Quote:
Originally Posted by Gogar
I guess what I'm saying is, What Manual? The receiver manual? or the speaker manual? And how could either manufacturer have any clue what other components you're going to be using, and what kind of SPL you'll get?
It's Bush's fault. And the gun lobby. 
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For the most part the speakers are a fixed entity. We adjust the current sent to them, so my reference is to the amp/receiver. The amp doesn't know what the efficiency or ohm rating is for any given speaker, using test tones allow for compensation. As each speaker sounds its tone, adjustments are made when taking readings (SPL meter) from the "sweet spot" of the room. This is usually the triangular spot drawn among the two main speakers and the point they intersect at the seating area.
Not every room allows for perfect balance or reflection/reverberation, so calibrating loudness and the distance is a way of compensating to get the best sound possible.