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Question:

Why does the power cable for the amp need to be ran away from the RCA cables?

Mine isn't so I'm just wondering what it would do.

Answer:

the power noise will bleed through the lines.......which means u would have interference noise in ur system.....and even alternator noise(were buzzing/ringing high pitch whine increases with engine speed) sometimes.......
the music will be distorted
A thick power wire that carries a lot of current or power has anEMF - electro magnetic field around it. This field can will pass into the RCA cables - the cables that carry sound from headunit to the amp. You want the RCA cables to be as 'clean' as they can be for the best sound signal and quality. This field will interfere with the RCA's, especially low quality cheap RCA's. causing interference and poor sound quality.

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