Received lots of great advice recently from some Car Audio Installers here in Vancouver.
One guy worked on a couple Boxsters and another owned a 996 and .
What I've been told:
a) Subs between the seats won't be ideal as bass doesn't sound great right beside your ear. Lower is better, will sound more natural, and has opportunity to bounce around and get a deeper sound
b) Subs facing straight up on deck can be powerful, but will definately cause the roof mechanism to rattle when the top's down. Not good.
c) Front trunk could sound good - but likely you'll feel it more than you can hear it. May want to port through RH drive steering column hole to improve somewhat.
d) Footwell - may be best sounding option if you are willing to give up on some foot space (which I'm not)
e) Behind Seats - a good sounding option, but will sacrifice putting the seats back all the way. Fibreglass box will take a little less space than a MDF one.
f) Door Subs - like you have suggested Chitown, this is also supposed to be a good sounding option - and is what I will likely end up going for myself. BTW Chitown - what brand of subs do you have??
I don't know if it's been done before, but I may try to get my installer to build custom enclosures for these 8" Pioneer Shallow Subs that are only 2 1/2" deep.
http://www.pioneerelectronics.ca/POCEN/Products/Car+Audio+Video/Subwoofers/Shallow+Series/TS-SW841D
Here's a picture of a guy who's done full depth 8" Subs in the doors. I love the concept, but just don't want it to stick out as far as he's done. Check out the pic (and would love feedback if anybody else has tried this).
