For 12-inchers, I've owned the a/d/s r12s, Alumapro MX, Eclipse aluminum 8000-series (I forgot the exact model #), IDMax, and JBL Power Series P1222 - all of them were 1 driver each in 2 separate sealed boxes, placed in the rear trunk corners of a '95 Nissan Altima. The best IMO were the MX...