Thanks VB, as always! 
I don’t know whats changed, as before when I tried the MiniDSP into the CA A5 amp, it had the same problems although today, no issues at all.
For the moment, everything else seems to be working so I’ll not touch anything… 
As the old Hi-Fi Bluffer’s Guide said - “Trying to remove hum is guaranteed to drive you to the edge of insanity”
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