I had the ARC Ref 5se, and loved it. That being said, right out of the box the Ref 6 sounded better, huge improvement.
I hope this helps. You may also want to read some of the reviews of the Ref 6 many of which compare it directly to the Ref 5se.
I hope this helps. You may also want to read some of the reviews of the Ref 6 many of which compare it directly to the Ref 5se.