6.1 speaker setup on 7.1 receiver - how to wire?

[MRR]

This may be a simple question but;

I am considering purchasing the following to replace may aging Sony STRD-545 and a 5.1 Sony speaker set.

Denon AVR-3806 7.1 Receiver
Polk RTi8 (pair) Main
Polk FXi3 (pair) Suround
Polk CSi5 Center
Polk CSi3 Rear
Polk PSW505 Sub

I have looked online, FAQ's, 3806 manual.... BUT I cant find any reference exactly how I should hook up the Rear CSi3 for the 6.1 as opposed to the 7.1 config...

Left REAR?
Right REAR?
BiAMP?

If I only hook up one channel of the rear will that cause a problem?

Should I be looking for a 6.1 Receiver instead?

Already wired for 6.1, 7.1 is out of the question at this point.....

Thanks!

[John K.]

MR, welcome. You missed the Note at the bottom of the speaker connections diagram which states "When using only one surround back speaker, connect it to the left channel".

[lanion]

More to the point, the same signal is sent to the rear left and rear right speakers anyway, so it shouldn't matter. this will change with upcoming 8 channel formats, but for now it shouldnt matter.