I went from JBL 4319 monitors rated at 92db efficiency, 6ohm nominal, 4.7ohm at lowest point to Atalante 3 monitors rated at 87db efficiency, 6ohm nominal, 4.4 ohm at lowest point and only have to increase volume 1- 1 1/2 db for the same results. Some reviewers are using 15 watt tube amps and getting wonderful results.
Even at the old normal listening level, I’m hearing more than with the older speakers. Just the SPL is lower. Without the cabinet and crossover, the drivers in the Atalante 3 are rated at 91db efficiency on their own. Turning the wick up to get the same scale and impact requires just a db or so to get there and it sounds more convincing in some respects but can sound too loud. Go figure.
I wished I had bookmarked a review where it was explained how efficiency is such a misunderstood measurement since no two speakers rated the same, perform the same and those that vary some will perform the same.
All the best,
Nonoise