Okay, I bought an older karaoke system, which I am using as a speaker for my iPod and an amp for my guitar. As you have probably deducted from that, it has RCA stereo auxiliary inputs and 2 mic inputs. I plug my iPod into the RCA aux in jacks, and it is sending out a stereo signal. The cable I use is a special cable originally intended for an audio/video cable for my camera. It's wiring scheme allows me to use it as a 3.5 mm (1/8 in) male audio plug to the two stereo, RCA male plugs. I press play on my iPod, and of course music comes out. The "amp" has a balance pot on it (pot meaning knob). When the balance pot is centered, the left channel is full volume, but the right channel is weak. To get the full right channel, I have to turn the pot all the way right, which of course blocks the left channel out. There is a "sweet spot" around the 4 o clock position that evens out the channels, but they aren't as strong.