Hemi-Anechoic Chambers
​​​ETS-Lindgren's Hemi-Anechoic Chambers​ provide a precise free-field environment used to measure sound sources over a reflecting plane. Typical measurements include product noise testing, sound power, sound source frequency response, and sound source directivity.



​​​​ETS-Lindgren's Hemi-Anechoic Chambers​​ provide a precise free-field environment used to measure sound sources over a reflecting plane. Typical measurements include product noise testing, sound power, sound source frequency response, and sound source directivity. These chambers provide engineered features that achieve outstanding performance results and goals without compromising acoustical concepts and budgets.
Hemi-anechoic chambers are used to perform precision- and engineering-grade testing on a wide variety of devices ranging from handheld units to large vehicles and equipment. 

ETS-Lindgren's hemi-anechoic chambers have a high-performance wall panel system that provides the low-noise environment required to test today's low-noise products. A precision-grade free-field environment is a product of the hemi-anechoic chamber's sound absorption system that consists of melamine wedges installed on a patented clip system that provides fast wedge installation and removal. Unlike other wedge solutions, melamine wedges provide a bright and fiber-free working environment.

Key Product Information

​​Frequency Range

ETS-Lindgren offers a wide range of standard hemi-anechoic chambers to meet client needs. Standard chamber models have low-frequency cut off points of 80 Hz, 100 Hz, and 160 Hz. Custom chamber designs to meet other performance specifications are available.

Free-Field Region

ETS-Lindgren Hemi-Anechoic Chambers have free-field regions with a 1 m to 2 m radius as standard. Custom size free-field regions are available.

Precision-Grade Testing

ETS-Lindgren's standard hemi-anechoic chambers are designed to comply with ISO 3745 and ISO 26101 free-field limits for both broadband and pure tone testing.

Engineering-Grade Testing

The high-quality test environment in an ETS-Lindgren Hemi-Anechoic chamber provides low environmental correction factors (K2) values for ISO 3744 sound power testing.


Specifications Select a tab below for more information

  • Modular Steel Isolated Floor or Concrete Isolated Floor (Depends on Size and Lowest Frequency of Interest)
  • ETS-Lindgren's Patented Wedge Clip System (Wall and Ceiling Only)
  • Ventilation Silencers for HVAC or Fan Applications (Wall, Ceiling, or Internal Mounting)
  • Sealed Pendant Lamps
  • Acoustically Treated Cable Penetrations 2.54 cm and 5.08 cm (1 in and 2 in).
  • Custom Sizes Available
  • Engineered and Designed to Host-Site Ambient Conditions
  • Design Based on Performance Data that Conforms with ISO 3745 and ISO 26101 Free-Field Requirements



Small Device Test Enclosures http://www.ets-lindgren.com/products/chambers/acoustic-chambers/acoustic-test-chambers/5003/500304Small Device Test Enclosures
Anechoic Chamber http://www.ets-lindgren.com/products/chambers/acoustic-chambers/acoustic-test-chambers/5003/500302Anechoic Chamber
Predictable Field Chambers http://www.ets-lindgren.com/products/chambers/acoustic-chambers/acoustic-test-chambers/5003/500305Predictable Field Chambers
Hemi-Anechoic Chambers http://www.ets-lindgren.com/products/chambers/acoustic-chambers/acoustic-test-chambers/5003/500301Hemi-Anechoic Chambers
Reverberation Chamber http://www.ets-lindgren.com/products/chambers/acoustic-chambers/acoustic-test-chambers/5003/500303Reverberation Chamber
Acoustic Doorshttp://www.ets-lindgren.com/products/chambers/5003/500306Acoustic Doors

Key Features

  • 80 Hz to 20 kHz (Standard Models; Custom Models Also Available)
  • 1 m to 2 m Radius Hemispherical Free Field (Custom Sizes Also Available)
  • Precision-Grade Testing
  • Engineering-Grade Testing
  • Noise Emission Testing
  • Sound Power Testing

Literature and Videos



http://www.ets-lindgren.com/products/chambers/acoustic-chambers/acoustic-test-chambers/5003/500301<a href="/sites/etsauthor/ProductBrochures/General%20Brochures/Acoustic%20Full%20Line%20Brochure.pdf"><img alt="" src="/_layouts/15/IMAGES/icpdf.png" />Acoustic Full Line Brochure.pdf</a>




L o a d i n g

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