You can contact Ying at YBM and see what he can do for you if you ship your unit back to him in trade for a fully balanced unit (balanced input from the DAC that is, then your choice of how you want the HP connectors ... Ying can give you both balanced and s.e. HP outs, and the balanced can be dual XLR's or 4-pin).
I will stand up for Ying -- a great builder, fantastic communicator, never late -- I was so impressed with his work for me that, when on a biz trip to San Fran, I looked him up and treated him to dinner! And let's have a shout-out for the AMB designs. As Nikongod will attest (he's heard mine), the Beta 22 with Senn 850's is jaw-dropping awesome, and the M^3 with AD2K's, while not quite at the level of the Beta 22/Senn 850 combo, is also amazing.
All built for me with custom mods by YBM. Can't go wrong with the AMB / YBM duo. And a big thanks to Bozebuttons, who several years ago steered me to Beta 22 and YBM -- I was just about to buy a different amp from another builder at the Florida Can Jam when he stopped me. I would have gotten burned (and not just for money ... the other guys's amps actually catch fire).