A Subwoofer Question

[Brooks Ellis <brooks@fortnet.org>]

        I'm posting this here 'cuz the newsgroups are full of noise and BS.
My required Audi content? My system is installed in the '90 100Q I have. (
Although, I really want a '90 200TQ!! That would kick ass! )

        Anyhow, I have a 10" sub hooked up in the trunk. It doesn't bump,
rattle windows, etc.. It just sounds good. Great in fact! My current
dilemma, is that I'm not sure I like the way it is set up. It will work
Ported, sealed, bandpass, maybe free air.. Basically, whatever. 
        Currently, I have it in a 1.75 ft^3 box ( a bit large.. ) driven by
a 120w (bridged) amp. I have a passive crossover at ~80-100 Hz. Then, I have
the rears driven by the same amp, with about 18 ohms of resistance per
speaker, and they are crossed over about 100 or 200 Hz. ( passive, also ). 
        The sub is where the action is though. I have ports in the box, but
the ports are stuffed, so the box functions as a sealed box. I like the
sealed box sound better, it will function at a lower freq., and has tighter
bass. My question is - What will happen if I go ahead and port the box for
10, 15, or 20 Hz? How will the driver function? Will it be louder at the
higher freq's? More boomy? ( yuck ) Just plain louder, but have the same
accuracy? I think that porting it for 15 Hz sounds like a good idea, but I
do not know how it will function compared to the sealed box. Any ideas?

Brooks

PS - please cc: to me as well as the list...Grazie!!