Ground Loops - my tip video - Page 2
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  1. #11
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    There are already digital alternatives available. You can mix 100% digitally using a DJM 750+ sending digital output to the PA system.
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  2. #12
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    Of course there is some equipment existing featuring digital and optical ins/outs - but it's not the majority.
    The majority of DJ equipment still has no optical spdif whereas almost all consumer home audio nowadays has it.
    My point here is not about that its digital, but that the optical interface will also automatically guarantee that the connection is galvanic isolated - thus 100% hum free.

  3. #13
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    Coaxial digital is also hum free, since ground noise will not be picked up by the digital receiver.
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  4. #14
    Tech Guru Patch's Avatar
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    I must admit - I've always avoided ground loop issues by altering my set-up. But - it seems to me there are TWO ways to resolve a GL issue:

    Intervention at the POWER outlet
    Intervention in the AUDIO signal chain

    My question is - how do you know if you should intervene at the POWER source, or in the AUDIO SIGNAL CHAIN???

    Does it matter where you intervene? Are there different types of hum/buzz?

    I have tried one of the cheap car audio GL eliminators (looked exactly like the one Karlos linked to), I think it was about £4. It did absolutely nothing.
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  5. #15
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    If the device is double-insulated you can potentially intervene with a ground lift at the power source.

    There is only one type of ground loop hum - 50/60Hz. The rest is just general interference.
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  6. #16
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    If the device is double insulated it won't have an earth, IE CDJs 2 core figure of 8 cable with a plastic earth prong on the plug simply to open the live & neutral openings on a socket. New CDJs and Pio mixers (From 800 above? not seen a 750) use a 2 core IEC lead which also has a plastic earth for the previous stated reason

  7. #17
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    Not all DJMs have a 2-pin IEC, as it depends on the electrical regulations in the country. They are all double insulated though.
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  8. #18
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    Yeah I just realised when re-reading it seems like I say that and have edited it

  9. #19
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    Quote Originally Posted by Patch View Post

    I have tried one of the cheap car audio GL eliminators (looked exactly like the one Karlos linked to), I think it was about £4. It did absolutely nothing.
    Yeah the cheap ass one simply don't work. The Carpower one I have was about £5 and is useless. The Shark isolator is far bigger and was £14 and works in a bar that has horrendous Ground loop hum.

    They all "look" the same but they don't all work the same.

  10. #20
    DJTT Moderator bloke Karlos Santos's Avatar
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    Quote Originally Posted by makar1 View Post
    Not all DJMs have a 2-pin IEC, as it depends on the electrical regulations in the country. They are all double insulated though.
    I just picked up a DJM T1 and it does indeed come come with US 2pin and UK 3pin power cables.

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