I use a Nordost Silver Shadow between my Bluesound Vault 2 or Cambridge 851C to the RME. Great cable and they are still available new at a pretty decent discount. I’m very happy with it.
https://www.musicdirect.com/cables/nordost-silver-shadow-digital-cable-anordss10mr
I’ll have to check on my Vault 2 as I don’t recall ever messing with volume settings when going digital out but just figured it’s like a transport and the volume is fixed but maybe I did as it’s been awhile.
I also changed out the power cable on the Bluesound too and if you look at my system I have a picture of the cable I made from VH Audio. The PC made a nice improvement as well. Using the same type of PC on the power supply to the RME as well... again it improved things.
https://www.musicdirect.com/cables/nordost-silver-shadow-digital-cable-anordss10mr
I’ll have to check on my Vault 2 as I don’t recall ever messing with volume settings when going digital out but just figured it’s like a transport and the volume is fixed but maybe I did as it’s been awhile.
I also changed out the power cable on the Bluesound too and if you look at my system I have a picture of the cable I made from VH Audio. The PC made a nice improvement as well. Using the same type of PC on the power supply to the RME as well... again it improved things.