well the head unit itself has a right and left channel RCA input, if i get a converter from RCA to 3.5mm on each channel, i'd still need to join them. I've done that, too, using a 3.5mm splitter. I can see how i turned it into a single channel sound, but, aren't headphone 3.5mm plugs stereo? the only 3.5mm cable i can find has only 1 wire running from both male ends, which works fine in other head units with a front aux input