Introduction

Absorption Frequency 50/60/70/80/90HZ Helmholtz Resonator
In acoustic design, the processing of low-frequency sound waves has always been a key link. Due to its long wavelength and high energy, low-frequency sound waves are prone to form standing waves in the room, resulting in muddy and distorted sound, which seriously affects the listening experience. As an efficient low-frequency acoustic treatment tool, Helmholtz resonators have become the ideal choice for optimising acoustic environments due to their precise frequency absorption characteristics. In this article, we will introduce a 600mm×600mm×160mm Helmholtz resonator, which absorbs one of 50Hz, 60Hz, 70Hz, 80Hz or 90Hz, and is made of sound-absorbing fabric, which is both practical and aesthetically pleasing.

I. Principle of Helmholtz Resonator
Helmholtz resonator is an acoustic device designed based on the principle of resonance, its core structure is an open cavity. When the sound wave enters the cavity, the air inside the cavity will vibrate like a spring, forming a resonance. By adjusting the volume of the cavity and the size of the opening, the frequency absorbed by the resonator can be precisely controlled. The Helmholtz Resonator is particularly suited to handling low frequency sound waves, as it is able to absorb sound energy efficiently at specific frequencies, reducing low frequency standing waves and resonance phenomena in the room.

Product Characteristics
(i) Size and Construction
The dimensions of the Helmholtz Resonator are 600mm x 600mm x 160mm, which is a medium-thickness design that allows it to be easily mounted on a wall or ceiling without taking up too much space. The internal structure has been carefully designed to ensure optimum resonance at the specified frequencies (50Hz, 60Hz, 70Hz, 80Hz or 90Hz). This design makes it particularly suitable for use in places where low-frequency sound waves need to be handled with precision.

(ii) Absorption Frequency
The Helmholtz Resonator is capable of absorbing one of 50Hz, 60Hz, 70Hz, 80Hz or 90Hz, allowing the user to select the appropriate frequency according to the actual acoustic requirements of the room. For example, in a studio with predominantly low-frequency sound, if there is a significant standing wave problem at 70Hz, a 70Hz absorbing Helmholtz resonator can be selected for the treatment. This precise frequency absorption capability makes the Helmholtz resonator highly flexible and targeted in acoustic optimisation.

(iii) Sound-absorbing cloth surface
The surface of the resonator is made of sound-absorbing fabric, which not only enhances the aesthetics of the product, but also strengthens its acoustic performance. The sound-absorbing fabric further absorbs high-frequency sound waves and reduces the reflection of sound on the surface, creating a double sound-absorbing effect. When sound waves come into contact with the resonator, the sound absorbing fabric first absorbs the high frequency components, and then the remaining low frequency sound waves are absorbed inside the resonator. This design allows the Helmholtz resonator to handle low frequency sound waves as well as high frequency sound waves, enhancing the overall acoustic effect.

III. Application Scenarios
(I) Recording Studio
In the recording studio, Helmholtz resonators can effectively absorb low-frequency sound waves of a specific frequency, reducing the generation of standing waves and enabling the recording engineer to capture the true timbre of instruments and vocals more clearly. For example, a resonator that absorbs 80Hz can handle the low-frequency resonance of an electric bass or drum, avoiding sound distortion due to room acoustic issues and improving recording quality.

(ii) Home Theatre
For home theatre enthusiasts, Helmholtz resonators can significantly improve the viewing experience. By absorbing low-frequency sound waves of a specific frequency, it reduces the reverberation and resonance of the sound, making the sound of the film more realistic and shocking. For example, a resonator that absorbs 60Hz can handle the low-frequency resonance generated by a subwoofer, making the sound of explosions and gunshots clearer and more natural.

(iii) Professional audio-visual room
In professional audio visual rooms, Helmholtz resonators provide a stable and accurate acoustic environment for audio production and editing. It helps professionals to process audio more accurately and avoid misjudgments caused by room acoustic problems. For example, during music production, the resonator absorbing 50Hz can handle low-frequency background noise, making the low-frequency part of the music purer and clearer.

Installation and Layout Recommendations
The installation location of the Helmholtz resonator is critical to its acoustic performance. In general, the resonator should be installed preferentially in the corners of the room and in the middle of the walls, where low frequency sound waves are most likely to produce standing waves. Depending on the specific acoustical problem of the room, multiple resonators can be selected and installed in different locations to achieve the best acoustical results. In addition, they can be used in conjunction with other acoustic treatment equipment (e.g. acoustic panels, diffusion panels) to further optimise the acoustic environment of the room.

V. Summary
The Helmholtz Resonator is ideal for optimising the acoustic environment due to its precise frequency absorption and efficient acoustic performance. With dimensions of 600mm x 600mm x 160mm, the resonator is capable of absorbing one of the frequencies 50Hz, 60Hz, 70Hz, 80Hz or 90Hz, and the surface is made of sound-absorbing fabric, which is both practical and aesthetically pleasing. Whether it's a recording studio, a home theatre or a professional audio-visual room, Helmholtz resonators provide a reliable solution for all kinds of acoustic spaces, helping users to create the ideal listening environment.