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Sound absorption in air.
"Chel van Gennip" I used the sensorsmag data to create a table of sound absorption for the audible range: http://www.serg.vangennip.com/absorption.pdf ** Shame your figures do not include data for 15kHz. That is the highest frequency that is significant for most adults when music listening - ie filtering out all above 15kHz has no audible effect. It is indeed more than you expect. For a living room situation I see about 3 db for 20 kHz at 4m. ** See: http://www.csgnetwork.com/atmossndabsorbcalc.html For a room temp of 26C and 75% humidity, the absorption loss at 20kHz over 4 metres is only 1.3 dB. For 15 kHz it is only 0.8 dB. For a concert hall situation I see 20dB loss for 20kHz at 28m. ** More like 11.5 dB at 20kHz. Or 6.9 dB at 15 kHz. I am afraid there are no fast transients or extremely high frequencies for sound in a real life concert hall. ** Sure - it sounds dull in any concert hall but that has SFA to do with absorption. It HAS all to do with *reverberation* being the major component of sound heard in the body of the audience. BTW: Most recording are made with close mic techniques, to overcome reverberation. The mic is in a spot no audience member ever could be. It is *possible* for some supersonic stuff to get picked up and be recorded on wide bandwidth gear. But only the dogs and bats in your house will hear it. ......... Phil |
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