If the results matter (and presumably they do), then the "acoustic space design" part calls for an acoustician. You are unlikely to find a contractor who is also an acoustician.
So I suggest engaging an acoustician, who will work with you and with the contractor to deliver the results you want.
I highly recommend Jeff Hedback of Hedback Designed Acoustics. His recording studio designs have won multiple awards, and he does excellent home audio rooms as well, either from the ground up or as an adaptation of an existing space.
He works remotely, from his home near Indianapolis.
Anecdotally, I agree with this. I have access to a wealth of designers that build professional studios by virtue of being in Nashville and had particularly poor results when contracting one to design a room specifically for playback. I'm sure it's possible but my experience was a disaster.I don't know about him Duke, look at his projects all of them including the few listening rooms seem to be tampon centric, not a good sign IME. It's very difficult to find a good acousticians most of the acoustician designed rooms I visit I end up removing or negating what was done by the so called expert. This is really a very grey area and most of them are clueless. You're right about the average contractor knowing anything about listening room acoustics, not their job to design one.
david
It's very difficult to find a good acousticians most of the acoustician designed rooms visit I end up removing or negating what was done by the so called expert.
Oh wow love there speakers they were great at capital fest last year
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