Kschiu I'm not sure I follow your question, but you are facing the same issue I faced and IMHO the 3910 was a strong performer and when I added the Levinson the music was not better, just different. Someone said that if you feed the Levinson some quality signal from say a Levinson 37 or Meridian 500 you'll hear it sing...but I'm skeptical.
Denon 3910 vs. Levinson 36
Maybe I'm nuts but would you believe that a two year old Denon 3910 sounds almost as good as a Levinson 36 fed through the RCA digital out from the same Denon? The Denon might even have more detailed treble and the Levinson seems almost too laid back. Is the technology inside the 36 (built in 99 I think) that far out of date that the new Denon would be it's equal? It certainly isn't worth the money to keep the Levinson unless hooking it to a better transport would make a big improvement. Thoughts anyone?