Hi Guys, got the X2 in and measured. One thing to note: It looks like the pad actually has an acoustic circuit in it. There's a hole labeled "Align Pin". It appears to allow air from in front of the driver to be routed to behind the baffle plate. Not sure what it does yet, I'll probably block the hole and remeasure to see if something hapens. At any rate, while the pads are replaceable, it would be virtually impossible to replicate this circuit, so pad rolling is not in the cards....or at least not in the cards if you want to keep this circuit intact.
Measurements show them very similar to the X1. Haven't done any comparative listening yet, but it looks like they'll sound very similar.