AVS Forum Special Member
Join Date: Dec 2007
Location: Southern California
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The thing to be aware of is that the real power limitation is the power supply of the receiver. Since your receiver is set up for 9 channels, you probably have enough total power available to run almost any 5 speakers, except for some very low-sensitivity or low-impedance speakers.
As long as all of the power is coming from that single power supply, it doesn't really matter if you bi-amp or not.
The only real gain in power would come from using a separate 2-channel amplifier rated at 100 watts per channel or more to drive the front speakers.
This would take a big load off of your receiver, and provide better power for the front speakers.
Of course, this is only possible if you have preout jacks for the front 2 channels, which you apparently do have.