This is the combination I've been using the most lately.
An Ampeg B40 cab with an Orange AD200 amp.
The Ampeg cab spent almost 10 years in the attic as a night table. It is not the most efficient cab in the world. It does not deliver tight lows.
Nothing like the Eden D210XLT cabs that I have.
But the combination of the Orange AD200 with the Eden cabs kept getting me into trouble. Every gig the rest of the band and/or soundman kept complaining about the sub lows.
So I thought; let's see what happens if I put a "not so efficient" cab under that Orange AD200.
Et voila: a perfect match! The sound is really growly and compact.
Funny enough, I use the Eden D210XLT cabs with the Ampeg V4B that was originally made for the Ampeg B40!