I removed 1st aid kit in my w123 and have a sealed box subwoofer in the trunk. Plenty of bass for me, but I just wanted good sound quality, not booming bass. I think what you are trying to do is going to require a lot of work, but it might work out.

__________________
RT


1984 300D---Sold
1995 E420 - 106K - Brilliant Silver Metallic/Orion Gray --- Sold
1984 300SD - 151K Manganese Brown Metallic/Mostly Black --- Sold
1982 240D - 79K - Manila Beige/Palomino---Sold