Originally Posted by Theonetruegreg
And a thanks to you Don
One final question....
....Considering we now know how the 1.5QR's are wired, running no pass-filtering from the receiver using Bi-amp mode to get the power needed, will this cause a short in the system due to each channel now getting two amplified signals that now combine again? (I am not completely certain that this statement makes sense beyond my own brain)
Actually, that is a very good question! If the lows and highs were perfectly filtered there would be no interaction between them and you would be fine. In the real world, filters do not drop to zero instantaneously outside their passband, so the two amps would be "talking" to each other in the overlap range.
Now, if they were perfectly synchronized, again it would not matter because the signals (amplifiers' outputs) would move together, no harm no foul. Alas, again the real world means there will be slight differences in each amp channel, and the AVR's filters will introduce phase shift in each channel that may not be perfectly the same. In that case, the two amp channels will fight each other, to the detriment of the sound and quite possibly damaging the amps.
Bottom line: if the speakers are not designed for bi-amping, you should NOT do it!
HTH - Don
p.s. Thank you mrlittlejeans -- I would have assumed high and low inputs were to facilitate bi-amping, and might have had some ineresting times...