Full - Anechoic Room
- Size room : 4 x 4 x 3 m
- Cut off Frequency : 125 Hz
- Background Noise : 11 - 14 dBA
Anechoic Room
A room lined with sound-absorbing wedges to create free-field conditions for precision acoustic measurement and product testing. Available as full anechoic or semi-anechoic with a reflective floor.
An anechoic room is a specially designed acoustic environment that minimizes sound reflections, allowing engineers to measure and analyze the sound emitted by a product with high accuracy. Specialized acoustic foam wedges or absorbers are installed on the walls, ceiling, and, in a fully anechoic room, the floor to absorb sound energy rather than reflect it. The room structure also provides acoustic isolation from external noise, while temperature and humidity control can be incorporated to support stable and repeatable testing conditions.
By minimizing sound reflections and controlling background noise, an anechoic room creates an environment that approximates free-field conditions, enabling engineers to characterize product noise, identify sound sources, and evaluate acoustic performance under controlled conditions.
Key features
- Full anechoic and hemi-anechoic designs
- Cut-off frequency options: 100, 125 or 250 Hz
- Target background noise of 20 dBA or lower
- Supports ISO 3745 and ISO 3744 sound power measurement
- Optional temperature and humidity control
- Free-field qualification measurement
Built for precise acoustic measurement
Every room is designed around your product and your test standard.
100 HzCut-off frequency from 100 Hz (125 or 250 Hz options)
≤ 20 dBATarget background noise
ISO 3745and ISO 3744 sound power measurement
2 designsFull anechoic or hemi-anechoic
Why test in an anechoic room?
Outdoor and conventional indoor testing environments can be affected by wind, weather, background noise, and sound reflections from surrounding surfaces. A properly designed and qualified acoustic test room helps reduce these influences, improving measurement consistency and supporting reliable product evaluation.
Designed to your specification
SP Sonic designs and supplies anechoic and hemi-anechoic rooms to meet different testing requirements, with design options for cut-off frequencies of 100 Hz, 125 Hz, or 250 Hz and target background noise levels of 20 dBA or lower, subject to project specifications and verification.
Measurement to international standards
Our solutions can be designed to support sound power level measurements in accordance with ISO 3745, which specifies precision methods for anechoic and hemi-anechoic rooms, and ISO 3744, which specifies engineering methods for sound power measurements in an essentially free field over a reflecting plane. The applicable standard depends on the test room configuration, qualification results, measurement procedure, and intended application.
Where anechoic rooms are used
From automotive, aerospace, and electronics to home appliances, telecommunications, industrial equipment, and university research laboratories, anechoic and hemi-anechoic rooms help engineers evaluate acoustic performance, identify noise sources, investigate noise-related issues, and develop quieter, more efficient products.
Tailored to your product
With solutions tailored to your product dimensions, frequency range, background noise requirements, and applicable testing standards, SP Sonic helps create reliable acoustic testing environments that support product development, quality assurance, and research.
Specifications
| ROOM TYPES | |
|---|---|
| Full anechoic | absorbers on walls, ceiling and floor |
| Hemi-anechoic (semi-anechoic) | reflective floor for heavy products |
| DESIGN OPTIONS | |
| Cut-off frequency | 100 Hz, 125 Hz or 250 Hz |
| Background noise | 20 dBA or lower (target, subject to specification and verification) |
| Climate | temperature and humidity control (optional) |
| Room size | designed around product dimensions and frequency range |
| STANDARDS | |
| ISO 3745 | precision sound power, anechoic and hemi-anechoic rooms |
| ISO 3744 | engineering sound power, free field over a reflecting plane |
| QUALIFICATION | |
| Qualification | free-field measurement after installation |
Example Project
Semi - Anechoic Room
- Size room : 10 x 8 x 6 m
- Cut off Frequency : 125 Hz
- Background Noise : 12 dBA
Semi - Anechoic Room
- Size room : 6 x 6 x 4 m
- Cut off Frequency : 250 Hz
- Background Noise : 14 dBA
Full - Anechoic Room
- Size room : 5.7 x 5.7 x 3.65 m
- Cut off Frequency : 125 Hz
- Background Noise : 16 - 18 dBA
Related acoustic rooms and products
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