https://studiob.org/newsandupdates/posts/fred-foster-roy-orbison-and-a-coat-rack
We break a sound wave with absorbers away from the wall. If they were touching the wall they would be of no use as the particle velocity there is zero.
Like breaking sea waves by barriers away from the shore. If they were at the shore it would be too late.
References:
Acoustics for radio and television studios - Gilford - BBC
Master Handbook of Acoustics - Everst
Studio Acoustics - Rettinger
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