i have two speakers in my room, with an audio cable running to a hole in the wall. There are four wires in this cable and I connected these to an amplifier in hopes of running my ipod through my built in speakers. I have a problem however. When i plug in the ipod, to the CD or Video 3 or any input by using a minijack stereo to RCA adapter, I cannot connect both RCA outputs to the receiver. Connecting just one output allows just one speaker to work perfectly, but when i connect the other, the volume goes way down and there is lots of distortion. Any suggestions?