Introduction

Extremely Low Frequency Wall Bass Trap:， Acoustic Tool for Precise Control of Low Frequency Sound Waves

In acoustic design, the handling of low-frequency sound waves has always been a key challenge. Extremely low-frequency sound waves (e.g. 30-200Hz) are so powerful that they are prone to form standing waves in the room, resulting in muddy and distorted sound, which seriously affects the listening experience. Now, a specially designed for very low frequency wall bass trap came into being, its size is 600mm × 600mm × 260mm, can effectively absorb 30-200Hz very low frequency sound waves, the surface of the sound-absorbing cloth material, both practicality and aesthetics, for the optimisation of the acoustic environment provides a new solution.

I. Challenge of very low frequency sound wave
Extremely low-frequency sound waves (30-200Hz) are the ‘bass’ part of the sound, commonly found in large musical instruments (such as bass, drums) and high-power audio systems. Due to their extremely long wavelengths and large amounts of energy, very low-frequency sound waves tend to form standing waves in corners, walls and ceilings as they travel through a room. Standing waves cause some frequencies to be over-amplified while others are weakened, creating a clear ‘sound colouring’ and a loss of balance and clarity. For example, in an untreated room, low-frequency sound may produce a strong boom in some areas, while in other areas is almost inaudible, a phenomenon that seriously affects the playback of music, film sound experience and the accuracy of recordings.

Characteristics of the Extremely Low Frequency Wall Bass Trap
The Very Low Frequency Wall Bass Trap measures 600mm x 600mm x 260mm and is designed to absorb very low frequency sound waves from 30-200Hz. Its internal structure has been carefully optimised with high-density sound-absorbing materials to effectively capture and absorb the energy of very low frequency sound waves. Compared with ordinary bass traps, its performance in the very low frequency band is much better, which can significantly reduce the generation of very low frequency standing waves in the room and improve the clarity and balance of the sound.

(i) Absorption frequency range
30-200Hz is the core frequency range of very low frequency sound waves; the ultra-low frequency sound around 30Hz usually comes from the lowest register of a large subwoofer or a large musical instrument, while the low frequency sound around 200Hz contains the bass resonance of some musical instruments and the low frequency part of the human voice. This bass trap can effectively absorb sound waves in this frequency range, reduce the reflection and standing wave phenomenon of very low frequency sound waves in the room, and make the sound more pure and natural.

(ii) Sound-absorbing cloth surface
The surface of the bass trap is made of sound-absorbing cloth, which is not only an aesthetic design choice, but also has important acoustic significance. The sound-absorbing cloth has good sound absorption properties, which can further absorb high-frequency sound waves and reduce the reflection of sound on the surface. When sound waves come into contact with the bass trap, the sound-absorbing fabric first absorbs the high-frequency component, and then the remaining very low-frequency sound waves are absorbed by the internal sound-absorbing material. This dual absorption mechanism makes the bass trap more comprehensive and efficient in processing sound. In addition, the surface of the sound-absorbing cloth can be selected in different colours and textures according to the overall style of the room, so that the bass trap blends in with the room environment, which is both practical and aesthetically pleasing.

Application Scenarios
(I) Professional recording studio
In the recording studio, the treatment of very low frequency sound waves is crucial. This Bass Trap can effectively absorb very low frequency sound waves and reduce the generation of standing waves, so that the recording engineer can more clearly capture the real timbre of instruments and vocals, and avoid the sound quality distortion caused by room acoustic problems. For example, when recording a large symphony, the very low frequency sounds of the bass and drums can be processed accurately, making the recording more realistic and natural.

(ii) Home theatre
For home theatre enthusiasts, a good acoustic environment can greatly enhance the viewing experience. Extremely low-frequency bass traps can absorb extremely low-frequency sound waves in the room, reducing reverberation and resonance of the sound, making the sound effect of the film more realistic and shocking. For example, when watching an action film, the very low frequency portion of explosions and gunshots can be more clearly conveyed to the audience without becoming muffled or distorted due to acoustic problems in the room.

(iii) Professional audio-visual rooms
In professional audio-visual rooms, such as music studios, film and television post-production studios, etc., the very low frequency bass trap is an essential piece of equipment. It can provide a stable and accurate acoustic environment for professionals, enabling them to carry out audio production and editing with greater precision. For example, during music production, the Extreme Low Frequency Bass Trap can help producers better judge the low frequency balance of the music and avoid misjudgments caused by room acoustic problems.