high-efficiency loudspeakers

I have Horning Eufrodite Ellipses which have 98db efficiency.  They sound really well with my Frankenstein 300b monos and First Watt SIT-3 amp.

hocheye  Hawthorne uses a horn loaded coaxil so you did buy a horn speaker

One thing about the Heresy IIIs that's interesting and noticeable when looking at them (which I often do since they're in front of my eyeballs when listening) explains part of the musical coherence they display in spades...measured from the center of the tweeter horn to the center of the woofer is only about a foot...to the edge of the woofer much less of course...all due to the mid horn being narrow top to bottom and placed right on top of the woofer (even has a cutout in the same radius as the woofer to help in the proximity), and the tweeter horn right on top of the mid. For a 3 way that's pretty close, and the design works amazingly well with tseamless blending of the drivers...a good thing.

I am a fan of many high-efficiency systems, but, most are systems built from high efficiency drivers and custom cabinets and crossovers and not complete packages.  I like some vintage drivers and a few modern drivers that are either straight out replicas of old drivers or are modern updates of old drivers; these however, are crazy expensive (e.g., G.I.P, Cogent, Goto).  

Of the modern, complete systems, my favorite are the Charney Audio systems utilizing full range drivers in back-loaded horn configurations.  Until I heard the Charneys, I did not think that a single driver system could really be a complete speaker capable of playing all sorts of music very well.

For a fairly low-cost high efficiency system (albeit with a built-in amplifier for its bass driver), I like the Rethm Bhaava.  At a substantially higher price level, I like the Avantgarde systems that also use powered bass drivers.

For not so high efficiency speakers, I like the entire line of Audio Note speakers, The 093 family of Devores, Trenner and Friedl speakers, Classic Audio field coil driver speakers and Horning.

I know they aren't the "best", but I really enjoy my Legacy Audio Focus 20/20 speakers. I've heard better speakers, but purchasing a used set of these was the best price / performance compromise for me. I also have a pair of Klipsch klf-30 speakers and a pair of Klipsch heresy I. I've gone through and replaced the crossovers and all of the drivers in the heresy and the crossovers mids and tweets in the klf-30s with parts from Bob Crites.  They are both very listenable speakers.