Big Below 15k used that can play loud as heck

I'd look into something from the JBL Synthesis family.

It’s not hard to hit high SPL in HiFi, it’s the cost.

One pair of lattice OB Neo 8 planar tower I built will hit 120+ db. 200hz to 21k for over and hour. They were about 800.00 usd per 72-75" of ribbon column. They tripled in price. Very close to 1800.00 per column. Then GSR started producing a better driver for 1/4th the price and still making 300% profit. Now the 9 drivers are 450.00 per column or 900.00 per pair for drivers.
BTW after an hour at 120db Every BUG in the shop was dead. THEN we turned on the BASS and every cop in town showed up, all 3 of them. Then all 53 of US got stoned.

"And if you don’t wont be alone, everybody lets get stoned"

I bribed um’ with a couple of pole dances from the neighbor lady and cookies. They left with a smile on their face. They liked the goat, the dog not so much..
I swore on the Bible the pretty roosters were for the ladies only. The Banty Roosters with the razors attached is just for a photo shoot.

We call him Tyson, he ain’t retired.. Alabama Banty. Loves the ladies..:-)

Happy New Year.

Regards

JBL DD67000 or Magico M9's. +1 Cerwin Vega and Meyer.

For 15K, you can get the JBL speakers with 15 inch woofer and horn mids and tweets. You could also go with the Klipsch Cornwall IV and a couple of SVS SB 3000 Pro subs and still have plenty of money left over. The Klipsch would be on my short list.  I am thinking of buying the Cornwall IV in 2022 to try a different flavor in my office system. 

And +1 to go pro.  Be sure to check out JBL and Meyer's sound.

Also, consider what the goal is.  If you want a club experience you should do multiple speaker arrays instead of 2, distributed and time delayed from a central location.   That will give even out the sound quality so that at the back of the house sounds as good as at the front, without needing to increase the volume of the fronts.

That's how to do it well.

Careful with the ears too. Many of us have tinnitus. If your ears ring after a session, it’s too loud, and one day, it will not fade away.

Agreed. Pro rig for that sort of experience. I had a Vox AC30 2×12" hooked up to the preamp back in time and it was VERY loud and that's only small stuff.

Make sure you treat the room, at those volumes it will all turn to loud mush otherwise.

If you want silly loud go pro. It’s Easier! There is all kinds of LOUD clear pro equipment for you to do all the damage you want.. JBL will work. I’m SURE you could ruin your ears SOONER if you do. I wish you an enjoyable endeavor to deafness. :-)

Regards

 Cerwin Vegas do play that kind of music very well but again at loud volumes those cabinets start making the music sound hollow because of the cabinets. My Tekton DIs were the same. Sounded amazing on that kind of music but when you really light the wick they cabinets talked and it ruined the experience. 

I’m surprised those B&Ws can’t play loud enough for you in that room. The B&W does have one of the biggest criterias you need for loud volumes and tight slamming bass which is a very inert cabinet. You need a very inert cabinet if you want that hard tactile bass at loud volumes IMO. 
 

my room is roughly 25x18 and both my Focal 836w and my Pioneer S-1ex play louder than I could stand with plenty of bass and I’m currently using subs. Maybe it’s you just don’t like the sound of the B&Ws. I will say at LOUD volumes you can hear the Focal cabinets which takes something away from it. With the Pioneers you never ever hear the cabinet. They have a similar inertness to your B&Ws. 
This is with a 100w ss integrated and not even going half way up the volume dial. With my 50 watt tubes it strains but only when ridiculously loud. 
 

Klipshorns with a couple subs

Pair of LaScalas

waste of a perfectly good pair of speakers 

i would go the cerwin vega route

One of the larger Legacy Audio models would be a good choice.

Pair of LaScalas with 20 good tube watts. Forget about the dark, muddled sound of high powered Levinson junk.

PA Speaker with 15 speaker and horn. Then add a sub with 18 speaker. They will be above 100db +  efficient which are made to play loud

Want bass that will kick you in the chest?  Klipsch Cornwall IV or LaScala. No need for big watt amplifiers.  Save your money.

Klipshorns with a couple subs

CERWIN VEGA!

If the only criteria you have in a speaker is playing loud...Tekton, easy pesy

@audiotroy

think the OP says under $15k used.    says it in the heading

System you failed to mention price

Are there visual and size criteria?