Plans for DYNAUDIO 15 W 75 / 4 Ohm Woofer in 2 way monitor system ???

[RetroSquad]

I picked up two DYNAUDIO 15W75 4 ohm woofers a while back for a very low price. I was hoping to get two more and build something like the Dynaudio Gemini. Unfortunately it seems that finding the 15W75 in 4 ohm is difficult and more expensive than I want to spend at this time.

I am hoping someone has a cabinet design, crossover schematic and tweeter recommendation that would utilize this 4 Ohm 15W75 woofer.

ALSO – The foam on the back started to fail so it was removed. Any recommendations on what to use to replace it would be appreciated.

Thanks