[huskeyeskimo]

Well right now I am running 2 12" Alpine type- R's in my trunk and love the way they sound. It's just I'm looking for a way to have that all round sound when the subs are off without the damper in quality while they are on. Don't really want to go down to 10's in the trunk. Will 6.5's vibrate as bad as the 6x9's if I put those in the rear deck?

I thought it was the fact that you have subs in the same enclosed area as the magnet of your rear deck speakers that caused the loss in quality, because the subwoofer wavers clashed with the 6x9's waves. Not the fact that the rear speakers vibrate, or cause the buzzing sound.