Check out this article on prosoundweb.com by Bruce A. Miller which is aimed at the audio recording engineers audience. In particular he discusses microphone placement decisions made when arranging a physical setup for a band. The advice given is to arrange the microphone placement by using your ears instead of your eyes a rule I’ve always lived by.
A good read for anyone starting out in the game:
In The Studio: Mic With Your Ears, Not Your Eyes
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I’m seeking info for sanctuary reverberation absorbsion material ( panels) and best placement.
There may be apps that do that. You can definitely find spectrum analyzers that will measure ultra low.
Is there an APP that can measure the ultra low frequency levels?