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In Reply to: RE: Dynamics Measured.... posted by BigguyinATL on April 21, 2017 at 06:32:35
"You sort of have this backwards."
Not really. His point is simply that the sound of scissors cutting paper, at some "normal" distance, say from your hands to your ears, is a very small sound, and that, as you move the microphone (or your ears) closer, it's louder. At a normal distance, it ain't anywhere near 140 dB peak.
If you want to reproduce that sound, and hear it from 8 feet away AS IF you were 2 inches away, that's a different ballgame.
BTW, regarding studio rooms... When I was in Studio D at Fantasy in Beserkeley, it was like being in heaven! Quiet, spacious, nice visual asthetics, and Alison was easy on the eyes, too. Forget recording - I could hang out in that room just to unwind or have lunch!
Anyway, regarding sound levels... Did you know that the SPL of a trumpet can be up to 200 dB at the bell of the horn?! Holy crap! Somebody told me this years and years ago. Ever since, I've wondered if most trumpet players know this, 'cause especially these days, lots of them use "clip-on" microphones on their horns. I remember recording the Buddy Rich band, and the trumpet soloist was practically eating the microphone, and it sounded like a f-ing kazoo. On the other hand, Doc Severinsen uses a Sennheiser 441, and, doesn't eat it.
Edits: 04/21/17Follow Ups:
I heard 150db at the bell not 200db. What was your source for that number?
I don't recall the figure but it is quite high.
This high speed video captures what they called a shock wave produced by a trumpet however a traditional shock wave is visible on the rarefied side.
The second video is a system i developed the transducers and control electronics for which here is operating in the mid 160dB's at about 21Khz and at least up to 175dB, i never saw any kind of shock wave even at those pressures (although at 175dB one could light a cigarette with acoustic friction).
I don't remember, it was a long time ago. Anyway, I play the trumpet, and it can be VERY loud at the bell. Heck, it can be very loud 15 feet away. I went to a clinic/master class given by Doc Severinsen about 3-4 years ago. He picked up a student's horn, pointed it right at me, and darn near parted my hair with a scale going up to high C.
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