Problem with my sub, and possibly my amp...
 

So i've installed everything and the amp appears to be okay, all the power lights are okay etc, etc... The sub is working, but there is some funky buzzing noise coming from it and it hits really softly. I know this is totally unclear but its really hard to explain. Anyone have any ideas of what i should do?

Could be a blown voice coil or a separated voice coil.
Best bet is to bring it by a sponsor's shop and get it looked at. Advice is usually free!

Could be you didn't screw the subwoofer in tightly enough. Or if it's an old sub box maybe the old screw holes are leaking air.

I've also seen loose dust caps on the subs cause that annoying buzzing noise.