Originally posted by Rycechyk
If your resonating chamber is filled with deadening pillows and sleeping bags, then yeah, they'll absorb the sound and you'll lose a little bass. But on the other hand....it should reduce trunk rattle 
Actually, now that you say it, the trunk DOES rattle more when there is nothing in there --- although the VOLUME of my bass, I notice now, goes up and I can crank that bitch waaaaay loud when the trunk is empty, the rattles and vibrations do go away when shit is in the trunk....yet, will this affect how the bass travels OUTSIDE the vehicle when my trunk has shit in it?