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Help my MonsterPower HTS3500 is humming

This is so weird. I just moved my audio set-up to another room in the house. I plug my Meridian 508.24 and my Conrad-Johnson PV12 preamp into the MonsterPowerHTS3500. My Bryston 4B-ST is plugged into the wall by itself. Now, when I turn the pre-amp on a hum starts to come out of the powercenter. Also, when I turn the LIGHTS on, a different hum starts to come out of the powercenter. Now the light is on a dimmer switch, and as I turn the switch, the hum changes pitch and intensity. Can anyone tell me what is going on? Thanks.
argent

Showing 2 responses by sol322

sol322
426 posts
 
You can take the dimmer out and see if the hum goes away, then you find what your next step is.
Another possible cause might be that the new room is in a different circuit in the house and something in it is putting garbage in and the dimmer just adds up to it and can be misleading as the "only" cause. Hope this helps
sol322
426 posts
 
Argent:
Did you try disconnecting one at a time the other components from the pre to see where the problem is? This requires detaching interconnects and power cables.
Do it systematically as Liguy says seems to be a ground loop.
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