I had 2 12" ehqs in a 8cuft seal enclosure....home audio lol. Sounded clean for the price. I think I figured 3cuft for the 2 12's sealed for car audio.
I have a tma 12 (total mobile audio) made by jl audio, that i can do $55 shipped on! Svc 4, rms 300 wts. Can throw in a rockford rf200.2 for $60 and/or a sealed enclosure for the sub for $50! Want it custom made and/or ported and we'l talk, vitveet@hotmail.com