Tuning Vibe Amp And Sub. HELP!!!!?

Generally noise problems are related to one of three things; Poor gear, Poor ground, Poor cables. Since you did not change the cables or the gear, you might not have re-grounded the amp well. This is always the first thing I recommend checking. Do not use seat bolts, or existing bolts in the car. Find a solid piece of metal, sand the paint off and run a #10 screw through your ground terminal into this spot. I would guess this would be it. Having the gain all the way up on the amp can also cause slight noise. You should never have the gain much past 1/2 depending on the radios output. I also agree with the rca cables being close to the power, you don't want this. Make sure you didn't rearrange the cables and sit them on top of each other when you installed the amp. But this is most likely not it. Now I will give you the worst cast scenario. You had a bad ground all along and what most amps will do is try to pull ground through the RCA jack. The problem with this is the RCA jack has a very low level ground and what happens is that you can burn a trace on the radio's circuit board. Once this happens you almost always get noise from that point forward. Hopefully this did not happen or you will need to replace the radio eventually. I am guessing based on what you did the issue is the ground wire.