2. amps-preamps
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Hegel hum?

Spent a week or two enjoying my new H400 and noticed a faint hum between the time I turn it on and before I play music. Also there when I pause after playing a while. Note that the hum is only apparent when I bring my ear a foot away from the amp. I’m quite pleased otherwise but am wondering if this is normal?

baconboy
fastfreight
855 posts
 

I would think and hope no hum is normal and desired.

erik_squires
16,383 posts
 

Is the hum mechanical? 

If so it can be related to DC in your AC.  Try turning off every other breaker in the home to try to locate it. 

ghdprentice
7,282 posts
 

If you put your ear a foot from the speakers it is common to hear a faint hiss. But not a hum. This could be a faint ground loop. This would be that the amp is on a different circuit from the rest or one piece of equipment and there is a slight potential. 

 

To test. Plug everything into a single circuit and see if it remains. 

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