mtgox
01.06.2021 22:14:09
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See full version: The Concept of Sound Pressure (SPL)
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It explains how frequency (pitch) of a sound relates to volume (the Sound Pressure level measured in dB) and loudness (subjective/something we perceive).
I'm all for not blowing out people's ears, but if you mixed any rock concert at 80 db you'd be fired on the spot. [links]
For the second part of your question about pressure level. (I looked this up, but I'm glad I did because now I know! =] ) The reason it doesn't seem like "pressure" at all is because it's so much smaller than anything you compare it to for feeling pressure (like pressure on your ears diving underwater, for example). To explain: volume is objectively measured in dB, which is a logarithmic scale based on how much more volume (SPL) a sound has relative to the quietest limit of human hearing. But the basic physical unit for measuring SPL itself is actually: the Pascal. According to the Internet, 1 Pascal = 0.000145038 PSI(pounds per square inch). So yes. it is pressure, the exact same physical phenomenon of having an additional atmosphere's worth of pressure on you (14.6959 pounds per square inch) when you dive 10 meters down underwater - it's just with sound, the differences in pressure are so small we don't actually feel them as pressure, we just hear and perceive those differences as "louder" or "quieter" with the precise sensitivity of our ears.
"try to keep the SPL at or below 80 db" [links]
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