I had one and noticed the same thing with b+w matrix 805 as center channel.
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I don't have a 3805 but my 3803 and many oher Denon's that I've heard seem to be a bit thin on male voices. I don't know that I would call it "muddy", though. I don't think it's your speakers. I noticed a huge improvement using the analog connections from the player as opposed to the digital connection.
I have been having the same problem with my Sony DA4ES on center channel dialog. Muddy, indistinct, unintelligible dialog. My Legacy Sig III mains are crystal clear, however.
I even bought a new center channel speaker and speaker cable, which has helped some. But this is a pretty good center channel speaker, and it should be crystal clear as well.
I do wonder now if it is a problem with the DD/DTS decoder in the receiver.
I had trouble hearing dialog through my KEF 100C center channel with my Sherwood-Newcastle P-965 pre-pro. It seemed the dialog was drowned out by the rest of the soundtrack. I solved the problem simply by manually increasing the center channel level after the pre-pro does its auto-setup. Doesn't cost anything to try it.