Join Date: Feb 2013
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The Sony STR-DH820 AVR doesn't have 7.1 (or 5.1) pre-outs, so you can't use it with an external amplifier.
It has 7.1 INPUTS, and 2 subwoofer pre-outs, but no pre-outs that could drive an external amplfier.
If you want to use a receiver as your surround processor you'll need a decent one with pre-outs (a nice one would be the Yamaha RX-A820), coupled with (say) an Emotiva XPA-3 external amplifer (3 x 200watts), then use your receiver to drive the two surrounds (plenty of power for that duty), and the XPA to drive your front left & right, and center channels which are the most demanding.
The Insane Pink Care Bear's Home Theater Set Up:
Marantz AV 8801 Processor, Emotiva XPR-5 Amplifier, Panasonic 65" ST30 Plasma, Yamaha BD-S2900 Blu-ray, Yamaha CDC-697 CD Player, Yamaha TT-500U Turntable, w/Signet TK5e, JBL ES100 Fronts, JBL LC2 Center, JBL ES30 Surrounds & 2 JBL ES250P Subwoofers