I haven't read any if the other replies so this may be way out if context in the current discussion of the thread but I will say the following:
I run a single 8.
I have a 98 escort wagon.
Single DD1508 bought off a member on here
Aero ported 1.5cuft box iirc, I could find out for sure if you really wanted to know. Built it based upon multiple dicussions with Ray and a few other people vastly knowledgeable and experienced.
RF Prime 500.1 bought off here from teejay
Pioneer HU bought from a member on here
Stock batt stock alt
For me, it sounds great, gets the lows so hard, and just has a great overall response. Plus it doesent take up much space so I still have room when I travel.
My "dream" system which is what I will do in my next car, which will be either a Mazda speed 3or6 wagon/hatch or a suburu wagon/hatch
Is like that one pretty good guy on here that did a single 12" hertz sub fiberglassed in the rear left compartment of a red suburu forester.exceot I would stick with an eight.
But really, a quality eight (the sa8v2 being one if them) in a well designed box, can have GREAT output