I have only one hooked up to the amp now. Could the amp require both to be hooked up before it works? I am using a y splitter from the lfe output on the sub, connected to two audio cables which are connected to 2 1/4" stereophonic adapters which are plugged into the amp. I have heard that sometimes amps do not work if both inputs are not filled with speaker wire. If that is not the problem, then what is it? I know the subs work because I plugged them into the standard speaker spots on the receiver and they put out bass(a suprisingly large amount at that). HELP!