How can I get rid of feedback from my amp?

Question

I have a Power Acoustik 980 Watt amp running a 12 inch Power Acoutisik m**o. And the kid that had the car before me ran all of the wires previous to me getting the car. The power wire, and speaker wire is all run through the center console and though the back seat to the trunk. And Also the RCA are run in the same place. Is this why it's causing feedback? It's very annoying and there is no feedback from the speakers only from the sub. (Which is fun by the amp.)

Answer 1

Ground the amp better.  Add another ground wire off your battery going to the body or somewhere else also.

Answer 2

you don't want your RCA next to your power wire this causes feedback. also you could get higher quality  shielded RCA

Answer 3

Although the rca and the power cables should be run on different sides of the car, this in and of itself should not cause "feed back".

If you are describing a "pop" from the sub when the sound system is first turned on, this is called an amplifier pop.  It happens when the amp is turned on before the radio turns on and send signal to the amp.  If the amp turns on first, it is waiting for signal and there is nothing there, suddenly, the rca gets signal and there is a POP sound.  There is a part called a POP Stopper, and it delays the turn on of the amp until the radio turns on first.   This theory can be tested by disconnecting the remote wire for the amp, then turn on the radio.  after the radio is on, connect the amp remote, if the POP sound goes away and the sub just starts to play, this was the cause.  You can get a Amp turn on delay part or put a switch on the remote cable.

If you are getting a continuous Low Humming from the sub, there is a Lot of distortion in the rca signal from the radio (not likely) or your amp is acting up, its hard to test but  if you have a spare rca cable, try running an rca from a portable radio/boom box/any other audio device into the amp and see if you still get the humming, if its still there, then nothing in the car (radio/power wires/rca's) is causing the Humming (start checking the amp, settings, ground wire.  If the humming goes away, then the problem is "upstream" and you can try testing the radio/rca's/remote wire.  Sometimes a real cheap RCA cable can cause humming

good luck