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Sorry its a little long but any help is greatly appreciated

So i recently built a floor for my trunk and relocated the amp closer to the opening. In doing so i had to extend the Power cable, ground cable and remote wire using some extra cable i had laying around. For the power and ground cable they are both using 8 gauge from the battery and then from where i extended it the only thing i had was 6 so i used that for the rest. Now i mounted the amp sunk into the floor which is alot closer to the road then the previous location of my back seat. Now i dont know if its the location of the amp or the difference in wires thats causing the unwanted sound coming from my sub, but any information will help thanks guys

No one has any information,

 
Rep Power: 281

make sure you got a good ground. If so then run an 20-18 gauge wire from the amp ground to the radio ground. You tend to experience ground loops in cars. 99% of the time it is the ground. If that don't fix it get better/new RCA's....oh and make sure you ran your rca cables on the opposite side of the car from the amp power from the battery....there ya go...amps 101.