don't do that! just use the 4 channel you bought. 50W, 100W, whatever, not too likely your going to notice with your rear speakers. but whatever you do don't "piggy back them"
you could run the fronts with 2 channels of the 4 channel amp and the back with the other amp, but it's pretty much a waste of time.
you only need to worry about lots of power with subs or if your going really highend (doesn't seem to be the case)
good luck
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