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OK, I now have another LP pair, and what I wrote above still holds. One "magic" MP pair that has more substantial bass and balance, while all the others (an EP, another MP, and 2 LP) all sound very similar, very good, but not as good to me as the magic pair. (All of these now have new pads btw.)
But now I have a theory.
The magic pair I have seems to have a naturally higher clamping force than all the others. Kind of like in a resting state off your head, if you try to pull the two earcups apart where they meet, all of the others are much easier to pull apart. The magic pair requires some force to do that (I'd estimate it as 3x the amount of force). I also have a fairly new K240 Mk II, and the force for those is in between (not 2x, but maybe 1.75x, closer to all the other Sextetts than to the magic MP pair). They are completely different anyway, but those are close to brand new.
Now, if I take any other Sextett pair, and apply more pressure while I'm wearing them, bam, more low end oomph.
But when I look really close at the magic pair, I can't see anywhere that the headband has been bent (re-bent?) to apply more force. Manufacturing variation? Maybe these ones were just used a lot less over the years so they retain their shape better? But really, *all* the other pair are very similar in their clamping force, just that the magic pair applies a fair amount more force.