Hey guys, was wondering if any of you AV savy guys could give me some help getting started please. I'm entertaining the idea of installing a double-din DVD monitor while keeping my headunit as well. All my speakers are hooked up to my 4-channel amp and my sub is on a mono. Is it possible for me to use RCA splitters to join my headunit and monitor audio-outs into one, then plug that into my amps?