Bridging channels on a Infinity 7541
 

I have my amp bridged to 2 channels, powering 2 speakers. Right now I have 2 sets of RCA cables going to the Front and Rear input on the amp. Is it possible to use just one set of RCA's? The amp has a "Summed Input" for the RCA's, but when I plugged the RCA's into it there was no sound at all.