you can use the rear channels even if your not listening to MA movies. Using Dobly PLIIx makes use of the rear channels, I used that mode all the time. It could be your problem stems from the way you have the 80's hooked up. I think you should try the good ole fashion way of using the standard l/r front channel jacks, and use the rears for rears. Also, you have not said, but if you have removed the gold bar between the speaker terminals, place it back. This is not true bi-amping.


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