| If its stock, it may be time to upgrade your changer to something newer. Get a in dash HU, that will solve the problem. Try positioning your sub as far away from the changer as you can. Dynamat may work, but you would have to stick it directly onto your Changer. However being that it is a small independant piece of equipment, the whole unit itself may still shake in the brackets. Its not like a trunk lid or equivalent that has a lot of size and can be muffled with a sound dampening agent.
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1996 318i
5 Speed Manual
Alpine CDA-7895 Head Unit
12" Alpine Type-R, sealed box
Pioneer 400w amp for $20 at a yard sale (to replace my fried MRV-1507)
Infinity Kappa 4" 2-way speakers(rear)
Infinity Kappa 5.25" component speakers(front)
Debaffled airbox, K&N filter
Tracked Mud on carpets
Shampooed and cleaned carpets | 
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Linear Mode
