4 American Bass xd 6.5 subs 4th order or T Line

I was looking at the DD 6.5 subs first, but saw these and think they might work as well but are cheaper. Pulled the specs from their site and will power them with an old Rockford 800a2, so a clean 800 rms 4ohm. Each sub will see 200 watts at 4 ohms which also works better for my amp.

impedence (ohm) 4

power (rms) 150

power (peak) 300

vc (inch) 1.5A/4

magnet (oz) 60

dcr (ohM) 3.2

L (mh) 2.288

fs (hz) 48.8

sd (msqM) 12.27

bl ™ 10.74

qms 4.334

qes 0.438

qts 0.397

n (%) 0.113

SPLo (dB) 82.6

vas (L) 4.423

Cms (mmm/N) 206.84

Mms (G) 51.5

Mmd (G) 50.7

Xmax (mm) 8

MD (mm) 105

OD (mm) 166.5

OH (mm) 122

MD (mm) 105

I was orginally thinking a 4th order at 1 cube common sealed and 1.5 ported at 50hz. I hadnt figured out port area, but want it to more musical so would be smaller. I also kicked around the idea of a T line. I dont car about metering or SPL. Looking for decent thump from 70 down in a Pathfinder Hatch. I also want to get as much low end out of the set up as possible thats why the thought of a T line.

What do you guys think?