I have both modded and re-cabled my HD800s. I don't think I could listen to them stock out of the Mojo, or even out of most of the rest of the gear I have here. I don't think that is the fault of the Mojo at all, as with the damping and re-cabling they sound sufficiently different that I can enjoy listening with them out of the Mojo now.
Interesting!
This definitely makes me rush to get into the mod for the HD800s...
Not sure if I remember correctly from a previous post... the mod you applied is the Anaxilus right?
It's not any particular mod -- the mods were originally created by Jazz Casual, though he wasn't the first person to think of it. At the moment I have stick-on felt covering the metal ring and "rug liner" covering pretty much everything else except the driver. I have 3 different HD800 cables -- I compared them and there isn't much in it between them other than any of them are better to my ears than the stock cable. I'll take a photo at some point. I'm not sure they are the best compared to the various options, as sometimes I felt like the sound was
too precise. A similar, if un-related discussion came up about the amount of felt surrounding the driver in the MrSpeakers Ethers, where fully surrounding the driver would have a similar, over-precise-focus effect, though for different reasons.