The Charney Audio Maestro will fit your needs perfectly. They are a single driver full range rear loaded horn based on the tractrix theory. I know you mentioned earlier in the thread that you aren't interested in this type of speaker, but the Maestro sounds nothing like other horns you may have listened to. With a decent SET amp the Maestros are very engaging with detail that isn't ear splitting but full and with bass that is deep and articulate.
There are minimal room treatments needed since the rear loaded design couples with the room and there are 0 room nodes!
Build quality is off the charts since they are made from a C&C machine that Charney owns. Everything is made in house!
It would be worth your while to make an appointment with Charney for a listen. They are located in Somerset NJ about an hour from NY an 1.5 hours from Philadelphia off exit 9 of the NJ Turnpike.
R