What does the RCA output do on a car amp?

downbey258

New member
I have a sub amp and I'm thinking of putting a 4 channel amp for my speakers through a dual amp setup. I've always wondered what the RCA outputs on the amps connect to. What can they be used for. I'm not talking about the inputs that go in the dash radio, I mean the outputs.
Are these outputs used for a dual amp setup. If yes, how and what are they used for?
 
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