John,

I think I might not have been clear enough in my first question. I'm not necessarily asking if all channels will peak simultaneously, but rather, should it be expected that all channels can peak, at some point, to the same level. For example: if reference level is 105dB max, then should it be assumed that the center and rears could reach that level? Or, would it only be the front L/R to reach 105dB?

Alan's article on speaker power requirements (http://www.axiomaudio.com/power.html) lists 6dB loss per distance doubled. Is that an outdated or too conservative number?

When you're estimating power, do you use anechoic or in room speaker sensitivity ratings?

I have a rather large room of approximately 5500 cu/ft when taking into consideration the cathedral ceilings. How do you think the size will affect the power calculations if at all?