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In Reply to: Re: I don't know if this is what you are looking for, but.... posted by Drew Eckhardt on March 9, 2007 at 11:35:49:
You're partially right...That was an oversimplification - and the full unsimplified version that takes into consideration room modes, etc is unnecessarily complex in the context of the question posed.
There is an axiom that goes something like this:
"It is better to be approximately right as soon as possible than to be 100% accurate six months too late!"
In the same vein, the slightly more accurate version - still ignoring room modes - would be a four-step calculation:
a) Speaker Sensitivity PLUS
b) 10 x Log10 Watts LESS
c) 20 x Log10 Distance in Metres PLUS
d) Delta in SPL for a Stereo Speaker Pair (doubling) = 3dBSo, for a 90dB speaker pair and 100 wpc at 3m:
90 + 20 - 10 = 100dB for 1 speaker and 103dB for a pair
Versus originally posted formula:
90 + 20 - ((3-1)x5) = 100dB for 1 speaker (and 103dB for a pair)
The answers appear to be the same.... Hmmm....
(please consider your leg firmly pulled... :-)
DevillEars
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Follow Ups
- Re: "This is completely wrong" - DevillEars 12:21:23 03/09/07 (2)
- Re: "This is completely wrong" - Drew Eckhardt 13:50:51 03/09/07 (1)
- Re: "This is completely wrong" - Paul Joppa 14:36:55 03/09/07 (0)
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