[Randolph Duke]

Does Beyerdynamic sell their earcups separately?
And would it be possible to swap and clip them to a pair of Ultrasone Pro 900's?
I realize this may alter the sound somewhat- but I am looking long use comfort.

 

[Jimis 3 16]

For a long use, I'd suggest you going to some thin leather or pleater earpads, I say thin so sound signature doesn't change.. because stock pads are thin too..