| Room gain AKA cabin gain [message #25001] |
Wed, 10 March 2004 11:12  |
Morpheus
Messages: 1
Registered: May 2009
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Esquire |
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Does any of you know a mathematical derivation for bass room gain, AKA cabin gain? I've read elsewhere that it is 12db/oct as frequency drops and this coming by respected (by some) people in the biz. That's why I ask here to get a fresh perspective. I have a hard time with the idea of a fixed 12db/oct figure. I think it should be 3db gain when the frequency makes the nearest surface act like half space, then 6db when the next surface comes into play and then 9db when the next does. That gets us to 8th space, below that ther must be some additional gain but I can't see it going at a logarithmically increasing rate as frequency drops. That would seem to imply a logarithmic change in space to wavelength, but how can this be when every change (decrease in frequency, space) is linear? Do any of you know a reliable mathematical derivation of cabin gain? Is it really 12db/oct or is it stepped as room surfaces come into play? At very low frequencies what is it mathematically?
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