How to eliminate AC hum on mixer?
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  1. #1
    Schreiberie Meister Afterhour Ali's Avatar
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    Default How to eliminate AC hum on mixer?

    I've connected my PC to the Pioneer DJM 2000 using an unbalanced mono jack to cinch cable. The DJM is connected to active monitors via XLR.

    Sadly I've got alternation current hum on that connection and there is no switch on the DJM to disconnect the protect switch.

    So what is the easiest way to get rid of the hum besides connecting the DJM 2000 to a power cable without protect switch.
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  2. #2
    Tech Guru basspenetrator's Avatar
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    you tried a ground loop isolator? (zu deutsch entstörfilter)

    i bought one of these some time ago

    http://goo.gl/CVlUX
    Setup: TP 2, VCI-400 EGE, MF3D, MF Classic, DIY-Midifighter, iPad 2, Aiaiai Tma-1 // Launchpad, Ecler Smac32, 2 CDJ900, Presonus Firebox, KRK Rokit 8 //
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  3. #3
    Schreiberie Meister Afterhour Ali's Avatar
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    No, I guess I'll order one.

    Are there other ways to tackle this? (besides using digital or balanced outputs which I can't use because I don't want to have the EIE Pro running all the time just to listen to some music).
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  4. #4
    Tech Guru basspenetrator's Avatar
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    Quote Originally Posted by HedgeHog View Post
    No, I guess I'll order one.

    Are there other ways to tackle this? (besides using digital or balanced outputs which I can't use because I don't want to have the EIE Pro running all the time just to listen to some music).
    not that i know of.. different power sources for laptop, mixer & speakers might work, but then again in a normal room in a house the electrical sockets are often chained together (at least in the old building i'm living in )

    i have my firebox connected constantly to my MBP to listen to music & stuff.. gives you better sound results than any jack/rca cable..
    Setup: TP 2, VCI-400 EGE, MF3D, MF Classic, DIY-Midifighter, iPad 2, Aiaiai Tma-1 // Launchpad, Ecler Smac32, 2 CDJ900, Presonus Firebox, KRK Rokit 8 //
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  5. #5
    Tech Guru Steve Zorilow's Avatar
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    balanced to unbalanced but with the pin 1 lifted on the XLR side could work. It's a case by case thing. Digital may not solve the Ground loop issue.

    I'm not going to suggest AC ground lifting even if
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  6. #6
    Schreiberie Meister Afterhour Ali's Avatar
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    i have my firebox connected constantly to my MBP to listen to music & stuff.. gives you better sound results than any jack/rca cable.
    Its one of my quirks. NI TA6 for DJing, Akai EIE Pro for production and recording, built-in for regular listening.

    What are the downsides of AC ground lifting?
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  7. #7
    Tech Guru Steve Zorilow's Avatar
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    potential risk of shock hazard depending how and where it's done & how the internal PSU are designed. Illegal in many country, but everyone do/did it in their life.

    Recommended: Passive DI, isolation transformer, lifted Balanced connections.
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  8. #8
    Tech Mentor Audeo's Avatar
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    The problem I have with the DJM800 is that the ground is via the XLR output, not the AC cable. Causes humming and little electric shocks when touching the chassis. The DJM2000 is very likely the same

    Try a dual DI box.
    Midi Fighter|Kontrol X1|A4DJ|HDJ2000|MBP 13" 2,53Ghz 60GB SSD/500GB HDD

  9. #9
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    Get a humx. It works like a charm.

    http://www.musiciansfriend.com/ampli...m-exterminator

  10. #10
    Tech Guru basspenetrator's Avatar
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    Quote Originally Posted by DJ Aaron View Post
    problem is: we have different outlet sockets here in europe.. a little google search didnt come up with an EU equivalent.. there probably is one
    Setup: TP 2, VCI-400 EGE, MF3D, MF Classic, DIY-Midifighter, iPad 2, Aiaiai Tma-1 // Launchpad, Ecler Smac32, 2 CDJ900, Presonus Firebox, KRK Rokit 8 //
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