This very different curve is from a recent Sound Lab A3:
They would certainly get down to 2 ohms or so at 20k. Both spend most of their time between 3 ohms and 10 ohms over most of the range. No roller coaster profile like the Stereophile test based upon the NHT model.
OTOH, here is another variation with the Innersound Kaya which looks like a giant bell curve with huge variations that really require use of a SS amp to prevent huge FR swings. Look here.
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