Ascension - first things first, you need to update your signature now that the 500 is in. \:\)

On the vibration, sometimes wires come loose inside near the driver. If they hang close to the woofer, they can vibrate when the woofer moves and cause sounds like you are hearing.

If it's bothering you enough that you feel like removing the woofer, it's fairly easy to check to see where the wires are hanging.

Jason

Epic 80-800: HG Cherry