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.
Source: Pioneer DEH-80PRS
Front stage: PHD FB6.1 Pro & Vifa XT25BG60-04 on a Kenwood XR-4S
Sub stage: 2 Tantric HD12's on an Autotek MM 4000.1d
Electrical: 310 amp (lol...) Singer Alternator, 2 Wėrker 125ah batteries in back, +/- runs in Monster Cable 1/0