They are more flexible than 10'' and have more mids than a 15'. Before the FMCs I used to play a Warwick 6x10' box. Not bad but heavy as f*ck.Why 12"?
I see what you did there, it's like a 4x15" cab. Bet it sounds monstrous.
Massive tone no doubt. The midrange of 15" sits very nice in mixes.
This is my current rig
View attachment 19531
Nice to see an Ampeg rig again! I had exactly the same combination of cabs and a SVT CL amp.