Amp RCA inputs

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Why do some amps have two sets of rca inputs? 

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  • well, if they are (4) channel amplifier's, then they'll have (4) RCA inputs. If they are (5) channel or (6) channel amplifiers, they'll have (5) or (6) channels respectively.

    Now, some amplifiers have pass-through RCA outputs so you can daisy chain amplifiers. They are RCA connectors, but are market (output) and not (input).