"Ticking" noise in every channel with phantom power enabled

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This topic contains 9 replies, has 6 voices, and was last updated by Profile photo of [XAP]Bob [XAP]Bob 4 years ago.

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  • #62329
    Profile photo of Anthoven
    Anthoven
    Participant

    Hi all,

    We have a QU32, and there is a very noticeable, electronic “ticking” sound present on all local inputs with phantom power enabled (or, more specifically, with a condenser microphone attached). The “ticks” are precisely regular, and can be heard through the outputs, and seen on the input stage meters. The volume of the “ticking” is proportional to the preamp gain on that channel.

    Has anyone experienced this problem before? Can anyone make any recommendations on how to solve it?

    Thanks for your help!

    #62331
    Profile photo of [XAP]Bob
    [XAP]Bob
    Participant

    Sounds bad – Do you have any stage boxes (to eliminate preamp related issues) or a phantom power injector (to eliminate that bit of circuitry)?

    Does it occur with phantom powered DI boxes?
    With and without signal?

    #62354
    Profile photo of BisManMusic
    BisManMusic
    Participant

    Install situation or multiple locations? The “precisely regular” has me thinking it’s coming from source power.

    #62358
    Profile photo of Mike C
    Mike C
    Participant

    Have you tried it with all of the inputs disconnected at the mixer?

    #62359
    Profile photo of Dick Rees
    Dick Rees
    Participant

    Yes, the regularity points toward the power. Throw a UPS on it and see if the tick goes away.

    You’ll probably want a UPS in your set-up at any rate.

    #62374
    Profile photo of xyz
    xyz
    Participant

    hmmm interesting:

    present on all local inputs with phantom power enabled

    Do you have an AR unit and is the tick also coming from there?

    #62380
    Profile photo of Anthoven
    Anthoven
    Participant

    I’ve done some further troubleshooting.

    There is clearly a problem with Phantom Power on inputs 17 through 32. When those inputs are powering a DI box, the lights on the DI actually pusle.

    Adding a UPS to the system does not affect the ticking in any way.

    I feel the desk will have to go in for a service, needing power supply repair.

    Has anyone else experienced this problem before?

    #62388
    Profile photo of [XAP]Bob
    [XAP]Bob
    Participant

    It not channels 1-16?

    Wonder if the 48v convertor is separate?

    #62391
    Profile photo of Anthoven
    Anthoven
    Participant

    Yes, channels 1 to 16 are perfectly fine!

    #62395
    Profile photo of [XAP]Bob
    [XAP]Bob
    Participant

    Sounds like there are two circuits generating the 48V, and one of them is kaput.

    Short term – don’t put phantom devices on the higher channels :p

    Otherwise looks like a warranty fix to me.

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