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when you hook up the output of your alpine to the wiring harness it goes directly into the amplifier, not the speakers. this is known as a high level input. Amps either take a hi-level (speaker level) or low-level (rca's)input Therefore your speakers will still be using the factory amp for power & crossover duties. There is nothing that will be doubly amplified. the Factory amps use high level input, VS. most aftermarket amps have input's for both. You have nothing to worry about just wire the plug up correctly and plug it in...
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