The following article on audio-issues.com is worth a read. The author examines the effects and possible downside to recording audio with reverb. The case is made that once the reverb is recorded on the track it is permanent and cannot be removed. The article offers additional and alternative steps one can take to obtain the desired sound on their recording.
Worth your attention:
Is Recording With Reverb Really Harmful to Your Audio?
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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?