2. home-theater
  3. 1391200601

Marantz AV7701

I am experiencing horrible humm issues with my 7701 setup.
7701 is connected via XLR to 5 mono amps. Combination of Bryston and Wyred.
The 7701 when connected creates a humm noise independently of volume. The higher the amp gain and speaker sensitivity the higher the noise. I have a suspicion there is some wrong with grounding or what have you?
All units are powered and grounded via a BELKIN Power Unit.
Any ideas? I am ready to ship the 7701 back but wanted to get your input maybe i'm missing something...
Thx
tsulzbacher

Showing 2 responses by doggiehowser

doggiehowser
672 posts
 
I'm using the 8801 with W4S and Bel Canto power amps.

I don't encounter a hum.

One of the main causes of the hum is the ground loop problem. Do you have a cable box attached to it? If you do, try disconnecting the cable box (power/HDMI/coax from cable etc) and see if the hum persists.

If it is still there, try unplugging all other inputs on the AVR to see if you can isolate the problematic source.
doggiehowser
672 posts
 
There are ground loop isolators you can buy. At least you've identified the problem. Maybe see if these isolators can fix the problem for you
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