I Haven't the time right now to read all the responses, so forgive me if this has already been addressed. The hum you describe is likely 120hz(full wave rectified 60hz line freq) picked up from the power supply. The difference in voltage drops between your two grounds,the innterconnects, and the power cords,cause this noise. If only one power ground,generally at the preamp, is used ground loops can be avoided. HOWEVER, if the interconnects come off you gots an ungrounded piece of equipment. Not good.
Ground Loop Problem - Stumped
I've got a nasty ground loop problem that I can't seem to figure out. I've done extensive research and tried just about everything but to no avail. Here is how I have everything connected. I am using the ExactPower EP15A and SP15A. All of my sources both digital and analog are plugged into the SP15A which in turn is plugged into the EP15A. My amplifier is plugged into the EP15A. The EP15A is plugged into my wall outlet.
1. I removed all the interconnects between all the components but kept the speakers connected - NO HUM.
2. Connected my preamp (Meridian G68) to my amp (EAD PowerMaster 8300) via RCA interconnects - HUM.
3. The hum is not affected by volume level.
Any ideas?
Thanks
1. I removed all the interconnects between all the components but kept the speakers connected - NO HUM.
2. Connected my preamp (Meridian G68) to my amp (EAD PowerMaster 8300) via RCA interconnects - HUM.
3. The hum is not affected by volume level.
Any ideas?
Thanks