The speaker thats actually on the door seems to be blown out or something... I'm not sure. It seems if I have ANY bass or treble on, it sounds like a really annoying rattle. What are the causes/solutions to this? I'd rather not put a whole new stereo in. This is the mach460 if it matters.

 

The cause to your problem is 1 ford factory systems suck., 2 your probally running too much bass and creating distortion.3 could be a tinsel lead hitting the back of your speaker.

 

If the speaker has no bass theres a good chance that it is blown.... dont worry now you can upgrade!

 

well all you will hear out of the lows (in the door) is bass and the ones up top are mid / high so you will hear no bass, The install kids are easy for these just redo the system.