Question about Harman Kardon AVR 510 Receiver

3 Answers

Our Harmon Kardon AVR 510 has had a low hum since we first set it up 4 years ago. We suffered with it until recently, when the overall sound seemed to be degrading. My wife (the family techie) replaced all the wiring, tested all the speakers, and confirmed that it was correctly wired. The speakers now work again, but the hum is still there. Is there anything we can do about it?

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  • rdowner Dec 13, 2009

    If there's an HK power supply problem (with HK replacements likely to be the same) is there an after-market replacement that's not HK? Where could we get one? Is there a filter or regulator that can be put between the HK and speakers to regulate the voltage? Where get?

  • rdowner Dec 13, 2009

    It had a hum the first time we turned it on, although it's grown in intensity over the years.

  • rdowner Dec 13, 2009

    Sorry, I didn't understand your question when I answered before. We got it new.

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  • Harman Kardon Master
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The hum (60 Hz) is probably induced in the speakers wires by the power wires in your house - try shielding them with tin foil.

Posted on Dec 13, 2009

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  • Master
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Sounds like you have a bad capacitor in the power supply section of the amp. was that making a humming sound from brand new or was it used when you got it ?

Posted on Dec 13, 2009

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  • Master
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I have seen these have this problem alot. it is due to a power desing in the power supply and the replacement usally have the same issue. sometimes there fine and sometimes they just stink. hit or miss with this unit. to bad because it looks so nice. but other than looks it really lacks inside. hth

please ask any more question you have.

Posted on Dec 13, 2009

  • michael schultz
    michael schultz Dec 13, 2009

    no after market ones. but not all hk do this so a replacement is less likely to do this but there is a chance. this is what i was trying to get across. hth

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