sub meant for LOW lows

[customcaddys]

so I'm working with a Jeep GC.. debating between a larger single 15 or stuffing 2 15s

i really don't want to spend much more than 300-350 in subs.

amp will either be a bass/md 3k or the "bargain" 4500 preorder..

i Mostly play djsnt/djr stuff that often dips below 25hz, sometimes as low as 18hz. (its just what i like)

looking for subs that will happily get down/excel at doing so. before i try calling Fi, any thoughts?

[Brick20]

Soundqubed hdx3 or sundown x will get low low.