamber for a stringless guitar, comprising: A closed acoustic cavity consisting of an upper cover and a lower cover. A low-frequency speaker and a high-frequency speaker are arranged side by side inside the cavity; A sound-transmitting opening is provided on the upper cover of the acoustic cavity. A passive radiating cone is installed in the sound-transmitting opening. The passive radiating cone includes a metal counterweight and a damping rubber folding ring. The passive radiating basin shares the cavity air volume with the mid-low frequency loudspeaker, and generates low-frequency resonance through air pressure coupling.

[0008] In one feasible implementation, the metal counterweight of the passive radiant basin is made of at least one of galvanized steel, stainless steel, or tungsten alloy.

[0009] In one feasible implementation, the damping rubber fold is made of butyl rubber, TPE, or a composite material of butyl rubber and polyester fabric reinforcement.

[0010] In one feasible implementation, the edge of the sound cavity cover is provided with at least 6 sound cavity buffer rubber pads to reduce vibration during instrument assembly.

[0011] In one feasible implementation, the passive radiating cone is fixed to the sound-transmitting port by adhesive, and its vibration plane is parallel to the plane of the mid-low frequency speaker diaphragm.

[0012] In one feasible implementation, the upper and lower covers of the acoustic cavity are connected by screws to form a modular assembly.

[0013] In one feasible implementation, the sound-transmitting opening and the passive radiating basin are disposed on the side of the outer wall of the instrument body away from the human body.

[0014] Compared with existing technologies, the beneficial effects of this utility model are as follows: This stringless guitar uses a dual-crossover bass enhancement chamber, which has a simple structure, fewer components, and is easy to manufacture and assemble; it achieves crossover purity, with high-frequency and mid-low-frequency units emitting sound independently, eliminating intermodulation distortion of the full-range unit; it extends low frequencies through passive radiator resonance, achieving physical bass enhancement; the passive radiator achieves low-frequency extension through mass tuning rather than pipe length, saving more than 25% of space in a limited volume; since there is no airflow, wind noise is eliminated, ensuring tonal purity during high-gain performance and avoiding turbulent distortion at high sound pressure levels in traditional bass reflex tubes; the diaphragm radiates in the same direction as the speaker, improving low-frequency directivity; the diaphragm operates in the large displacement linear region, reducing nonlinear distortion at high amplitudes compared to bass reflex tubes, achieving nonlinear distortion suppression; a single cavity accommodates three sound units, reducing assembly complexity and production costs, and eliminating the need for openings in the guitar body, making installation more convenient; smaller size and fewer components improve product reliability while reducing costs. Attached Figure Description

[0015] Figure 1This is a schematic diagram of the combined state of this utility model; Figure 2 This is a schematic diagram of the structure of this utility model in an explosion state; Figure 3 This is a schematic diagram of the passive radiant basin in this utility model.

[0016] In the diagram: 10, upper cover of the acoustic cavity; 20, lower cover of the acoustic cavity; 30, sound-transmitting opening; 40, passive radiator; 50, high-frequency loudspeaker; 60, mid-low frequency loudspeaker; 70, acoustic cavity buffer rubber pad; 80, bracket; 41, metal counterweight; 42, damping rubber folding ring. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figures 1 to 3 This utility model provides a dual-frequency bass enhancement cavity for a stringless guitar. The dual-frequency bass enhancement cavity for a stringless guitar includes an upper cavity cover 10 and a lower cavity cover 20. The upper cavity cover 10 and the lower cavity cover 20 are manufactured by injection molding and connected by screws to form a closed acoustic cavity, constituting a modular component.

[0019] Inside the enclosed acoustic cavity, a mid-low frequency speaker 60 and a high frequency speaker 50 are arranged side by side. This dual-speaker design allows the acoustic cavity to process sound signals in different frequency bands separately, achieving more accurate sound reproduction. The mid-low frequency speaker 60 is primarily responsible for processing mid-low frequency sound signals, while the high frequency speaker 50 is responsible for processing high frequency sound signals. Both can be fixed using a bracket 80. The high frequency speaker 50 employs an independent sealed sub-cavity to avoid airflow interference.

[0020] A sound-permeable opening 30 is provided on the upper cover 10 of the acoustic cavity, and a passive radiating cone 40 is installed in this opening 30. The passive radiating cone 40 comprises two main parts: a metal counterweight 41 and a damping rubber folding ring 42. The metal counterweight 41 can be made of at least one of galvanized steel, stainless steel, or tungsten alloy. Galvanized steel, stainless steel, or tungsten alloy materials have good mass density and rigidity, which can ensure that the passive radiating cone 40 has appropriate mass and stability during operation. The damping rubber folding ring 42 can be made of butyl rubber, TPE, or a composite material of butyl rubber and polyester fabric reinforcement. Butyl rubber, TPE, or butyl rubber and fabric reinforcement materials have good elasticity and damping characteristics, which can ensure that the passive radiating cone 40 has appropriate damping and restoring force during vibration.

[0021] The passive radiator 40 is glued to the sound-transmitting port 30, and its vibration plane is parallel to the diaphragm plane of the mid-low frequency speaker 60. This parallel arrangement allows the passive radiator 40 to more effectively couple with the mid-low frequency speaker 60 via air pressure. The passive radiator 40 and the mid-low frequency speaker 60 share the cavity air volume. When the mid-low frequency speaker 60 is working, the air pressure change in the cavity drives the passive radiator 40 to vibrate, generating low-frequency resonance through air pressure coupling. This significantly enhances the low-frequency response, allowing the stringless guitar to produce a fuller low-frequency effect during playing, thus improving the overall sound quality.

[0022] The edge of the acoustic cavity cover 10 is provided with at least 6 acoustic cavity buffer rubber pads 70, or it can be set to 8 (e.g. Figure 1 As shown, eight sound chamber damping rubber pads 70 are distributed at various positions along the edge of the top cover to reduce vibrations during guitar assembly. When the stringless guitar vibrates during playing, the eight sound chamber damping rubber pads 70 can effectively absorb and buffer vibration energy, preventing vibrations from being transmitted to other parts of the guitar body, thereby reducing unnecessary resonance and noise and improving the purity of the sound quality.

[0023] The sound-transmitting port 30 and the passive radiator 40 are oriented in the outer wall of the instrument body away from the contact surface with the human body. The vibration plane of the passive radiator 40 does not contact the user's body, and the vibration trajectory of the metal counterweight 41 is restricted to the external space of the instrument body, avoiding the risk of mechanical impact with the human body. At the same time, the vibration surface of the passive radiator 40 is arranged in the same direction and parallel to the diaphragm of the mid-low frequency speaker 60 and the high frequency speaker 50, so that the resonant sound wave and the mid-high frequency sound wave are superimposed on the spatial propagation path, avoiding the phase cancellation of low frequency sound waves caused by the rear reflection surface of the instrument body.

[0024] The proposed design for a dual-way bass enhancement chamber for stringless guitars effectively addresses the issue of insufficient low frequencies in traditional stringless guitars by combining dual-speaker crossover technology with passive radiator 40 low-frequency enhancement technology. At the same time, it ensures clarity in the mid and high frequencies, resulting in a fuller, more balanced tone that is closer to the natural tone of traditional guitars, thus enhancing the playing experience and auditory effect.

[0025] In the description of this utility model, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "side," "top," "inner," "front," and "both ends," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. At the same time, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "fixed installation," 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 elements or the interaction relationship between two elements. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dual-frequency bass enhancement chamber for a stringless guitar, characterized in that, include: A closed acoustic cavity consisting of an upper cover (10) and a lower cover (20); A low-frequency loudspeaker (60) and a high-frequency loudspeaker (50) are arranged side by side inside the cavity. A sound-transmitting opening (30) is provided on the upper cover (10) of the sound cavity. A passive radiating basin (40) is installed in the sound-transmitting opening (30). The passive radiating basin (40) includes a metal counterweight (41) and a damping rubber folding ring (42). The passive radiating basin (40) and the low-frequency loudspeaker (60) share the cavity air volume and generate low-frequency resonance through air pressure coupling.

2. The dual-frequency bass enhancement chamber for a stringless guitar according to claim 1, characterized in that: The metal counterweight (41) of the passive radiant basin (40) is made of at least one of galvanized steel, stainless steel or tungsten alloy.

3. The dual-frequency bass enhancement chamber for a stringless guitar according to claim 1, characterized in that: The damping rubber fold (42) is made of butyl rubber, TPE, or a composite material of butyl rubber and polyester fabric reinforcement.

4. The dual-frequency bass enhancement chamber for a stringless guitar according to claim 1, characterized in that: The edge of the sound cavity cover (10) is provided with at least 6 sound cavity buffer rubber pads (70) to reduce vibration during instrument assembly.

5. The dual-frequency bass enhancement chamber for a stringless guitar according to claim 1, characterized in that: The passive radiating cone (40) is fixed to the sound-transmitting port (30) by adhesive, and its vibration plane is parallel to the diaphragm plane of the mid-low frequency loudspeaker (60).

6. The dual-frequency bass enhancement chamber for a stringless guitar according to claim 1, characterized in that: The upper cover (10) and lower cover of the acoustic cavity are connected by screws to form a modular assembly.

7. The dual-frequency bass enhancement chamber for a stringless guitar according to claim 1, characterized in that: The sound-transmitting opening (30) and the passive radiant basin (40) are located on the side of the instrument body away from the human body.

Images