Noise

eh...how r u powering ur amp????? or should i say what are u powering your subs with(i.e  High level input.....RCA's.....Pac adapter)

Yes we do need more specifics on your situation.  Most likely you need a turn-off pop eliminator.

But how you would connect this will depend on whether or not you have a factory or aftermarket head unit, and whether or not a line output converter was used (as opposed to using the built-in high-level inputs of the amplifier).

Usually this problem is caused by using an amplifier that does not have a "soft-on" or "soft-off" feature.  When the vehicle is turned on, the head unit comes on first, and then the amplifier.  This is because the head unit actually supplies the amplifier with a turn-on signal, but only once it itself has turned on.  The problem is that the head unit starts sending voltage via it's preamp outputs to the amplifier, before the amplifier has turned on.  Even if there is no sound output at this instant, there's still voltage going through those inputs, and this is what causes the amp to make that popping sound.  The way around this is to mute the amp's signal inputs before the amp is turned on.  This way, once the amp has powered up, there will be no signal to amplify, and thus the popping noise will be eliminated.  After a pre-determined interval (usually less than 1 or 2 seconds), the muting will be removed and full sound output will come out of the amp.

This problem is more common when turning on components than when turning them off, but that's not to say it doesn't happen during turn off.  However, the same principles apply to the turn-off sequence--input voltage must be eliminated before the amp itself powers down.

Probably you'll need something like the N-807 from David Navone, but let us know the specifics of your system so we can tell you for sure what you'll need to use.