Hi, I need to power my rear surrounds with an extra amp. Is any old cheap amp good? I don't need a lot of power so I'm not concerned about wattage but will it affect quality? What is best for a 6.1 setup though? A rear center or a pair (monopoles/bipoles/dipoles?)? Or is this a purely subjective thing? Plus, the pre-outs on my receiver for the rear surround channel is R and L. If I wanted to have a rear center, how would I go about hooking this up? Thanks for your time and help, this place is awesome.