Your Adcom preamp is a poor match with the Levinson amp. The Levinson amp will highlight the noise and grainy sound from the Adcom. Ditch the Adcom.
Does the Mark Levinson 331 suck?
I bought this amp on it's name and reputation alone and I do not like what I am hearing. I don't know if it's a system matching problem (I don't think it is) or what. I sold a Marsh a400 for this and the Marsh smokes it everyway. Maybe I'm doing something wrong. Someone please help me!