Big Below 15k used that can play loud as heck

Ohm F5 with built in subs would do it and you could go DBA with current subs or sell to help finance. 

It is funny, when I started out in high end audio wanting loud. But the better my system the less I wanted it. I know this progression had something to do with distortion going down dramatically along the way… I am not sure if my age going up had anything to do with it. I used to keep turning it up to make it more satisfying, now I guess I do the same thing. Late 20’s ~95db… late 60’s ~ 72db.

2nd the vote for large Legacy speakers. I have a pair of Aeris and they are the first speakers that come close to providing the same feeling I used to get when I was involved with SPL car audio competition. Good luck!

It would be a shame to use the Dunlavy for shake purpose only.  I used to be on board with the big Klipsches but as I grew older I grew wiser and no longer think of them as "hard rocking" or loud speakers. They simply get too harsh at super high volumes unless you've done some crazy mods or treatment. I always felt the mids/highs kept going with the bass trying to keep up (yes with the Klipschorn too).  I've had Khorns, La Scalas, Cornwalls, Chorus, Forte, CF3 etc.. I'd say the best sounding speaker when cranking to party levels is the Chorus 2.  

But after owning the Tekton Double Impact, I find them just as loud but much more pleasing at the high volume. They don't scream at you as much and you sense more of the lower/midbass thumb/slam.  

JBL 4367??