The following article is about how more sound recording libraries being made of everyday sounds. This article talks about sounds of streams, rivers, and lakes. The recorders use a dual microphone system and have been recording for 5 years.
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Another Sound Effects Library Round-Up. Cool sounds.
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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?