i need some major help before i go crazy here. 2 probs....1)im running 3 amps and im getting back feedback sounds like the altenator. i was told to run my power wires opposite of my rca's but the feedback sound didnt change. 2)when i plug both rca's into the 1500 watt rockford fosgate punch amp powering 2 10" mtx thunder 8000's (and yes i have a capacitor) they have no punch to them but with one plugged in, that one sub dumps. is my deck just not powerful enough? ive tried switching the plugs and the subs but same thing happens even unplugging the rca's powering my 6x9's it still does it. so if you have any answers that be great thanks

 

ground, get better ground.... check all the wires, if you are using the chasis make sure the paint is grinded away before putting a ground connection on it..

other wise run the ground all the way back to the battery..