I recently purchased a RX-V575 receiver and am having trouble getting my subwoofer to work. All of my speakers (Epic Sound 7.1) are working fine but I am not getting any bass from my sub. I have a non-powered subwoofer with only 2 input and 2 output speaker wire connections. I tried using the bi-amp ports with the bi-amp option enabled but that did not work. I tried hooking my sub up to the front speaker ports but that did not work either (though when I chained the front speakers from the sub, they worked fine). I am positive the sub works and that the wires/connections/positive and negatives are all correct and working. Since I am completely new to sound systems I had a friend help me set some of them up yesterday. The sub was working fine then but I did not have enough wire to set it up like I wanted. After buying wire today, unhooking what he had done previously and getting everything laid out like I wanted, I ran into the problem with my sub. He said he hooked the sub up through the front speaker ports which is why I tried it like that tonight (He was drunk and I do not recall where from where I unplugged the sub.) The guy at bestbuy is the one who suggested using the bi-amp ports.