I have tried, relentlessly, for 30 years to find a high efficiency speaker I enjoy. It has been a total failure, I have tried hundreds if not thousands of pairs. Everything by Klipsch makes my ears bleed, Zu's excite my cats too much, Tannoys and most others are ridiculously expensive and leave me completely cold. When amplifiers with more than 30 watts were expensive it was worth the effort. I now use a 40 watt tube amp to drive Audio Physic speakers that are 89dB and 4 Ohms, the work effortlessly.
We should reject hard-to-drive speakers more often
Sorry I know this is a bit of a rant, but come on people!!
Too many audiophiles find speakers which are hard to drive and... stick with them!
We need to reject hard-to-drive speakers as being Hi-Fi. Too many of us want our speakers to be as demanding as we are with a glass of wine. "Oh, this speaker sounds great with any amplifier, but this one needs amps that weigh more than my car, so these speakers MUST sound better..."
Speakers which may be discerning of amplifier current delivery are not necessarily any good at all at playing actual music.
That is all.