Hello all, I have a TX-SR605 and would like to add an external amp. My first look told me I have no pre-outs on this receiver. But could I use the zone 2 line out to feed an external amp? Currently I'm running Polk RM3000's LF, Center, RF, RR, LR, and a Velodyne 12in sub. I thinking of a little speaker upgrade and was thinking I might need a little more power for the times I really want to crank it up

I'm really at the beginning here and would like to use what I have as far as the receiver is concerned but something tells me this might be the wrong way so any advise would be great.