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Fully Anechoic Chamber for Loudspeaker Testing and R&D

  • IAC designed and installed a fully anechoic acoustic chamber for a commercial test facility, supporting the development, acoustic evaluation, and validation of large loudspeaker systems under true free-field measurement conditions.

Project Summary

RELATED SOLUTION

Location

  • Germany

Client

  • 🔒

Project Year

  • 2009
Audi fully anechoic chamber for automotive loudspeaker design and acoustic testing
  • <10 dBA
  • ISO 3745 Class 1
  • 100 Hz–10 kHz
  • STC 60
  • Background Noise
  • Free-field Conditions
  • MEASUREMENT RANGE
  • MODULAR SYSTEM

Project Challenge

Fully anechoic chamber: True free-field conditions for loudspeaker testing

  • The customer required a highly controlled acoustic environment for the development and evaluation of automotive loudspeaker systems. The chamber needed to achieve background noise levels below 10 dBA and provide true free-field conditions in accordance with ISO 3745 Class 1, with valid free-field performance down to 100 Hz. At the same time, the facility had to accommodate heavy loudspeaker test articles and measurement equipment.

Engineered solution

How we solved it

To achieve the required acoustic performance, IAC designed and installed a fully anechoic acoustic chamber using the proven Microdyne® STC 60 room-within-a-room construction system.

High-performance anechoic absorber wedges were installed across all interior surfaces, including the floor area beneath a non-reflective grating floor system. This configuration creates true free-field conditions throughout the measurement volume, with valid performance down to 100 Hz and a measurement range extending to 10 kHz.

The grating floor provides safe access for personnel while allowing the chamber to accommodate heavy loudspeaker test articles and measurement equipment. Together with the high-performance isolation system, the design delivers the exceptionally low background noise levels required for precise acoustic measurement.

Project Results

What the project delivered

The completed fully anechoic chamber provides a controlled acoustic environment for loudspeaker development, benchmarking and validation.

The chamber enables precise measurement of sound power, frequency response, directivity and other critical acoustic parameters, while maintaining the low background noise and free-field conditions required for automotive audio system development.