this is a good question- my buddy's having sound problems with his audio setup. He's pushing about 1000w rms through 3 amps. However, his ground wire is pretty tiny, and it connects to all the amps + cap, it's deifnitly not 4g or 0g. will this affect anything?
yes, that can cause problems too, you should upgrade that wire to a 1/0AWG if you have that much running through 1 ground. or run several smaller gauge wires.