Re: (Probably Stupid) Thiele-Small Specification Question
You might want to consider learning a bit more before designing/building your own enclosure if this has you tripped up. But the net volume is after sub/bracing/port displacements are subtracted. The gross volume is prior to displacements being subtracted. Every manufacturer's recommendation that I've ever seen is a net volume. And, generally, the manufacturer is recommending the smallest possible size. Most subs like much more than the recommended. And, fyi, this is not a t/s question.... I was directed to the pro designers on this site after attempting this myself when I knew nothing about the subject. They were right to do it, so I'll do the same. Hit up a pro, man.
SoundQubed 6.5 Pro's DD T2 Tweeters / Phoenix Gold Xenon 100.4
FI SP4 15 D1 w/ Tantric Sounds softies / DC 5.0K
Singer 310 6 phase 2 runs of Monster Cable 1/0 / Exide g78 AGM under hood and XS D3100 in rear
Plenty of deadener on roof, trunk, doors