This article is from the Car Audio FAQ, by Ian D. Bjorhovde (ianbjor@mobileaudio.com) with numerous contributions by others.
"Anechoic" means not echoing. It usually refers to a style of
measuring a speaker's output which attempts to eliminate echoes (or
"reflections") of the speaker's output back to the measurement area,
which could alter the measurement (positively or negatively).
 
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