Help with tuning 4th order design

[Bryont]

i could use a some help with tuning for a 4th order design, for a single soundqubed HDS312.

http://i649.photobucket.com/albums/uu213/bryontsullivan420/my%204th%20order_zpsg33muyca.jpg~original

thats the design

Theil Small Parameters:

Model HDS312 Woofer Size 12"

F(s) 33.65 Hz

R(e) 7.39 Ohms

Z(max) 73.74 Ohms

Q(ms) 6.912

Q(es) 0.769

Q(ts) 0.692

V(as) 22.130 liters (0.782^ft)

L(e) 8.62 mH

n(0) 0.10 %

M(ms) 364.40 grams

C(ms) 0.06 mm/N

Sensitivity 1W/1m 82.29 1W/1m

BL 27.20

Xmax 14mm

Magnet Weight 145oz

Coil Diameter 3.0"

Coil Length 40mm

Usable Throw 28mm

RMS Power 1200W

Peak Power 2400W

Mounting Depth 7.69"

Circle Cutout 11.25"

Outer Diameter W/Gasket 12.875"

looking to try to get the most spl i can but still have at least somewhat decent sq

any help would be greatly appreciated

sorry about the photo link, for some reason i cant figure out how to post pics on here.