The Westfalia is a unique aural environment due to the high interior
volume.

With the front door work, particularly the mid bass driver with
aforementioned enhancements, and a 12" sub firing out the dynomatted
closet, it is possible to get a nice tonal balance in the van.  The closet
was a good match with respect to volume for the sub I installed..and still
is useable as a closet.  Dynomat was essential as the closet is not sealed
in stock form.

I did my audio upgrade in several stages, the last being the bass drivers
in the door.  I found that even with a sub in the rear, normally fine in a
car, the front of the van lacked low end.  Low frequencies are somewhat
omnidirectional but in the Westfalia, the rear is a long way back.

Max's stiffening of the lower door area is a great idea, and probably
improves bass "cleanliness" appreciably.  A little extra time with the door
will be rewarded ... as you'll be sitting next to it most of the time.

Max, what's the rest of your setup?