No digital out when playing SACD's. Will work fine when playing redbook CD's. So, if you want to listen to SACD's you'll have to run it through a pre-amp.
There is no digital output when playing SACD's. This is the way they inforces copy protection on SACD's. The only output you get when playing SACD's is from the left and right anolog outputs.
If the Uther has analog inputs like a pre-amp then you could use it with SACD,s via analog outputs.