Attention All Audiophiles! SQ Subwoofer Choices!!!!!!!!?

Audiophiles? I think that term and this kind of car audio are incompatible, at least as far as the term "audiophile" is used in contemporary parlance. I can't speaker for anything except the Dayton T MkIII as the others don't give T/S perimeters - or if they do I didn't find any on any of the sites I looked at. Quite frankly I didn't look too hard as such "unimportant details" are usually not published by car audio manufacturers. The Dayton will work, and with that port it will be + 7dB at 60 Hz and have an F3 of 40 Hz. A closed box will give you a flatter response with the same F3.