If you use the pre-outs for the 2 front channels, the other speakers will still be powered by the receiver. If you want to power the center channel with it's own amp you will need a 3 channel or a mono amp.
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Thanks guys. I hadn't yet looked at the receiver or the manual, and this would have become clear instantly. I assumed the pre-out was a single out that took the entire signal away from the internal amps. Now I know. Thanks much, as always. On to looking for good used 2 and 3 channel amps for the 803s and the htm1. Jeff