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In Reply to: RE: 60 Hz Hum posted by layman on April 01, 2014 at 12:23:24
I am disappointed to report that unplugging the LED lamps from the circuit (shared with the Universal Player) did not cure the hum problem.
It must be a more serious and/or fundamental issue.
I am electrically challenged but if I were guessing, I would say that the problem may lie with a long interconnect defeating the filtering applied to the switch-mode power supply inside the player itself (allowing distortion to leak through) or that I have a ground loop issue that only affects components with switch-mode power supplies.
Follow Ups:
Don't know if this will help. I recently cured a hum problem involving my PC, which is connected to my system via HDMI. As I suspected, this was instantly cured by plugging the PC, which is in a neighboring room, into the same electrical circuit as my prepro using an extension cord. Whoops, the extension cord is not high end audiophile certified and reviewed. Maybe if I insert 3 feet of costly audiophile power cord into the circuit, it will bring sonic nirvana. A belated April Fool's.
Also, FWIW, hum problems can also be caused by connecting a cable box to your system. Normally, this affects all system inputs, not just cable. Special "ground traps" on the coax connection cure this. Possibly this is not an issue with FIOS or other glass fiber coming into the house.
Thanks for the advice.
BTW, I do have a cable box in the system. Its connected to the TV. The Universal player is also connected to the TV via HDMI and connected to the speaker system via analog interconnects.
Worth trying a disconnect of the cable feed. If that is the cause, go here:
I tried your suggestion to disconnect the cable feed and the hum went away. I also tried building the hum filter. It did not work however, so I will keep trying. Thanks a bunch.
Try something like this
Yes the fact the hum is only in one channel told me that it was unlikely something outside the system. Switch the interconnects and see if the hum switches channels too. We'll go from there.......
ET
Good advice, although my hum problem seemed to be unequal by channel. Sometimes speaker placement can make the hum more or less apparent in different channels. But, rearranging speakers is not the fix, of course.Unplugging or swapping inputs and swapping power connections is a good idea. Unplugging everything then reconnecting one at a time might help identify the source.
Edits: 04/03/14
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