After reading so much about the double filtering effect, etc. I hooked up the front L+R speakers through the subwoofer as recommended by Polk. However on these front speakers only I hear a buzzing despite having no volume on the reciever. I hear silence from the other speakers. I rechecked the wire connectors and it appears they are well connected (16 g wire). The setup was as suggested (subwoofer=no which automatically sets the front speakers to large, crossover was 100). The subwoofer volume was at 60%. The buzzing did not go away with lowering.
One obvious next step is to hook up through the subwoofer out.
I will try that but any ideas on the buzzing?