It depends on the use case. It seems like it's supposed to just be as loud as possible, in which case I would recommend using hornresp to design a ported enclosure with a horn in front of the cones.

The port size and tuning will mostly depend on the power used.
They have a low fs of 70Hz, which would be the lowest I'd port, but I don't believe they will handle 300W with that low a tuning. Safer bet would be 90-100Hz tuning and the front horn, to boost 150-400Hz.

The best way is to measure the Ts parameters of the speakers to get accurate results from hornresp and second would be to measure the frequency responce from the mids to see where you want the gain from the front horn to get a flatish FR, because I assume they will have a rising responce, which will couple well with the horn.

If you don't want to go through the trouble, just make a ported box or you could possibly use a ready made horn like the DS18 PRO-SDF8.

 

Alright I will look into it, thnx...

Yeah it's more for just loud as I just got done building 4x 12 subwoofer box for him.

See, I didn't even think to port the box

 

No problem.

Here you have some examples (not affiliated in any way):

Köp Lådritningar Online hos AcoustiQ

Then maybe think about how to mound some compression drivers with horns on top or in front of these.