I've read all the posts in this section about subwoofer's but they all apply to the W124 that has the First Aid kit on the rear parcel shelf. Does anyone have any suggestions as to what to do in a W210 (E420)that has it's First Aid kit in the rear armrest. I am swapping the headunit for a Pioneer one with MB Quart speakers all around and PPI Amps. I am now stuck on what to do for the best bass response - bandpass, wavebox, ported, free air or what? What are the good designs that don't swallow up all the trunk space and what make subs go with MB Quart speakers. I am having 6.5 components up front, 4 inch coax's on the rear doors and 6.5 coaxs on the rear shelf. Anyone been this route?