Okay so hear it goes, I have a 2004 kia spectra and in it i'm running two kenwood 12s. The problem that i'm having is that I am getting tons of vibration off the rear speaker panel that the factory rear speakers are mounted on. It's really hard to enjoy the music because all i seem to focus on is the rattling that i hear. Can anyone suggest a fix for this? Also what are some suggestions for an interior system to go with? After i fix the vibration i plan on replacing my interiors.