12" SQ sub in approx .6cu sealed enclosure?

[DejaWiz 5,000+ posts]

Amp isn't purchased yet, but I was mostly likely going with a sundown 100.2 bridged which gives (I think) 450ish @ 4ohms.

Try to find a deal on the following Class D Mono Amps:

Alpine PDX-1.600

Pioneer PRS-D1100M or D1200M

Kenwood KAC-X1R

Kicker ZX750.1

Eclipse XA1000

PG Xenon X400.1 or X600.1

JL 500/1 or 500/1v2

10" is a better fit for that enclosure.

Not necessarily. Look at the list I provided a few posts above.