Sundown sa-15 d4 box design help

[ambrizd528]

I just ordered one for now sundown sa-15 d4. I need help on the box, I thought it was as simple as 3-4 cuft each tuned to 34/35 hz but recently I've seen a lot of designs with people saying not enough port area. Having just built a box for skar vvx 12s and not being happy with it (my fault entirely) i was hoping to get a good design. It's going in a escalade ext subs and ports facing forward.

Power will be kicker ix1000 on each one i would like 2 separate chambers for each sub. L port or aeros will work. Nothing too fancy I'm still learning how to build better boxes.

I want width 48" total so 24" each chamber

Depth and height anywhere around 20" under or over

Both ports or aeros in center of box

Box wil have flush mount baffle for the sub but for the port I can just cut around ports if it makes it easier

Any more info needed? Thanks for any and all the help!