Amp hum issue

Schwingding
Schwingding Posts: 363
edited June 2007 in Electronics
This is weird.

I moved an Onix SP3 upstairs into the bedroom from where it was running off of a dedicated circuit in the basement.

Connected to nothing other than a pair of speakers, it produces an audible hum in the speakers whenever it is powered on.

It does this with the 3 pronged plug, AND it does it still with a cheater plug that doesn't use the ground. WTF?

There are lots of other things on this circuit that might cause a hum - 2 ceiling fans with IR remotes are prime candidates. But still, it does it even with the ground disconnected/cheater plug.

Any stabs at a solution? For the record - the Jolida did not hum in the same position.
HT/music rig
Panasonic PX60U 50" plasma
Yamaha 5990 AVR
Onix SP3 tube amp
bunch of Outlaw 2200 monoblocks
DUAL SVS PB12+/2 subs :eek:
Denon 3910 DVD/SACD/DVD-A
DirecTV HR10-250 DVR
Onix Strata Mini mains
Mirage OM10 surrounds
Polk CSi5 center
Polk SC80 rear surrounds
Samsung BDP1000 blu-ray player

Bedroom rig
Jolida SJ302a tube amp
Denon 2910 universal player
Onix Ref 1 monitors
Velodyne minivee
Post edited by Schwingding on
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Comments

  • ejd
    ejd Posts: 14
    edited June 2007
    While doing reasearch for my system I found some information about "ground loop" problems in the Outlaw 200 mono block manual. Maybe this is something you can apply to your situation.
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  • Skynut
    Skynut Posts: 2,967
    edited June 2007
    It doesn't know the words.
    Skynut
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  • Schwingding
    Schwingding Posts: 363
    edited June 2007
    Thanks ejd. There is no ground loop issue present in the audio rig - the amp is the only device connected to the speakers. It hums without a CDP or anything else connected to it, or to that same receptacle.
    HT/music rig
    Panasonic PX60U 50" plasma
    Yamaha 5990 AVR
    Onix SP3 tube amp
    bunch of Outlaw 2200 monoblocks
    DUAL SVS PB12+/2 subs :eek:
    Denon 3910 DVD/SACD/DVD-A
    DirecTV HR10-250 DVR
    Onix Strata Mini mains
    Mirage OM10 surrounds
    Polk CSi5 center
    Polk SC80 rear surrounds
    Samsung BDP1000 blu-ray player

    Bedroom rig
    Jolida SJ302a tube amp
    Denon 2910 universal player
    Onix Ref 1 monitors
    Velodyne minivee
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  • Skynut
    Skynut Posts: 2,967
    edited June 2007
    Is there electrical interferance?
    I used to have a computer close to an electrical room and the monitor would act all crazy because of it.
    i moved the monitor to the other side of the desk and the problem went away.
    Skynut
    SOPA® Founder
    The system Almost there
    DVD Onkyo DV-SP802
    Sunfire Theater Grand II
    Sherbourn 7/2100
    Panamax 5510 power conditioner (for electronics)
    2 PSAudio UPC-200 power conditioners (for amps)
    Front L/R RT3000p (Bi-Wired)
    Center CS1000p (Bi-Wired) (under the television)
    Center RT2000p's (Bi-Wired) (on each side of the television)
    Sur FX1000
    SVS ultra plus 2

    www.ShadetreesMachineShop.com
    Thanks for looking
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  • F1nut
    F1nut Posts: 50,815
    edited June 2007
    There are lots of other things on this circuit that might cause a hum - 2 ceiling fans with IR remotes are prime candidates. But still, it does it even with the ground disconnected/cheater plug.

    Does it hum with the ceiling fans off?

    Either way, it's not a ground loop issue.
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  • Sherardp
    Sherardp Posts: 8,038
    edited June 2007
    By chance can you plug into some sort of power filtering conditioner and see if that makes any change.
    Shoot the jumper.....................BALLIN.............!!!!!

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  • Serendipity
    Serendipity Posts: 6,975
    edited June 2007
    Sherardp wrote: »
    By chance can you plug into some sort of power filtering conditioner and see if that makes any change.

    I'd suggest the same.
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  • Schwingding
    Schwingding Posts: 363
    edited June 2007
    That'll be my next step - a power conditioner of some sort but I have nothing at present.
    HT/music rig
    Panasonic PX60U 50" plasma
    Yamaha 5990 AVR
    Onix SP3 tube amp
    bunch of Outlaw 2200 monoblocks
    DUAL SVS PB12+/2 subs :eek:
    Denon 3910 DVD/SACD/DVD-A
    DirecTV HR10-250 DVR
    Onix Strata Mini mains
    Mirage OM10 surrounds
    Polk CSi5 center
    Polk SC80 rear surrounds
    Samsung BDP1000 blu-ray player

    Bedroom rig
    Jolida SJ302a tube amp
    Denon 2910 universal player
    Onix Ref 1 monitors
    Velodyne minivee
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  • F1nut
    F1nut Posts: 50,815
    edited June 2007
    Again, does it hum with the ceiling fans off? How about with all the lights off?
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • treitz3
    treitz3 Posts: 19,249
    edited June 2007
    If you take the fan out of the circuit, the noise will go away.
    ~ In search of accurate reproduction of music. Real sound is my reference and while perfection may not be attainable? If I chase it, I might just catch excellence. ~
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  • Schwingding
    Schwingding Posts: 363
    edited June 2007
    Yes, it does hum with the ceiling fans off, but you gotta realize that you can't really turn these fans off. They have constant juice to the IR receiver for the remote (just like your TV and other devices with remotes). I've discovered some pretty screwy wiring in my house and wouldn't be surprised if this same circuit ran all over the house.
    F1nut wrote: »
    Again, does it hum with the ceiling fans off? How about with all the lights off?
    HT/music rig
    Panasonic PX60U 50" plasma
    Yamaha 5990 AVR
    Onix SP3 tube amp
    bunch of Outlaw 2200 monoblocks
    DUAL SVS PB12+/2 subs :eek:
    Denon 3910 DVD/SACD/DVD-A
    DirecTV HR10-250 DVR
    Onix Strata Mini mains
    Mirage OM10 surrounds
    Polk CSi5 center
    Polk SC80 rear surrounds
    Samsung BDP1000 blu-ray player

    Bedroom rig
    Jolida SJ302a tube amp
    Denon 2910 universal player
    Onix Ref 1 monitors
    Velodyne minivee
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  • F1nut
    F1nut Posts: 50,815
    edited June 2007
    you gotta realize that you can't really turn these fans off. They have constant juice to the IR receiver for the remote

    There you go.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • cyberhazard
    cyberhazard Posts: 67
    edited June 2007
    I think my first step would be to plug the unit back into the original outlet in the basement using an extension cord. It's fast, it's simple and it's cheap. This will instantly revile how dirty the circuit you want to use is. Or, indicate a possible outside influence such as magnetic fields or solar flares.:D

    Also look for fluorescent or any other lighting with a ballast, as well as dimmers. These are rare for receptacle circuits, but possible.
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