I have never played the BA123s. My friend has one and LOVES it for many gigs. IT is loud for most people. For his louder gigs he has been using his Uber 115 when needed. I would use a Minimum of 2 but most likely 3 for road gigs that i do.. Any bar gig 2 are plenty, just like my MG212.. The MG212 is very loud and punchy. I prefer it over other Boutique brand 212s by a mile, ans its why i bought it . However on some of my gigs that I tour, I need to use another cab as shown below.
The Mg212 and Uber 115 are very close in overall volume IMO. They sound different but somehow compliment each other if you step away form them and hear a mix.
BUT I prefer all the same type cabs. I think LIKE CABS work better when combined than what im doing.
My Uber115 or MG212 can almost do my larger gigs on their own But just fall a but shy. The TOW give more headroom.
To get one Cab that can sound FRFW and have just a bit more SPL than either of my cabs on their own so i can have a ONE CAB rig. . That would be great.
When i am running 2.6Ω i use my MG800 of Fender TB1200.
I have been doing this so long , I sorta know what i need and what I like and what is needed to get it done. Ive said this 100 times over the years on this TB.. But From experience i have found when i do a bar gig, I play LOUDER on stage than when im playing an arena sized gig. Since I play to the room ..
The arena size and festival gigs always have great PA and I always have a great personal wedge with my own mix or IEMS.. So i can play LOWER on stage at those shows.
My crew guy would love a ONE cab .. And I would too. Its why I got the MG212.. But at times i need a bit more than 21ss and i want to use the same cab for large shows and small shows.
You are correct that 12s can beat out old style 15s.. Barefaced makes a cab that (according to them) has a 12" that has a vd of 550 cc's . That is more than my Genz Uber 115 @ about 505 cc's ... So i guess in theory that barefaced 112 can have higher SPL ( if in a property tuned box) than my already loud Uber 115.. So yes , you are correct about the new style 12's.
But like i mentioned earlier the spec on that eminence 3015LF has a vd of about 850 cc's.. That is more than Most 410s/ ( if in a properly tuned box) . in theory, that is about 1 and 1/2 of my UBER 115s cabs and more than my MG212 IRRC.. That would be in the area of a ONE cab rig.. at about 40 pounds.
The Faital is a great speaker But if you use an ARRAY type cab , the 15 would not have to extend all the way up to 4k on its own. . The ARRAY can handle all of that in a better way.
Just use a powerful MOTOR like the 3015LF to do the heavy lifting in the lows up to maybe 800 and the ARRAY would do the nice wide dispersion that they are becoming known for. ..
It would be great o have a ONCE CAB rig that can sonically SPL-wise get in the middle of what these two cabs do.
Need more than One but LESS than Both of them.
When you say 212s - is that 2 BA12-3's, One MG212 or something else? I don't think 1-15 will be noticeably louder than 1-12 (by noticeably I mean 3 db or more...)
Are you using the amp to light the room up or just for stage volume? Maybe more cabs would be better...? (well more cabs are alway better but you know what I mean)