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Nice summary. I didn't find any problems with it.

Might be good to cover power requirements for the speakers. You touched on it briefly when you explained that +3 dB sensitivity cuts power requirements in half (I knew that). But it isn't as simple as saying "I have 10 ten-watt speakers, and a 100 watt amp/receiver, so I'm OK". (Yes, that system probably wouldn't make a lot of sense to build, but you see the point I hope.) Power is needed to drive the speakers at any given volume, but it also is to improve (for lack of a better way of saying it) the definition of the sound produced. Some folks buy big wattage amps and speakers because they're thinking "louder" (which it can be), but really the added power makes for better sound reproduction.

Also, some comment about the relative quality of given speaker sensitivities would be good (e.g. "92 dB is outstanding, 89 dB is OK, 85 dB bites the big one", etc).

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