tanstaafl:

[homer]Your ideas intrigue me, and I wish to subscribe to your newsletter.[/homer]

Seriously though, what kind of subs are you running? Are they in a sealed or ported enclosure?

It's really a pretty neat idea, for someone with a wagon or hatchback. I would think that you'd have one huge problem, though - as you get into the higher frequencies, don't you start to get some serious directionality going on? I would think it would mess up your imaging something fierce.