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Re: Excellent document, thanks Michael. Further questions.

Chris, you seem to think that I overlooked it, so I'll play your game.


Let's see 8 ohms... 85 dB sensitivity.
1m = 1w.
2m = 4w (Recommended distance in the paper is 2m)
4m = 16w

Now let's talk about a 20dB peak...

1m = 100w
2m = 400w
4m = 1600w

Yep, that's over a thousand watts needed, you're right on the money. Of course the inverse square law works well only if you listen in an anechoic chamber or someplace that's free of echoes. Outside works, assuming you have sufficient space to have an anechoic region. How many of us happen to listen under these conditions? I can't speak for the conditions of your listening room, but I do know that doesn't resemble the conditions of mine.

So let's correct this, by applying a fairly standard 4dB of room gain to these figures to come up with what are much more realistic figures for the actual watts required in a room that is not an anechoic chamber or outside and free of reflections.

1m = 40w
2m = 160w
4m = 640w

Wait, where did those thousands of watts go? This is what happens in real rooms where people tend to listen at distances much closer to 2m than 4m.

So yes I did think of this when I gave numbers in the "middle hundreds of watts".


Regards,
John Kotches

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