Originally Posted by infamo
but if one did by such a receiver, how would u setup the speakers. I'm sure they just didn't add extra channels without doing proper analysis, and make a proper diagram on how to place them.
The presence speakers are placed on the front wall (in 9.1/2) and back wall too (in 11.1/2) outside the front and rear speakers and, like the surrounds, about 6-7' high.
They are there primarily for simulating the acoustic of a performance venue with appropriate reverberation. In the front, they can also assist in raising the perceived height of the dialog, which is helpful when a center positioned below a display produces dialog that otherwise is perceived too low.
Literally decades ago Yamaha conducted research into live acoustic spaces and built the results into a VLSI chip that they use to simulate actual performance spaces around the world.
I would love to hear from some members that use the presence speakers as to their effectiveness for different types of music. The theory is great and I would like to know how it does in practice. This is an aspect that has always intrigued me. Lexicon offers much the same but without the presence speakers.
For the .2 sub LFE chanels Yamaha allows dual subs in either mono, L/R stereo, or front/back configuration (at least in the Z series).