What is your take on high efficient speakers vs. low efficient speakers?

Klipschorns & properly matched, flea watt tube amplification in a room designed specifically for them…vs….Apogee Scintillas with no compromise amplification in a tailor made listening environment

all source components identical

How I would love to spend a week comparing those high vs low efficiency systems!

@lg1 You’ll need almost a full month in order to evaluate the speakers. The human brain can be very tricky and deceiving in the short term. 

To my ears high efficiency speakers have an agility and realism not present in low efficiency speakers. Agree that lots of time needed to sort out the sound, listening tests are hard.

@larryi That's what I wonted to hear from you.  You're on the right track. 

Here is my take on high efficient speakers. They sound great when done right. Unfortunately, it’s not that easy to design an efficient speaker. That’s why speaker companies rather make inefficient speaker by complicating the design. Simple is better but it takes longer time to implement - that’s how I see it.