“What plugs in to the rca jacks on the metra.Thanks”

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• The RCA jacks are for your RCA cable leading to your amp. Most aftermarket head units come with RCA ports in the back of them. This just makes it so those that want to keep their head unit that doesn't have RCA as an option.

  Answered by JMC2543 9 years ago

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• It output the signal for example ( an amplifier to be hooked up to a subwoofer speakers )

  Answered by Newbie 8 years ago

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• rca cables that runs to your amp

  Answered by i8it 9 years ago

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