Ummm.....seems like a pretty uninformed popcorn topic to me; but, what do I know?
Does it strike anyone else as ironic that the two main iconic theater bass cabinets were a 118 and an 810? No 12's or 15's anywhere in sight.
Come to think of it, I can't even come up with THE iconic 15 cab. Probably be a 215 if it ever existed. I remember back in the early 70's in Detroit where I was back then, the big thing was to build an EV designed 215 box called the SRO and load it up with JBL K-140's. But, after googling SRO 215, I couldn't even find a SINGLE image. So, THAT can't be the iconic 215.
I did gig a Sunn 415 with a V baffle mount for about two years. With the Model T on top, it was pretty awesome. But, it never really caught on, and I eventually decided I needed a passenger seat in my Capri for dates more than that cab.
At one point, I actually built a 115 derivative of the SRO design, and loaded it with a single K-140; which I still have, even though I think I sold it twice. Still sounds pretty great for the bad penny it is.
And, don't show me your Peavey's. BW or not, those are only iconic from a garage band kind of perspective. All due respect to Peavey, who have been stellar. For who they're made for. I did gig a TKO combo at a local open mic for about 3 years. Perfect open mic backline amp, since it sounded ok, and I didn't care about it.
So, while 15's no doubt can be made to sound great, none have stayed with me, and I can't think of one I would want to gig now. Though the new Mesa SW215 does look MIGHTY impressive. No, I'd be more likely to hunt down an old 360, IF I was looking for the vintage thing.
My current armory includes a pair of 212's, a 112, and a 610; all Bergantino. The 212's are the AE212, Jim's first neodymium loaded 212. If anything, that cab is guilty of too much bass and with some instruments needs to be tamed with an HPF. An interesting point is that Jim's B|Amp profile for the AE212 is nearly indistinguishable from the non-profile sound; which says something for that cab's voicing.
No, 12's have been getting my gigs done for about the last 20 years. What was the point of this thread again? Oh, yeah, just no.