Qu-24 and Qu-SB audio problem

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This topic contains 4 replies, has 4 voices, and was last updated by Profile photo of Mike C Mike C 3 weeks, 6 days ago.

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  • #109747
    Profile photo of MabeVi19
    MabeVi19
    Participant

    Hello!

    I have a big problem with the audio on my mixers. It makes static noise, out of nowhere. Let me explain.

    I have those 2 mixers, QU-24 and QU-SB. The QU-24 mixer, i use it for main elements, such as the microphones for the person who speak, for actual audio speakers, and to broadcast the audio through a PC for OBS. All good so far. And the QU-SB i use it for microphones to sing, instrumentals, and portable speakers. And sometimes, I get the audio form the SB and link it to the QU-24, to stream the audio that is playing on the SB, to the Qu-24. It was all working just fine, with no issues. But suddendly, I started to make really loud static noise.

    First I thought it’s the cable, and I changed it. The problem still occurs. I’ve tried some headphones, and a speaker directly to the output port on the SB, and the problem is gone. I’ve tested my phone, to play something on the QU-24, the audio is ok. But when I connect the 2 mixers together… Static noise…

    As I change the lenght of the cable, the problem fades away. But it’s still there. I’ve tried different adapters, a straight cable… The mono and stereo jack, individually… It’s still there. I even bought a DI unit, and the problem stil persist.

    The way I linked my two mixeres, was through the headphones out port on the SB mixer. And the input ST2 on QU-24. Ain’t the best way, I know. But now, every out port does this.

    Any idea what could it be and how I can fix it? Or how I should troubleshoot it? Cause I tried almost everything, and nothing.

    #109748
    Profile photo of Giga
    Giga
    Participant

    My money is on a ground loop of sorts. Make sure you power both from the same outlet, make sure your grounds are ok. Maybe even use a ground lift between them.

    Good luck !

    Giga

    #109749
    Profile photo of Mike C
    Mike C
    Participant

    “The way I linked my two mixeres, was through the headphones out port on the SB mixer. And the input ST2 on QU-24. Ain’t the best way, I know. But now, every out port does this. ”

    That got my attention!!!!

    Do you not have any other outputs on the QUSB to connect to an input on the QU24?
    Also the headphone is a stereo tip ring sleeve output and you are connecting that to a
    mono balanced input, those two will not correctly work together?
    Now if you are taking a TRS cable that breaks out into two mono 1/4 plugs and plugging them into the ST2 inputs that would work…at least better, still not the best way.

    Using the matrix output could be an option or a mix set to post fade and brought up on all the input channels.

    You may need transformer isolation between the two mixers.

    #109754
    Profile photo of garyh
    garyh
    Participant

    Did you try ST1 and ST3 on the QU-24? Sounds like a dirty or loose connection on ST2.

    #109757
    Profile photo of Mike C
    Mike C
    Participant

    You had mentioned using a DI, what input on the Qu24 did you plug that into?
    With the DI were you still using the headphone out on the QuSB?
    Did the DI have a ground lift switch?

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