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I got done setting up and dialing in my 5.1 system...and once in a while...I would start to hear the subwoofer hum. Talk about annoying.


I started by checking to make sure the cables were firmly attached to the AVR and the subwoofer. Ok..better.


Few days pass...it came back. This time I switched from LFE on subwoofer to Speaker in. Woot! Few days later back again.


Darn Monster Subwoofer cable I knew 12 bucks on ebay was too good a deal. I think I have a generic one someplace ...


3 hours later (and a few choice words) found the sucker downstairs. Ok...good deal...stupid Monster ...fixed.


A week later..back again. That's it... I am calling Rythmik..I know they have good Customer support. One of the reasons I bought my sub.


As I am muttering to myself and red in the face I get the bright idea...I should at least do a google search and see if it is something I can fix.


Sure enough ...took me to a thread from this very forum... It said number one cause of Subwoofer hum was a non-grounded cable coax..


Well...my AV powerstrip did have a coax in / out just never used it. I did the test they recommended...humm with cable plugged in..no hum when I disconnect.


2 min later...no subwoofer hum for last 3 weeks.


I know that there were a few threads on this in the forums but thought I would add to them as this really saved me... Hope it helps someone else.
 

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In case anybody else is looking here for hum troubleshooting here's what I found:


Symptoms:

The driver (not amp) on my F15 hummed whenever I plugged a computer on AC power into my receiver (HDMI or analog stereo). If the laptop was not plugged into the AC adapter it did not hum. Also happened with a desktop computer.


Fixes:

a) Plug the computer in on a different circuit

or

b) Use a 3-prong to 2-prong plug adapter to plug the F15 into the outlet.
 
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