6 months ago, I installed Infinity (not Kappa) speakers in the doors and rear. Although the low end bass was cut compared to the stock speakers, the doors had a lot vibration, and the rear deck rattled and echoed through the trunk.

I reinstalled the stock speakers in the door, and no vibration. I replaced the rear with a set of pioneer 3 ways; better bass, but still tremendous rattle. Finally, I reinstalled the stock speakers in the rear, and the problem solved.

Now that it's warm, I want to try again. Did anyone else have problems with vibration/rattle w/ aftermarket speakers? If so, how did you solve them? Or, does everyone just Dynamat the hell out of their cars nowadays?