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Not knowing what head unit you have, I'd suspect it might have a front to rear fader if it doesn't have an A-B switch. That being said, if it were mine, I would start with replaceing the speakers as I said earlier it wouldn't be wasted money IMO.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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