high-efficiency loudspeakers


 What is the best high-efficiancy loudspeakers? If you have it, are you  happy ?
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I have a pair of Shindo 604 Field Coils at 16ohms/101+sensitivity. They are pretty special and I don't see moving away from them. I also don't see moving them period as they're the size of a washer/dryer set.
Note that my still surprisingly great sounding Klipsch Heresy IIIs cost (from a reputable Ebay seller/dealer with factory warranty) about 1500 clams including shipping. For a beautiful sounding 99db efficient 3 way I  think they are unique little speakers that will raise the roof with my massive 12wpc single ended tube amp. Unfortunately it does require payment in actual clams, which need to be refrigerated. 

Yes, currently using Hawthorne silver Iris drivers in a open baffle, sounding very very nice now as my kt77 gold lion tubes in my amp have settled in very nice.With high efficiency speakers I recommend all tubes or tube pre and SS amp.Most of these speakers have horns or compression drivers.For me I won't buy a horn loaded speaker but you may like them .
I have Horning Eufrodite Ellipses which have 98db efficiency.  They sound really well with my Frankenstein 300b monos and First Watt SIT-3 amp.