Apparently Mal agrees with you too on that. I honestly have never even tried it I just base my statement on the product information stated on the Mfgr's website and my experience with running the 770 250 ohm with the e10.
If it works great I stand corrected.
I get a very noticeable difference in a lot of ways from using my onkyo txnr509 HP-out so my e10 has kinda gone out of use. Don't know if it's the 192khz vs. the 96 or the dual burr brown dacs but I enjoy my little receiver a lot.
I think he will be more than satisfied with either version.. Thanks.
My DT880 600ohm sounds fine from the E10. Can't tell much difference from it and the NFB12, Asgard, Lyr, etc honestly. I know a lot of people would be like "PFfftrttt imposibru!!!" but I hear what I hear, so that's how I will describe it.
Specs really don't mean much I'm afraid. And Beyers are rather efficient despite their impedances.