Hum coming from Left and Right channel - RCA to XLR Adapter

I have a Classe SSP-800 processor which runs through a Gryphon Diablo 300 Integrated amp for the left and right channels. The other channels run through a 5 channel Krell TAS.

Historically I would run my Home Theater through a Ayre PreAmp which had XLR Inputs for L/R Home Theater Bypass. The Gryphon only has unbalanced RCAs for its Home Theater Bypass.
For some reason I get a humm out of both the left and right channels when watching a movie--Its not loud, but still annoying. I upgraded my cables, but still have the humm.

Since I never had this with the XLRs I was thinking of trying some XLR to RCA adapters out of the processor so I didn’t have to use the unbalanced connectors on the processor. Thoughts? Do these work that well.

There is not a humm on any of the other inputs on the Diably 300 so I suspect it is the outputs out of the SSP800.

Showing 1 response by frostdotcom

if there is a hum there is a ground loop.  the transformers suggested above will fix it but it should be able to be fixed with a cable.  if you can solder you could build a cable for $10 that would test this.   I would also check if the A/C plugs for both the classe and the griffon are plugged in the same direction.   

The other option is that there is a ground differential between something connected to the classe and the griffon.  unplug all inputs and outputs from the classe including those to the tv and connect them to the griffon.  does it still buzz?   Add them back in one at a time to see what causes the buzz.