I had a similar system of a ARC Ref 5, Krell Evo 403e (Also had ML 433) and Wilson Sasha W/P.
I used Transparent Ref XL, and the sound was never thin nor lean, I would suggest the Ref or Ref XL if you can swing it, and do try to get the MM2 tech models as they are substantially more open than the older models.
I used Transparent Ref XL, and the sound was never thin nor lean, I would suggest the Ref or Ref XL if you can swing it, and do try to get the MM2 tech models as they are substantially more open than the older models.