Anechoic chamber

I'm thinking of building a small Anechoic chamber 2mtrs x 2mtrs for testing small transducers. Has anyone seen plans ,or have any info? Andy.

I asked this question some time ago. Do a search. BTW, I'm still interested in building an anechoic room. So let's continue the discussion. /Anders

It´s not possible to build a "true" anechoic chamber with those dimensions. (I sure wouldn´t know how that would work physically, i may be corrected??) Since you need absorption on all frequencys. And absorbing low frequencys would certanly be a problem with 2x2m.

True, As far as I know the thickness of the walls should be at least a 1/4 of the wavelength you want to absorb. This means that the walls should be at least 4 meters thick. I also think that there is some rule for the minimum inner dimensions of the room. Is there any way around this? I've read somewhere about something called Kundt tube or something. What is that? Can anyone explain? Thank you, /Anders

There was an anechoic chamber at the university i attended. It was only about a 10 ft cube. I'm not sure of exact dimensions. The interior was fully resilent...all the walls, ceiling, and floor were, i think trampoline material attached w/ springs. I don't remember what all absorbtion they had had behind. I do not know exactly how absorbant the chamber was, but it is by far the most dead space if ever been in.