@audiotroy - Potato potatoe. Revealing of an amplifier’s current delivery is not the same as revealing of an amps musicality.
But, since a gauntlet of sorts has been thrown, I offer a link to measurements.
Regardless of how you word these speakers, "hard to drive" or "revealing" an owner will have to consider whether they want a pair of speakers that is often below 2 Ohms or not.
Personally I would hate to think any manufacturer would make a low impedance speaker just to prove they can "reveal" differences in amps. That would be crazy talk, right?