Here's the situation. I have my amp, pre/pro, video scaler, DVD changer, vcr and sat reciever all plugged into a Monster HTS 2000 power strip. This is plugged into its own dedicated outlet on its own circuit.
I have had this arrangement for 2 1/2 years with no problems at all.
today I turned it on and had a hum--sounded like 60 cycles.
I unplugged the amp and plugged it directly into the wall socket and unplugged everything else--still had the hum, so I doubt it was a new (although I don't know how) ground loop.
However, when I would press hard on the top of the pre/pro, the hum would go away.
So I started unplugging inputs--turns out the s/pdif output from the Sony DVD changer is the culprit. I touch the s/pdif coax cable to any input on the pre/pro and the hum starts--take it off and it goes away.
Luckily I can fix this easily by simply using an optical output. But how wierd is this to have a new hum start in an otherwise stable system which is conducted by the s/pdif? Is it functioning as an antenna somehow?
Does this mean the DVD is on the fritz? Any other ideas?
Thanks!
I have had this arrangement for 2 1/2 years with no problems at all.
today I turned it on and had a hum--sounded like 60 cycles.
I unplugged the amp and plugged it directly into the wall socket and unplugged everything else--still had the hum, so I doubt it was a new (although I don't know how) ground loop.
However, when I would press hard on the top of the pre/pro, the hum would go away.
So I started unplugging inputs--turns out the s/pdif output from the Sony DVD changer is the culprit. I touch the s/pdif coax cable to any input on the pre/pro and the hum starts--take it off and it goes away.
Luckily I can fix this easily by simply using an optical output. But how wierd is this to have a new hum start in an otherwise stable system which is conducted by the s/pdif? Is it functioning as an antenna somehow?
Does this mean the DVD is on the fritz? Any other ideas?
Thanks!
