Seeking horn array loudspeakers with a maximum price of $17,500.00 per pair.

@kckrs FYI, the Klipsch Jubilee system operates as a vented box below 100Hz. 

''PATENTED HORN-LOADED VENTED SYSTEM The patented low frequency enclosure of the Klipsch Jubilee is designed to provide magnificent presence, by leveraging the efficiencies of both horn-loaded and vented systems. The typical vented system already increases the efficiency and sensitivity for extended low frequency performance. Horn-loading this system allows the Klipsch Jubilee to be a staggering 10 to 20 times more efficient than a conventional loudspeaker. This results in unrivaled low frequency performance, maximizing output while minimizing distortion, for dynamic and clean bass.'' See here

Mike

You are looking for something that sounds good at most volume levels.  That is one of the major strengths of horn systems.  But, it is also the strength of other types of speakers like the backloaded horn full range driver system like those from Charney Audio.  I like their Companion models.  I heard, and liked this model with a Voxativ and an AER driver (I liked the AER a little more).

AsI mentioned above, find a high efficiency speaker, horn or otherwise, that you like, and then consider getting a low-powered tube amp.  The amp is also very important to great sound at low listening levels.  Most solid state amps need to be played at a higher volume levels to sound lively.

I would love be listen to all these speakers mentioned compared to my beloved Edgarhorn Slimlines that were fully upgraded to huge mil spec oil filled caps, foil inductors and wire wound resistors as well as higher end Fostex super tweeters. I love how they sound and bet they would do quite well in this group.

I wish I could use them but just not going to work in our full time RV. 

I might end up building a few different type systems to get the best I can, by fall I will be trying Frugel-horn Joan's with Mark Audio MA-200 drivers which I am sure will be quite nice and very cheap to build. 

The Edgarhorns I heard were very good sounding; they lacked the peaky midrange sound of some horn systems.