Qu-Pac drops all outputs

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This topic contains 10 replies, has 6 voices, and was last updated by Profile photo of Robert Robert 4 years, 6 months ago.

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  • #58241
    Profile photo of Robert
    Robert
    Participant

    Tonight, during a show, I lost main L & R and all aux mixes. I still had active metering on everything, even mains, just no audio. One minute we’re playing, then silence. Had to turn off the Qu-Pac for a minute, then everything came back. Any ideas on this or has this happened to anyone else?

    #58242
    Profile photo of Art
    Art
    Participant

    Are you running the outputs directly out of the Qu-Pac or are you using an extender such as an AB168 or AR2412 connected to your outputs?

    #58255
    Profile photo of Robert
    Robert
    Participant

    I’m not using any extenders, just powered monitors (EV ZXA1’s) and powered mains (QSC K10’s). I did another show today (different venue) without issue. I’m hoping it was a power glitch, but was curious if this kind of dropout has occurred to others. Maybe I should look into better power line conditioning.

    #58259
    Profile photo of Scott
    Scott
    Participant

    I’m hoping it was a power glitch

    Do you run a UPS (battery backup) on your Qu-Pac? I make it a habit to run one on any digital mixing console that I use, and I have had far fewer problems with them, than without.

    #58278
    Profile photo of Robert
    Robert
    Participant

    I have not been using a UPS on my Qu-Pac, but that is about to change. Any recommendations?

    #58279
    Profile photo of Dick Rees
    Dick Rees
    Participant

    The only device that will give you the protection needed is a double conversion in-line unit. This type not only provides power in case of loss or disconnect but is always running through the battery and inverter such that the voltage is absolutely constant.

    It is the constant voltage you seek. Everything else is gravy.

    Such units are expensive new but are readily available used when server farms cycle their inventory. Used price is about 1/10th of new, but used requires purchase of new batteries. These can be had for under $100.00, so total cost should run less than $300.00 for a piece which cost around $1300.00 new.

    You still have to deal with the weight, though.

    #58280
    Profile photo of dpdan
    dpdan
    Participant

    mains and all monitors went dead at the same exact moment?

    That is just completely weird and scary,
    did anything else on the stage or in the facility loose power at the same time?
    By any chance was the Qu-Pac powered by the same AC circuit as the mains and monitors?

    #58281
    Profile photo of Robert
    Robert
    Participant

    No audio on mains and monitors but all of the metering was still active. Everything was powered off of one multi drop cord and everything went silent at the same time. I’ve worked this bar/pub many many times, plugging into the same outlet, without issue, but it is a bar/pub/restaurant and with that comes a lot of hvac, refrigeration, etc. Maybe I’ve just been lucky up to this point. I do have a Tripp-lite rack-mount power filter for what it’s worth, but that’s not too much IMHO. I have a public television recording coming up this Friday and I have to say I’m a little nervous.

    #58282
    Profile photo of David Haughton
    David Haughton
    Keymaster

    @robertlindsey Hi Robert, sorry to hear you had this trouble. Can you test the Qu-Pac before your next gig?
    I suggest running some audio through it and soak testing for as long as possible. Were you using phantom power on any channels during the show? If so, it might be worth loading a couple of channels with DI boxes and switching on +48v for the test.
    If it does happen again, and you still have power but no audio check the blue Power LED on the back of the mixer and make a note if it is lit or not. This is part of a circuit which indicates if the PSU is working correctly.
    In any case, if it does happen again, please raise a support ticket with our support team at http://support.allen-heath.com/
    Thanks. Harry.

    #58312
    Profile photo of Robert
    Robert
    Participant

    Thanks Harry. I’ve already had another gig on a hot Sunday afternoon. No issues except the iPhone (AirPlay connected) got a little too much sun and shut down. Scared me for about 30 seconds before I figured it out. I’ll keep an eye on the Qu-blue power light. I’m going to check the power where I had the problem with my new Extech CT70 meter at my next opportunity. http://www.extech.com/display/?id=14409

    #58361
    Profile photo of Robert
    Robert
    Participant

    Another successful show tonight. Recorded and provided live sound for our local public television WTVP with the Qu-Pac. Best sounding room ever! Studios are such fun.

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