calling all Guru;s, Ideas on audiophyle high effeiciency speakers solicited


Wanting to enter the "Tube system" realm. After extensive research I've come to realize that my current low efficiency speakers B&W 803D2 require a lot of power and may not cut the mustard using tube gear. Although I truly love the speakers I may end up swapping them out in the future to accommodate my new found rabbit hole. Tube amps in general provide only minimal power certainly not enough for my listening habits. 
Anyway what , by any standard, constitutes a high efficiency speaker? is it a rating of 80....... 90, 92,......97? just what is it. Do speaker manufacturers fudge the number on occasions? How do we know? Is a 2 way design inherently more efficient than a 3 way? Does  the amount of speakers in a cabinet affect efficiency?
Last of all what are some audiophile grade speakers? 
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You either truly love your speakers, or you don’t. Loving your speakers says you are happy with the amplification driving them, as you are listening to the combo. Are you really happy ?
Not listening to the combo yet. Soon I hope but not yet. Currently not happy with my amplification into the 803s Adcom 555II that I had to pull out of retirement after my Krell KAV decided to take a permanent vacation. Thats when the tube bug bit me. Tube amps may not be powerful enough to drive the 803s into nirvana
How did you feel when the Krell worked ? I do not feel tubes are a match with your speakers.