Connections for NAD M51 DAC


I plan on purchasing a M51. I wish to use a audiophillieo2 on the COAxial input. I also have a Arcam DV137 which I use as a transport. I don't like using the toslink input. I could connect it via HDMI. The M51 also has an AES/EBM connection. The DV137 does not. Is the AES/EBM a balanced SPDIF input? Is it 75ohm? Are there adapters or cables that will convert the AES/EBM input to a single ended COAX input such that I might connect the DV137 via this route? Would that be better than the HDMI route? Thanks in advance for your help.
mesch
The HDMI input works great with my Oppo BDP-83, allowing me to output SACD and DVDA thru the M51. I also output my Bryston BDP-1 using the balanced cable, and finally use the USB input from my computer.

Best sound? Hi rez files from the BDP-1 and SACD and DVDA from the Oppo.
I just played some FLAC files in 24/96 on a hard drive through my BluRay player's HDMI port and it sounded incredible.....Time to buy some HD Tracks.......
I have been using a lighting to HDMi connection with my iPad (streaming Tidal CD quality). I like it but I would like to try the other connections since the optical from my Apple TV sounds terrific with apple content and Netflix. Does anyone have experience with this? Is there a way to go to the AES/EBU connector, and if not, what devices output that way in digital (is it any digital device that has XLR 'digital' output)?