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Anechoic Chamber Construction Service

 

Introduction of Anechoic Chamber Build-Up Service

An anechoic chamber is a specially designed space that can effectively absorb sound reflections and isolate external noise interference, and is commonly used for acoustic testing, product certification, scientific research experiments and other applications.

 

We are a trusted industry leader, ready to help you set up your lab with ease.

 

Key Design Features

Acoustic Wedge Design

    • Material: Glass Fiber / PU Foam / Mineral Wool

    • Frequency range: 80 Hz ~ 20 kHz

    • Arrangement: Six-side (including floor and ceiling) wedge structure to avoid sound reflection.

Floating floor / Suspended structure

    • Use of resilient acoustic materials such as spring hangers and rubber damping pads

    • Effective isolation of structural sound transmission

Shielding structure and door design

    • Multi-layer wall soundproofing (mortar, steel plate, acoustic foam)

    • High acoustic performance acoustic door (Rw ≥ 40 dB)

Background noise control

    • HVAC silent air conditioning system

    • Background noise in accordance with ISO 3745 (typically ≤ 15 dBA)

Lighting and Safety
    • Non-acoustic LED lighting

Example pictures of an acoustic chamber

Picture 1: Interior structure of an acoustic chamber with sound-absorbing wedges on the walls.

Figure 2: Floating floor construction section

Picture 3: Door and conduit alignment design of the acoustic chamber during installation.

Picture 4: The complete setup of the test equipment installation environment (including microphone and audio source).

Anechoic

 

Acoustic measurements need to be made in an Anechoic Chamber, primarily to ensure accuracy and consistency. Here are some of the main reasons:

Elimination of reflected sound and interference

The walls, ceiling and floor of the Anechoic Chamber are covered with a wedge-shaped sound-absorbing material that absorbs sound waves coming from all directions, simulating a "free-field" environment:

  • Measurement of reflected sound interference from walls, ceilings and floors.

  • Reverberation (reverberation) caused by the energy superposition or attenuation errors

This is especially important for measuring the directionality of speakers, microphones, and sound sources.

Obtain realistic and reproducible sound data.

A reverberant chamber provides a highly consistent acoustic environment in which to conduct these measurements:

  • Frequency response

  • Sound pressure level (SPL)

  • Sensitivity

  • Polar pattern

  • THD (Total Harmonic Distortion) test

If these data are measured in a normal space, they will be limited by space echoes and background noise, resulting in distorted test results.

Simulation of sound propagation under ideal conditions

Certain tests are designed to analyze "sound behavior without environmental interference", for example:

  • Energy distribution of a single sound source

  • Highly accurate noise source localization

  • Intrinsic noise of equipment (e.g. fan noise, motor noise)

Noise-free chambers can be used to remove environmental variables, making research or certification more scientific.

Control of background noise

Soundproofed chambers are typically designed to have a background noise level of less than 15 dBA, or even as low as 5 dBA, meeting the following standard requirements:

  • ISO 3744 (sound power testing)

  • IEC 60268 (testing of acoustic installations)

  • ANSI S12.55 (product sound output standard)

This is especially critical for testing of **low noise devices (e.g. laptops, silent appliances)**. If you have a need for a silent room, please contact us!