One 12" sub in a 370Z is probably overkill for many, so why not two?? I had five Polk DXi 12" subs at home, and since I could get a dual sub zenclosure for the same price as a single I said what the heck and did it.
While this makes my contemporary urban sounds more tactile, it actually also brings classical alive.
This set up isn't for everyone, and some might find it juvenile or amateurish, but if I wanted something useful and adult, I'd be running around in a minivan having left my nuts at home on the mantle.