Allen&Heath Qu16 Suddenly goes louder and feedback

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This topic contains 40 replies, has 15 voices, and was last updated by Profile photo of Darkmutton Darkmutton 5 years, 7 months ago.

Viewing 15 posts - 1 through 15 (of 41 total)
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  • #49478
    Profile photo of frankdubbe
    frankdubbe
    Participant

    When rehearsing yesterday my Allen&Heath Qu16, went automatic very loud and ended with a highpitched feedback

    3 mikes where connected

    The issue starded when the voice of the leadsinger triggered the sound issue ! -With an aerosmith like Yell-

    Then the 2 other mikes had the same issue!
    The volume doubled automatic

    I must admit that the room we rehearsed in was very hot !

    could it be an heating issue ?
    Help thanks

    #49488
    Profile photo of [XAP]Bob
    [XAP]Bob
    Participant

    What do you mean happened when you that “the volume doubled automatically”?

    #49490
    Profile photo of frankdubbe
    frankdubbe
    Participant

    The singer sang his song
    Suddenly the sound went very loud
    on al 3 mikes

    #49494
    Profile photo of Dick Rees
    Dick Rees
    Participant

    That’s just plain old system feedback, nothing to do with faulty equipment. You’re just trying to get more volume than the setup will allow and exceeding the amount of available headrooom or the physical setup is wrong.

    #49497
    Profile photo of frankdubbe
    frankdubbe
    Participant

    Im doing this for my living and this never happened

    We were Rehearsing for 2 hours on the same volume

    Suddenly the mikes went louder and louder till a highpitch feedback

    Then I switched it off

    Its a volume issue

    Could it be coming from overheating ?

    Thanks for The tips

    #49498
    Profile photo of GCumbee
    GCumbee
    Participant

    Just too many variables. If one mic goes hot into feedback it will sound like all have. The volume will seem to rise rapidly.

    #49502
    Profile photo of [XAP]Bob
    [XAP]Bob
    Participant

    What do you mean “went louder”?

    Did the faders go up? Did the gain swing round?

    Any gates/duckers/compressors?
    Any other FX?

    If you suspect overheating have you checked the temperature of the QU – what is the environment, is it boxed in, is it outside in death valley?

    #49504
    Profile photo of frankdubbe
    frankdubbe
    Participant

    Did the faders go up? Did the gain swing round?

    No all stayed The same

    There was a led indicator insert on ??
    and a compressor

    No external Devices where connected

    How do I check temperature ?

    Thanks for helping me

    #49505
    Profile photo of frankdubbe
    frankdubbe
    Participant

    Boxed in little hot room

    #49506
    Profile photo of GCumbee
    GCumbee
    Participant

    Boxed? Put a fan on it. It only has convection cooling.

    #49507
    Profile photo of frankdubbe
    frankdubbe
    Participant

    I mean in little room sorry

    #49508
    Profile photo of Hercules123
    Hercules123
    Participant

    You could of fed the Effects back into it self. When you pull up the Effects 1 or 2 layer up on the right, and and then pull up the top layer you should not have the returns faders up. This happens often. I think its that switch from analog to digital signal flow issue. This will not feed back right away but when it does, its very high pitched and can take off quick.

    #49509
    Profile photo of Hercules123
    Hercules123
    Participant

    You probably bump or barely touched something on the mixer. With digital it only takes a very soft touch with any setting, faders, or just any parameter and it will instantly get your attention. I’m sure many engineers have experienced this.

    #49513
    Profile photo of Dick Rees
    Dick Rees
    Participant

    Come on, guys. OP says they’re in a tiny rehearsal space and a single loud yell causes a feedback loop to start between the speakers and the 3 open vox mics. The self-reinforcing loop then takes over getting louder and louder.

    No change in any settings, no technical malfunction…just a system trimmed for flat response and operated close to the GBF horizon. Once that is exceeded with the
    “Aerosmith like yell” the inevitable ensues: increasing volume from the self-reinforcing feedback loop.

    Plain and simple “Live Sound 101”. I’ll take money from anyone who wants to lose the wager.

    #49515
    Profile photo of frankdubbe
    frankdubbe
    Participant

    Its This !
    But whats the solution it never happened before ?

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