Pioneer and CV Power Amp Help?

Hi, im currently running a Pioneer VSX519V and two Cerwin Vega VE12s. As i would like a bit more oomph without distortion i was thinking of a power amplifier. As each channel, say for instance "BD/DVD" channel has both input and output, would it be possible to get a phono to Jack cable and hook up a power amplifier? Thank you for your time :)