I just got my Emotiva last night and got my Switchcraft 1230 adapter hooked up (thanks, manbear). For some reason, I noticed a significant channel imbalance (right channel louder than left) for quite some time. I tried several different things before I decided to reconnect the screw connections on the 1230 adapter. After a bit more listening, it seemed that the imbalance had dissipated a bit (if not completely). Is there some reason why the amp would need to run for a bit, maybe charge all the caps, in order to have a balanced left and right output? Or was my possibly weaker connection to the left channel screw on the 1230 causing a weaker signal? The latter makes no sense to me though... EDIT: who am I kidding, neither of those options make sense to me.
My cousin has an adapter for his Macintosh that he uses for his headphones too. He said he will bring it next time he comes. It seems the problem is not as obvious after the amp has been running for a while. It's still there, just not to the extent as before. I can definitely say that the emotiva seems to have better detail than the denon but the FR seems more toward the treble region than the warm sounding denon.
Not sure how to explain it, but it seems we had the same issue.