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Low level hum harman kardon avr 1700

post #1 of 4
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I just got this amp for my new speakers and a friend is bringing over some very nicely shielded cable tomorrow. I couldn't wait to try the amp and plugged my headphones in. There is a distinct low level hum. It does not change when I change the volume level and is not present on any of the hdmi inputs.

Tl:dr
Low level hum on my harman kardon avr 1700. Is this a common problem? I do not like the hum at all.
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post #2 of 4
Probably unrelated, but I have the HK 3490, and it has a pretty noisy headphone output, too.

I think Harman Kardon probably puts most of the effort into the rest of the components.
    
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post #3 of 4
It could be a ground loop issue.
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post #4 of 4
Thread Starter 
I don't think it is a ground loop issue since it has no grounding pin on the power cord. I would have tried a ground lift adapter, but I don't think it's a ground loop. I can confirm (now that I have speaker wire) that there is no low level hum coming from the speakers. I guess it's fine since there's no hum from the speakers but it is a bit annoying if I have to use headphones for any reason...
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