Question about Rockford Fosgate Power T3002 Car Audio Amplifier

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I have rockford fosgate t3002 amp with 6 gauge wire. a pioneer 12 premeir sub svc 4 ohm. maybe i should get 4 gauge wire but the dude at the shop said 6 would be fine. now my problem is when the car is off the sub straight up dumps. when the car is on and running it makes a crackling/rattling noise. its not bridged because theres something wrong with the right channel. when i tryed bridging it, it jus pushed the sub to the peak of its excursion nd stayed there. sounded like poop. but the left side works fine. somebody help. thanks.

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