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Get that hum fixed pronto.
In my experience with owning a Rogue and spending time at a local dealer, the earlier
components had a more tubey sound. Now most sound very neutral and clean as you describe.
I think out of the box you're hearing the sonic signature of this amp. As it breaks in, it will sound smoother, more dynamic, SStage and imaging will open up. I'm familiar with the original Cronus Mag and it had lush, yet accurate sonics.
Can you compare it with the Cronus II at the store (after burnin)? BYW, the 2 units may be using different brand tubes.