My solution has been a thinnish speaker box designed for pickup trucks and a
12" subwoofer behind the drivers seat.  It is capable of ridiculous volumes
(I didn't set out to do that...)

Pros:  includes a free back massage while in use, able to handle as much
power as you want to throw at it up to 1000w, easy to install/remove/put
outside for camping (if you are into that kind of thing, I am not)

Cons: Expensive, requires amp (which I have in bench seat), drivers seat
cannot rotate nor slide back all the way.  I have never rotated the seat so
dont miss it.  Need to take it out to access aux battery (which is hopefully
almost never)

I am acutally thinking of "downgrading" the setup to a modestly powerful
head unit with in-dash CD player and seeing if I even need any subwoofing at
all.  I dont like the cd-changer setup the van came with, and don't really
ever boom the bass enough to justify such power.  It was fun to test though,
I admit.

On 3/21/06, The Bus Depot <vanagon@busdepot.com> wrote:
>
> > A related question: has anyone put a subwoofer under the
> > bench seat? Any tips? I was thinking I could put a 10" and
> > have the box custom built - but it's costly.
>
>
> I had Tweeter build me a custom box to fit a 10" sub, designed
> specifically
> to fit in that location (angled to match the angle of the firewall).  Ran
> about $300 including the sub, as I recall, and sounds great.
>
> - Ron Salmon
>   The Bus Depot, Inc.
>   www.busdepot.com
>   (215)  234-VWVW
>
> _____________________________________________
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>