one thing i just wanted to add, if your headunit doesnt have RCA outputs, you can still hook it up to an amp. low level inputs use RCAs, high level use speaker wire signal inputs. RCAS are better quality but if a radio doesnt have them, you can use the high level inputs on a amp or get a new radio. Also not all amps have high level inputs so keep that in mind too. One other thing i learned.. dont attach the amp to the metal body directly, when you do that, you make then entire amp casing a negative ground and it could(not always) cause problems, screw to wood then mount the wood.
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