Correct.
If the BGM measurements are off (I didn't know that, didn't keep up with the whole "TC saga" after that long thread full of arguements), then I may stand corrected here. The lowest points along those curves were a good 7 ohms, maybe 7.1 or 7.2, rather than the 5.5 - 6 that is common to a lot of "8ohm" speakers, but I guess that info may be off.
The TC ad said you could run 3 cabs on their amp, not on any amp, so the impedance must be on the high side, the amp has a healthy margin of safety built in, or both.
our measured impedance is just DC resistance. If you look at the impedance curve, that cab's going to present a load that's pretty typical of an 8-ohm cab
I'm still curious, what these curves are that show the RS cabinets as so highly atypical?
The BGM curves are apparently rather hit-or-hiss. Like others here on TB, I read that they had been "measured" at over 10 ohms, and believed it. Without any information indicating it, I didn't believe that was necessarily abnormal. I saw that they had made similar measurements on other cabinets.
Here's the BGM impedance curves for the TCE RS, a GK and Ampeg Pro NEO:
RS210
Ampeg
GK