I thought something inside my right subwoofer was loose as it was sounding bad.

I was digging around that area a few days ago while I was photographing the set up for the illuminated sill plates. I was thinking it must have been the yellow fuse box making the vibration. After alot of pondering, I tried to move the passenger seat forward thinking it can be one of the factor for the odd sound. :idea: And buaalaah....I was right..the backseat of the passenger seat was too close to the sub speaker making that odd vibrating sound.