Hi, I am experiencing buzzing with my new Denon 2805. Basically there is a feature on the Naim pre-amplifier called 'unity gain'. Thiss is a 'pass thru' option that deisables the volume pot on the pre-amp so when you connect the front left-right channels pre outs on the denon i can use the main speakers as part of the av set up. The Denon 2805 replaces a venerable Yamaha 492 pro-logic processor that has been working well for the last seven years. When I have the denon powered up, but with nothing else plugged in other than the phono lead to the Naim pre - I get an auduable buzz thru the Naim front left and right speakers. When the Yamaha is connected - no Buzz. I have spoken to Naim about this and they say its down to either an earth loop at the av side of the kit, or an incompatibility problem with the Denon kit. I am therefore borrowing a Yamaha RXV1500 reciever tomorrow to see if this cures the issue, bearing in mind the old yamaha worked fine. I will report back my findings... andy c!