Missed Connections

I am using a Parasound Hint 6 integrated to drive my B&W 606 S2's. It's rated at 160 wpc. Also in my system is a Carver Sunfire Cimema with 5channels driven 200wpc. Currently the Sunfire is only being used to drive center and surrounds leaving 2 channels free. Those channels have no source input. Is there any reason I can't use them to bi-amp the B&W's effectively giving them 360wpc? My interest lie in having the power to listen at lower volumes with clarity.