Are you sure it isn't the Khorus with the anemic low end?
As to your question, the Ref2m2 has low output impedance
and plenty of drive to mate well with just about any amp.
Should be a wonderful combination with your X600s. You need
to check one out in your system.
If you're buying used you should also check out the ARC
LS5m2. The Ref2m2 couldn't knock it out of my system in a
week-long head-to-head. A very minimalist line-stage that
might just be the best ARC ever designed. I've had mine
almost 9 years now.
As to your question, the Ref2m2 has low output impedance
and plenty of drive to mate well with just about any amp.
Should be a wonderful combination with your X600s. You need
to check one out in your system.
If you're buying used you should also check out the ARC
LS5m2. The Ref2m2 couldn't knock it out of my system in a
week-long head-to-head. A very minimalist line-stage that
might just be the best ARC ever designed. I've had mine
almost 9 years now.