Non inverting. It's simple to change on any balanced amp though. All you have to do is swap the connections of pins two and three on one end of the XLR cables.
I went from the KSA 250 that was upgraded to 250S. I like the unlimited power and smoother over all sound of the 600. I sold mine and purchased the 350 monos and liked the 600 better. So I returned the 350's to Krell and got a 600C which I later had upgraded to 700CX. I still have it.
I didn't hear much if any difference between the C and CX there's just more power. The heat factor is about the same, it never bothered me. I found the 600 to be smoother overall in the treble and midrange with a larger soundstage but it's been a long time since I compared them.
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