I didn't see any mention of crossover modifications, but I suppose they would need to be "adjusted" for the new drivers.
I spoke with James briefly, and about the only thing he could tell me was that those looking to have the upgrade will have to ship the speakers to Ascend, and it will not be a customer installed modification.
Ed
* Sierra-2EX's W/V2 crossover upgrade
* (2) Rythmik F12's
* Parasound Halo P6
* Audio by Van Alstine DVA-M225 Monoblock Amps
* MiniDSP 2x4HD For Sub calibration
*World's Best Cables Canare 4S11 speaker cables