If OP intends to add a DAC with 105D, he should use USB not coax or optical because 105D can handle native DSD only via the digital USB input on the rear of the unit(not the USB input on the front!). When I did so, I found an improvement also adding Schiit Wyrd, or iFi USB filter unit.
If you don't care about DSD, then ignore my suggestion. Cheers,
Spencer
If you don't care about DSD, then ignore my suggestion. Cheers,
Spencer