Musicians usually use decibels to determine the loudness of sound. Decibels are always ratios between quantities in the form of logarithms. Decibels are the only constant way of measuring sound quality. But even with the knowledge of decibels, the loudness quality has to be based on energy over time. Energy is difficult to measure because of the dissimilarities of meters that are used to measure sound.
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Loudness and metering, just part 1. A must read
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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?