I cannot help noticing in this thread people mixing sensitivity with efficiency a common confusion
They are not really the same thing but have similarities
Most speakers are very inefficient about 1% or so ie conversion of electrical energy into acoustic energy.
This is often the reason people wonder why an amplifier based on sensitivity won’t actually drive a speaker adequately, because although sensitivity across a speaker remains normalised, efficiency of various components of a speaker vary considerably, due to current draw.
Sensitivity measurements has a fundamental assumption that the amplifier will always be able to provide sufficient current, for some difficult impedance speakers this may not actually hold true despite the sensitivity of its rating, a recent discussion about the Tannoy Westminster a case in point elsewhere on WBF
Conversely Devore 0/96 is both higher Sensitivity than average and a very benign load also, making it very easy to drive
Note also that electrostatic bass panels are often very efficient but the speaker may have relatively low sensitivity but very little current is required as the bass panel is of such high impedance eg CLX, which is why tube amplifiers with low current capability often drive electrostatics easily despite their sensitivity.
I provide an explanatory link
https://www.stereophile.com/content/measuring-loudspeakers-part-one-page-3