Okay, here's what I'm talking about. Sennheiser HD600s, how are they for clamp force? All the comments I read is that they're too tight, and need stretching out, or left for a while over a pile of books. Here's mine on a new stand I've just bought.
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Okay, so they 'clamp' imwards, there's still a gap betwen the pads and the rod in the middle of my stand.
In comparison, here are the 'low clamp' Para 2s.
View attachment 504887
See that? Despite the low clamp force, their weight pulls them in so they're touching the rod in the middle.
I don't care how small anyone's head is, it's not as thin as that rod.
My working presumption here is that the nature of the headband, combined with the weight, means the clamforce isn't particularly excessive, but remains roughly the same, no matter how wide or narrow your head is. Other headphones rely on the amount of springy tension built into the solid headband, which gets greater the further you pull them apart, whereas here the clamp force is down to the weight, and lack of ridgitity in the soft headband.
Could be wrong.