HU will have RCA wires output in the back. You will use that as your audio signal to the amp/amp. From the amp, you will run speaker wire to the speakers keeping polarity the same for all apeakers (+/-). If the speaker set comes with a crossover, you will run then amp to the crossover, crossover to low/mid pass (LP/LF) to the big component speaker, and the high pass (HP/HF) to the small tweeters.
Quick breakdown for you
-Headunit gets connected to wire harness, antenna, back up cam then RCA to amps
-Amps get power from battery (with a fuse or breaker in between), ground (any big metal piece like belt or seat bolt), remote from wire harness, speaker wires out to speakers or crossover then speakers..
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