This short video provides an introduction to some interesting facts about sound like how it is actually a change in air density, and that it travels at 761 miles per hour. The video contains some very entertaining and education visual images of interest to any one who like science in general.
Read the full article here:
What Does Sound Look Like? – YouTube
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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?