Sooo what everyone is saying here, is that the Mjolnir is not capable of reaching it's full potential with a single ended source? My recently upgraded Bifrost won't be good enough to drive the Mjolnir to it's full potential? If this is true then my thoughts of getting a mojo have been tabled indefinitely. Good thing to, as I was just about to get my LCD's and HE500 recabled for the amp.
There's not as much difference between SE and balanced performance as you'd imagine. Mjolnir doesn't use any conversion ICs or anything like that to convert single-ended to balanced, or balanced to single-ended, for that matter. The signal goes straight through a 4-gang pot (necessary for real balanced operation) and into Mjolnir's differential input.
If you feed it single-ended, it will still output balanced to the headphones, since it's amplifying the difference between one active signal and ground. If you feed it balanced, same thing--except it's amplifying the difference between two active signals.