I was a small part of this process when Memphis, TN built the Cannon Center, which is a hall built for symphony and other concerts and has outstanding acoustics. The room was designed with acoustics in mind, but I was part of an ensemble that rehearsed in there for a few hours while technicians put up various sound absorbing / reflecting panels and moved them into the right positions. As for the specifics, I’m not sure, but I can tell you that hall is great for both the audience and the performers.
I also know that fine acoustic spaces avoid flat walls parallel to each other (or put baffles on said walls to stop echoes) because sound in that kind of environment will bounce back and forth, creating a very audible fast echo.
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