Originally posted by XterraAdam:
Some amps have a passthrough for the input signal, and you're going to need power.
If your power wiring is insufficient, you'll need to either run an additional wire to the new amp, or upsize your existing wire.
If your amp doesn't have a passthrough, you can Wye off the existing RCA's or run new ones from the head unit.
The problem with the Wye connections, is that you'll need a crossover of some sort, either built in the amp or added on. You'll also loose your fading capability in the head unit to set your subwoofer's level relative to the full range complement.
If you have any doubts in yourself of doing this correctly or safely, PLEASE let a professional do it for you.
This is exactly right. Only thing I'll add is to check what gauge of wire is recommended by each amp. If the same, then get a dual amp wire kit. If not, just get another single amp kit and wire it that way.
And most amps (that are worth their salt anyways) have input passthroughs so you should be able to run rcas from 1 amp to the other for the signal.
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