bad turn off thump

[pickup1 5,000+ posts]

just switched out my rockford with a nine.4,and getting more engine noise and a bad turn off thump.

i moves my rca's away from power wires the best i could.

regrounded my ground.

but heres a quirk,i have a pathfinder,in the back,behind the seat,over the fenderwells,i mounted 1 amp on 1 side and the other on the other side.

2 ground points,should i try to ground them all in the same spot?

it didnt do it with the rockford either.

i just got both amps friday,used from the sale section,but only 4 months old!

thanks for the help.the rca's are pretty new also.

does it sound like a ground loop?

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[wesl56 10+ year member]

thats a ground problem... ground the headunit to chassis