high-efficiency loudspeakers


 What is the best high-efficiancy loudspeakers? If you have it, are you  happy ?
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I have Zu Definition 4s and like them a lot. I drive them with a 300b SET. I have also heard and liked the Audio Note AN-E. There is an online commentary about high efficiency speakers: http://www.high-endaudio.com/RECENT.html#Nov

I'm surprised no one has mentioned Coincident.

Also, Spatial Audio now makes a special triode-oriented variant.

There is a lot to be said in favor of single driver speakers .
 Listening to a Symphonic Orch. on same is not one of them .