05 XXX 12 405 shipped from RE1800w? SQ? No. That was just loud.
I have one of the older style that was amazing with a 400w amp on it. Really detailed bass and more than loud enough to shake my car. The new ones have more throw (not that you really need it) and cost 4x as much. They are also insanely deep and need a lot of room to fit just the driver, that's before you even worry about the box.
Because xmax means everything, right?05 XXX 12 405 shipped from RE06 XXX 12 600-700 shipped from RE(cant remember exactly)
I wouldnt say 4 times as much. Barely twice, for bout 2 times the woofer.