Klipsch K Horns (the new AK6)

At $15k, eeek!!!!! and their hard to drive, forget your 2A3's on these

Cheers George
72e4c625 a988 477a 909e 6432e918c9a3georgehifi
 just not as easy for a 2a3 flea watt tube amp.

The old K-Horns,  La-Scala ect were and that's what they had going for them even though their sound was questionable to me.
 Now they're just as hard as anything and have quite miserable measurements, lose lose on both counts for $15K.

Cheres George
I read the review and there are obvious issues like the front panel resonating and the phase distortion between drivers. I would love to triamp K horns, and correct the phase issues and frequency response with DSP control. Add subwoofers below 100 Hz and I bet they would be in serious contention for best sound ever. 

I too am a bit surprised that a high efficiency speaker like these would have such a dubious impedance curve. As to the other peculiarities, these should come as no surprise to any hobbyist that has even a elementary knowledge of this design. 
High efficiency and load are of course two different things.

Getting a good match is always critical but the speakers that will work well with the widest variety of amps are those with an easy load, like Daedulus and Fritz, not necessarily those that are high efficiency.

Efficiency only determines how loud things can get per watt.

An easy load also means "better mileage" per watt which can translate to speakers going louder better than others with difficult load yet similar efficiency specs.

High efficiency speakers often get a bad rap because they have potential to easily sound the most wrong if not driven by the right amp. But with the right amp....... Not for the faint of heart.

Had a pair of LaScalas in a huge living room powered by a custom made SE EL84 amp from Don Allen- RIP. Kicked a-- on anything from solo guitar to jazz trios to symphonies to rock. FWIW.