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Amplifier "buzzing" help please?

Discussion in 'Hi-Fi Stereo Systems & Separates' started by witters, Sep 15, 2003.

  1. witters

    witters
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    I have a Musical Fidelity A3.2 amp which is used as the front channels in a suround setup in conjuction with a Denon AVR2802.

    The problem is that when I select Aux2 on the MF, which is the processor loop, I get a buzzing through the front L & R speakers.

    Anybody know what could be causing this please?

    The amp and receiver are connected with Van Den Hul interconnects, and I use QED SA Bi-wire for the speakers.

    Any help much appreciated.
     
  2. alexs2

    alexs2
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    Sounds like an earth loop problem....what source do you have connected via Aux2,and is it earthed via the same route as the amp...if not,that may be the origin of your problem.
     
  3. witters

    witters
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    The front pre-outs from the Denon are routed through Aux2
     
  4. alexs2

    alexs2
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    Ok....sounds very much like an earthing problem,and you will have to experiment with earthing the components via the same route etc until you get rid of it....I had a persistent earth problem recently which eventually came down to a faulty switch-mode power supply...took ages to find that!
     
  5. Mylo

    Mylo
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    I have similar prob with my marantz sr4200 and arcam a7r. The arcam is earthed but the marantz is not. The buzzing only starts when I plug in the dvd component vid or scart? Any ideas Alexs2?
     
  6. alexs2

    alexs2
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    Does the marantz have an earth connection...some AV amps,Denons included have 3 pin plugs but only live and neutral connected via those 2-pin to 3-pin adapter plugs.
    It really is often just down to experimenting and finding out where the problem is...also ensure that low level leads don't run beside mains leads.
     
  7. Mylo

    Mylo
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    The IEC socket is only 2 pin on the Marantz. Can I just ground the chassis?:confused:
     
  8. alexs2

    alexs2
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    Thought it might be.....you may have a chassis earth terminal on the Marantz...if so,give it a try,otherwise you may be left with lifting the earth on other equipment...not always recommended,but it may get rid of the problem...my Krells have shielded mains cables,but had the earth connection removed.
     
  9. Mylo

    Mylo
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    I will try earth linking the two chassis first before going inside.
    Cheers for the help Alexs2.:)
     
  10. alexs2

    alexs2
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    A pleasure...definitely dont open the amp until the warranty has expired!
    In terms of dealing with an earth loop,there shouldn't be any need to.
     
  11. Mylo

    Mylo
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    YIPPPPPEEEEEEEEEEEE !

    Earth fitted between marantz chassis and arcam and the buzzing has gone.

    :smashin:

    Cheers, Alexs2
     
  12. alexs2

    alexs2
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    As before,my pleasure,and thank you also....glad it worked.
     
  13. witters

    witters
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    I ran a cable from the ground on the MF to the ground on the Denon. Hey Preto - buzzing gone!

    Thanks for the advice.
     

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