I have a sony xplod HU, nothing special, and it has a selectable rear/sub output. i also have xplod 6x9's. im looking into buying some subs and i was wondering, if possible, what would be the easiest way to hook up 2 amps to that one output? can you just get a Y adapter on the RCA cables? i have a small old pioneer amp already, so i don't wanna buy a multi-channel amp where i can run both high and low pass.