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Anechoic means “no echoes” and, if you have never seen an anechoic chamber, this is one of the best. It’s at the Building Research Establishment, just north of London, UK and is the largest in Europe. It’s size is indicated by the Bowers & Wilkins engineer in the photo and the speaker is an early Model 801, which puts the date somewhere in the 1970s. We used to hire the chamber in those days to make really accurate bass response measurements. The open air might have been an alternative, but there you have to cope with noise from wind and passing traffic and worry whether the sun is shining or there’s snow on the ground.
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