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REL Stampede: mysterious hum without being connected

Discussion in 'Subwoofers' started by Reepi, Jan 21, 2005.

  1. Reepi

    Reepi
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    I just bought A REL stampede. It has a hum.

    The sound is good, but is gives also sounds which shouldn't be there: there is
    a certain HUM thats very annoying. It is not constantly there. Every minute
    4 times around 5 seconds. Sometimes one hour without hum.Earthing does not help. Another electric group does not help.Disconnecting from amplifier
    does not help. The hum is so very annoying that i'm not happy with my REL. I already tried another Stampede, exactly the same
    problem. My dealer does not know a solution.

    The noise: there is always some humming, which is not annoying, but sometimes
    as I told before the noise gets loud. Very annoying.
    The source of the hum: it's not coming from the speaker, it's coming from
    behind the metal panel at the rear. It's not coming from the wooden sides.I
    guess it's the transformer.It's with the 50 Hz frequency I think.

    What I tried without any result in changing the hum. All possiblities were
    tied without any connectien to the system. All controls (volume, hight were
    turned to zero)
    -1-earthing
    -2-turning the plug around
    -3-another room, another plug from the wall to get the electricity.
    -4- earthing with the water tubes
    -5-earthing with the gastubes.
    -6-putting the REl on the first, second, or third floor.
    -7-I even tried in another house: neighbours.
    -8-placing the REL in the middle of the room
    -9-turning off all computers in the house
    -10-turning off the halogeen lights in the house.
    -11-there is no relation with the volts coming out from the net. This is
    varing from 220 to 235!
    -12-turning the REL upside down
    -13-turning the REL on its side.
    -14-making the power cable completely free from other cables.
    -15the noise is also there without any inputcable
    -16Turning the non used input volume to zero.
    -17-looking for terrorists.

    I have a Naim amplifier. In case I connect the REL I connect it to the
    speaker-output from the Naim.

    The only measure that makes a difference is switching the REL -power off!
    But thats not a good solution I presume.

    Has anyone of you ever heard or had this same problem? Even mor curious I'm for a solution.

    Reepi
     
  2. Reepi

    Reepi
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    For interesting replyes see the excelent www.naim-audio.com site.
    I placed my question under the same title as here "mysterios Hum" under the Forum---> HI-Fi corner.

    Reepi
     
  3. avanzato

    avanzato
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    All the transformers in my equipment hum to some extent and it varies during the day, the Power amps hum in time to the washing machine for instance. I live in the countryside and the supply to the house is not that powerful or I think that clean. The lights dim when the amps are switched on or the vacuum cleaner is used.

    I've been looking into mains 'cleaners' but they are expensive to buy without knowing if they will improve matters.
     
  4. Reepi

    Reepi
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    Dear Mat,

    do the transformers also have a quick variability is humming? like I described: once in every minute?
    Is the transformer hum also audible at a distance of 4 meters?

    Reepi
     
  5. avanzato

    avanzato
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    No I don't have quick bursts of hum but the amps hum when the washing machine motor is running and then stop when it stops. The transformers don't hum that loud but in a quiet room you can hear it at 4m+. The subs however do occasionally hum quite loud, they'll be almost silent and then the hum will appear, increase for maybe a minute or so and then fade again. As the subs are in standby at the time it's not the driver making the noise so must be the transformer.
     
  6. Andy_61

    Andy_61
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    Me too!

    The trouble is that my hum is continuous, at a disruptive volume during quiet passages and only dims down (it never disappears!) when I take out the hi-level input.

    Any ideas, anyone?
     

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