In my SE-R I have 1 12" Infinity Kappa PERFECT 12.1 sub mated with a Xtant x604 amp (also drives Diamond HEX Components), and I am pretty happy with it on the whole. However, I'm putting a system now into my 95 Impala SS and I want some more umph, but my main concern in SQ, I'm a SQ freak above...