A constant buzzing in the speakers is nearly always a "ground loop" problem.
The signal lines are carrying some sort of voltage differential. (almost always the power line freq or multiples of it.)
The solution is to isolate the offending item.
I just had to do my system as I bought new speakers (B&W 805s) and noticed a buzz that was unobtrusive in my former Maggie IIb.
I started by disconnecting the interconnects from th pre to the amp.
With the amp turned on the speakers had zero buzz.
So I then knew it was not the amp.
Then I reconnected the pre to the amp and disconnected most of the sources.
Turned on, still no buzz.
After doing a few more checks I finally discovered the primary problem was the cable from the digital out to the DA converter WHEN IT WAS FROM THE SCD 333ES. (from the Sony SCD777ES the same interconnect to the same input on the DA converter did not cause a buzz.
I also lifted the ground on the preamp to reduce the buzz still further.. (I maked those cords with a disconnected ground so I will always know that they are disconnected.
Also I plan on making a short cheater extension cord with reversing AC polarity in it to test the SCD 333ES for the problem I mentioned.
(My thinking is the cord is reverse hardwwired into the SCD333ES)
Anyway, this is what you gotta do.
Good luck.
Also
The signal lines are carrying some sort of voltage differential. (almost always the power line freq or multiples of it.)
The solution is to isolate the offending item.
I just had to do my system as I bought new speakers (B&W 805s) and noticed a buzz that was unobtrusive in my former Maggie IIb.
I started by disconnecting the interconnects from th pre to the amp.
With the amp turned on the speakers had zero buzz.
So I then knew it was not the amp.
Then I reconnected the pre to the amp and disconnected most of the sources.
Turned on, still no buzz.
After doing a few more checks I finally discovered the primary problem was the cable from the digital out to the DA converter WHEN IT WAS FROM THE SCD 333ES. (from the Sony SCD777ES the same interconnect to the same input on the DA converter did not cause a buzz.
I also lifted the ground on the preamp to reduce the buzz still further.. (I maked those cords with a disconnected ground so I will always know that they are disconnected.
Also I plan on making a short cheater extension cord with reversing AC polarity in it to test the SCD 333ES for the problem I mentioned.
(My thinking is the cord is reverse hardwwired into the SCD333ES)
Anyway, this is what you gotta do.
Good luck.
Also