Re: 8"SUBS?
True often times you will achieve better sound quality with a sealed box, but not always. I've heard some PHENOMENAL ported enclosures in my time.
Image Dynamics is a well known "SQ" company, so even their ported boxes give excellent sound. I just wanted a little more bump in the lower end since the subs are directly behind the seats, and after all, they are only 8" speakers.
I've had the same subs in my truck in both .3ft^3 sealed and now .5ft^3 ported and honestly, the audible difference is pretty negligible.
I mainly like ported enclosures in this case since they are more efficient than sealed. I can't make up my mind on amplifier configuration yet so I can use several different power levels (depending on which amp I'm using that week) on my subs and still maintain acceptable low end volume.