Originally Posted by Ch0mp
get the porta pro 2 or the ksc-75 or ksc-35. great sound for the price.
And their drivers can fit inside the UR40, and AFAIK, the UR40s use the KSC75 drivers in a KSC35 housing, that or titanium-coated KSC35 drivers because after poking around inside my dead UR40s (died of a plug short), the drivers looked exactly like that of the KSC35/Portapro/Sportapro, however it says on the housing that they're titanium coated, and I saw a metallic shine on the drivers themselves when peeking through the driver grille on the side that faces your ears, which proves the titanium-coated part.
Of course swapping the stock drivers in UR40s out with Portapro drivers and taking the foam out of the back of the housing, opening up the mesh and exposing the driver from the backside, would make for some pretty sweet-sounding circum-aural open-air headphones, and a recabling either way would help too.