What Horn loaded speaker/ speaker system for $10k'ish and under

Hello Sir

I personally own 26yo JBL S3100s a 2 way asymmetrical horn design with a 15 inch bass driver. They will not thunder you out the room, but give very fast bass response especially for a 15 with 94db efficiency without the horn drawbacks. The ME150HS bass driver is basically a 600 watt basket with a 2235 cone. You will not hear much talk about them as they were designed for the Asian Market even though made in America. Mine have been used with multiple amps throughout ownership, but settled on Warner Imaging ER300s a small manufacturer based in Baltimore around 2000 who knew how to build solid state with "Tube Character". If I decided to give them up I would replace with 4344Mk2

https://www.canuckaudiomart.com/details/649479281-jbl-s3100-minieverest-rare-in-northamerica/

https://audio-database.com/JBL/speaker/4344mkii-e.html

How about a pair of used Avant Garde Duos? 

I have Volti New Rivals in the bubinga tree finish.  The build quality is off the charts.  Best sounding speakers I’ve ever had as well and I’ve owned at least a dozen.

Completely in the Volti camp! With @jond ​​​​@krgottschalk on this. I am completely blown away with my Razz. Either SS or Tube they are simply effortless, have a beautiful soundstage, and the mids are stunning. You could pick up a pre-loved pair of Rivals for under 10k.
If you are in close proximity to Greg at Volti, I highly recommend taking the drive.
If you are anywhere close to NE Ohio, I’d be happy to host.

Perhaps a Horns Mummy, if the looks are acceptable.  Incredibly smooth mids and highs, strong bass from a 12" Beyma.   No need for a sub, at least not for myself.  Soundstage is incredible for this price ($3k used), both vertical and horizontal. 

Good luck on your search

https://www.usaudiomart.com/search.php?keywords=mummy