How were the digital connections made?
The stock DCX input is 110ohm AES/EBU, part of the work done is to reconfigure this as a 75ohm S/PDIF while also wiring the input transformer directly to a dedicated jack (75 ohm BNC in my case). I agree, the digital inputs are technically a purer signal path but I am using the analog inputs as I like the tone from the tube output stage of my music player.
