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Message: <blockquote data-quote="Rich B" data-source="post: 8386196" data-attributes="member: 571023">4 RCA channels will provide twice the preamp volume (ea. channel is typically 2.5v to 5v) than 2 channels will provide, also (in theory) 4 cables double the noise rejection from the car's electrical system in the 15 to 20 ft of cables running front to back.Keeping the 4 channels separate would be optimum in maintaining stereo separation as well</blockquote>

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