The Plinius looks to be a good match with a passive from it's spec sheet. I have the Bent passive, mine is matched with my Krell Ksa-250. The Bent does not like source with very high output, most cdp's are around 2v output which with the Plinius would be plenty. I love the new case design of the Bent, mine has the old somewhat ugly case. The Bent..if it works for you is as good as it gets, IMHO.
Dave
Dave