60zHz hum is always caused by either induction or a ground loop. If proper grounding resolves the issue, then there is no risk of introducing noise because there is no voltage differential. (See differential op-amp). An isolation transformer mitigates the problem breaking / floating one ground loop, but the system, still not properly grounded, is still susceptible to other ground-related ills.
60 Hz Noise Reduction
How do I eliminate 60Hz hum from my audio system?
HISTORY:
I recently purchased an Acurus A200 to increase the volume level of the front channel of my second system. When I connected the unit I noticed a 60Hz hum coming from both front speakers. I'm thinking the new set up has created a ground loop, or the units with no AC ground plug (2 prong AC plug) have a floating ground. The 2 prong AC units are Denon AVR3805, and Velodyne ULD15. So I would like to get some ideas of things I can do to eliminate the 60Hz hum This set up is a hodge podge of equipment left overs from the past.
OLD SET-UP (No 60Hz Noise)
Denon AVR3805 driving front, center, and surround speakers.
Denon preamp out to ULD15 controller/amp driving ULD15 sub.
NEW SET-UP (60Hz Noise)
Denon AVR3805 reciever which powers center, and surround speakers which are Monitor Audio bookshelf speakers. Denon pre-amp out to ULD15 Series II controller/amp driving Velodyne ULD15 sub. ULD RCA output to Acurus A200 amp input driving Monitor Audio GS10 for front.
Ideas Appreciated
Aaron
HISTORY:
I recently purchased an Acurus A200 to increase the volume level of the front channel of my second system. When I connected the unit I noticed a 60Hz hum coming from both front speakers. I'm thinking the new set up has created a ground loop, or the units with no AC ground plug (2 prong AC plug) have a floating ground. The 2 prong AC units are Denon AVR3805, and Velodyne ULD15. So I would like to get some ideas of things I can do to eliminate the 60Hz hum This set up is a hodge podge of equipment left overs from the past.
OLD SET-UP (No 60Hz Noise)
Denon AVR3805 driving front, center, and surround speakers.
Denon preamp out to ULD15 controller/amp driving ULD15 sub.
NEW SET-UP (60Hz Noise)
Denon AVR3805 reciever which powers center, and surround speakers which are Monitor Audio bookshelf speakers. Denon pre-amp out to ULD15 Series II controller/amp driving Velodyne ULD15 sub. ULD RCA output to Acurus A200 amp input driving Monitor Audio GS10 for front.
Ideas Appreciated
Aaron