"Here is someone who compared the two subjectively"
nice review. i wonder why the difference doesn't seem to show up in the measurements. eyeballing the charts is a little tricky, but knowing that distortion scales roughly twice as fast as spl, the 2242 looks a little cleaner, but i would have expected to see more difference in the measurements given how different they seem to have performed subjectively. both use techniquest to linearize inductance, so that leaves the much lower qe as the only thing that i can see that would explain the difference.
just thinking out loud, is it possible that distortion (or something in the frequency ressponse) has a time property that is not captured in a simple frequency sweep? qe is a damping property and damping is across time. if this were true, than it would explain how two drivers with equal measured frequency response and distortion, could sound subjective "fast" or "slow", with fast simply being the one with the lower qe.