I enjoy the way my system is set up.
I have 2 of the channels power each of the rear 5 1/4" speakers.
The remaining 2 channels have been "bridged" mono to power the 2 10" DVC subs...
I have the amp's gain turned to about half or so.
My head unit also has a sub control so I don't have the bass up too high since, it can give me a headache after only 10 minutes or so.
I have drilled holes throughout the first aid kit door and cut a large hole out of the plastic tub that holds the contents of the kit. I kept the plastic tub in so it would keep the door lid down.
I have also put rubber grommets around all 4 of the rear licence plate screws underneath the licence plate.
I did the same for the washers with the 6 screws holding on the back bumper. Also watch for the plastic covering the back of the trunk it can cause rattling.
I haven't had rattling up to now but, remember I don't have my gain up very much (60%)....
Good luck with you sound man!
190E 2.6 - 244 000 km