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Large anechoic chamber

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About the Large anechoic chamber

An anechoic chamber is a silent room used for carrying out standard acoustical tests. ‘An-echo-ic’ means without echoes. As the chamber sounds very ‘dead’, measurements are not influenced by the room surfaces.

Our anechoic room is one of the largest in the UK. The room is lined with sound absorbing polyurethane foam wedges. This creates 'free field' conditions with no sound reflection from the walls, floor or ceiling. 

Uses include measuring:

  • the sound power of a machine to British, European and international standards
  • microphone and loudspeaker frequency responses 
  • sound levels and spectra of alarm sounders such as smoke alarms, train horns and fog horns  

We've recently installed new polyurethane wedges along with a wire-mesh or ‘trampoline’ floor, and removable load-bearing floor panels.  

Part of: ISVR Consulting

Technical specification


  • built as a single-skin concrete box
  • acoustically isolated from the rest of the building by an air gap
  • 305mm thick reinforced concrete walls to insulate against external noise 

 Wall lining  

  • approximately 3209 non-flammable open-cell polyurethane wedges
  • extends 1.2 metres from the walls, floor and ceiling
  • free field conditions exist at frequencies above 70Hz  


  • without wedges: 9.15 metres wide, by 9.15 metres long, by 7.32 metres high
  • volume: 611 cubic metres
  • usable space between the wedge tips: 6.70 metres wide, by 6.70 metres long
  • height from the load bearing floor to the ceiling wedge tips: 4.86 metres
  • usable volume: 218 cubic metres 


  • main access through a pedestrian door: 1.29 metres wide, by 2.10 metres high
  • alternative access for larger items through double doors: 2.0 metres wide, by 2.4 metres high   


A permanent wire-mesh floor can be walked on and will support a distributed load of 8 people.  

We can also install a load-bearing floor. It is made of removable glass-reinforced plastic grid panels above the wire-mesh floor.

The panels, supported on removable posts, are 600mm square. We can install as many panels as needed to support equipment under test or microphone stands. The floor can take a spread load of several tons.

A varnished chipboard flooring can be overlaid onto the load-bearing floor. This is useful when test standards need a ‘free field above a reflecting plane’ (hemi-anechoic conditions).

Control room  

There is a control room next to the chamber which allows laptops, instrumentation and equipment to be placed outside the chamber. Cable ports give access to and from the chamber.

Large anechoic chamber

Contact us

We are part of the University’s Rayleigh Laboratories operated by ISVR Consulting.  Get in touch to find out more about our facility and how we might be able to work with you.
ISVR Consulting, Building 15, University of Southampton, University Road, Southampton, SO17 1BJ 
We’re open Monday to Friday 09:00 to 17:00 UK time.

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