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Re: Excellent document, thanks Michael. Further questions.

Pure speculation on my part, but I suspect it's because of the inverse square law of amplifier power required to generate a particular sound level which increases exponentially as distance increases.

Basically, if the speakers are relatively close, you don't need a lot of amplifier power to generate the recommended average monitoring level of 78-85 dB SPL. If you sit twice that distance, you may find you need hundreds of watts to be able to generate the same sort of levels without clipping. If you sit further still, suddenly you need thousands of watts to generate the same level.

Sure, if you want to overlook a few rather important items and paint with a very broad brush you need thousands of watts...

You haven't considered room gain of 3-4dB which cuts down power requirements, and you haven't made any considerations for speaker sensitivities which can be as low as 80dB (ATC passives are really low in sensitivity) or as high as 100+dB.

So I'd say that the middle hundreds of watts is a better estimate given a typical sensitivity rating in the upper 80s, and a typical room gain of 4dB both of which should be considered.


Regards,
John Kotches

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