How to isolate cable box to eliminate hum

Bobvin

Bobvin

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Jun 25, 2013
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I was walking around using an analyser app on my iPhone and noticed a big bump at 125hz. This was in a quiet house — except the two damn Viking fridges that are always running.

Then when I was in my new music room installing recessed ceiling lights I heard it again, in one corner of the room. So I went on a mission with the iPhone app running. Upstairs, above my music room is our main family room with the flat panel TV sitting on a canbinet/console that houses the reciever, xfinity box, etc.

Turns out the Xfinity box is the culprit, just sitting there with its hard drives turning, it emits a little white noise but also this annoying 125 hz hum that seems resonates with the cabinet.

Any ideas how to isolate this device so I don't get the hum?
 
If going for Sorbothane, you can buy 1 foot squares from McMaster Carr and cut them yourself for lots less.

You need to use a straight edge and a new utility blade to cut it. I bought a few 1/2 inch slabs and cut 2" squares for use under everything
 
Here's what I got... and that 125hz hum is gone!

31pizIuMh6L.jpg


​https://www.amazon.com/gp/product/B01KAFG8EG/ref=oh_aui_detailpage_o00_s02?ie=UTF8&psc=1
 
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