OK, here's what I'm about to install. Looked around a bit, didn't see a thread with this question.

Kenwood DNX5120 HU
Infinity Kappas (Componants in the front, 2-ways in the rear)
10" Infinity Sub under the drivers rear seat
2 Alpine Amps; a 4 channel for the speakers, a mono for the sub.

Now, the Kenwood only comes with 2 RCA outputs; 1 for Front, one for Rear/Sub. How do I go about sending the signal to the amps; is it as easy as splitting the rear RCA and sending it to both amps?

Thanks for any input.

does the four channel have an output?

By jove, it does! Genius! That solves my problem, doesn't it?