strange channel

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This topic contains 6 replies, has 4 voices, and was last updated by Profile photo of hopcazz hopcazz 2 years, 5 months ago.

Viewing 7 posts - 1 through 7 (of 7 total)
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  • #82224
    Profile photo of hopcazz
    hopcazz
    Participant

    Hi all
    my qu16 has been working all fine although it has pulled a wobly before christmas but was fine afterwards put it down to dodgy electrics. but i have booted it up today all works fine except for channel 16 it has some white noise and when plugging in a mic the mic works but i have to turn the gain down so typically on another channel that works fine to get the equivelant gain would be 27 where on channel 16 it has to be on 3 or 2 to get the equivelant. has anyone got any ideas what has happend to this channel?? or point me in the right direction

    Thank You
    Carwyn

    #82226
    Profile photo of garyh
    garyh
    Participant

    Do you have phantom power on for this channel while using a dynamic mic?

    #82233
    Profile photo of Giga
    Giga
    Participant

    Did you happen to engage the compressor on that channel with lots of makeup gain ?

    Giga

    #82236
    Profile photo of Mike C
    Mike C
    Participant

    I assume your connecting directly to the mixer and not a remote stage box.

    In addition to the compressor check to see if anything else is turned on on channel 16, if so bypass them.

    Do you have a lot of boost on the EQ, bypass it as well.

    Do you have the FX sends up on channel 16, if so turn them all down.

    What mic are you using, I take it that it works OK on other channels.

    #82240
    Profile photo of hopcazz
    hopcazz
    Participant

    Hi All
    thanks for all responses i thought id made it clear in my post but obviously not so here it goes

    Input is set to +3 on the gain on channel 16 and it equals to +22 on any of the other channels

    all the compressors and gates etc are off with no effects sends etc
    i had even re installed the previous firmware on the desk and back to the latest firmware.
    and still i had the noise

    tody i have managed to borrow a stagebox AB168 from work and connected this to the desk and here is the results from today

    so desk is still giving white noise at +3 gain from the input on the desk
    when patched to the stage box the issue disapears and when plugging in a mic the gain on the channel needs +22 as per the rest of the channels

    i have been using an sm58 for testing pourposes

    so by my calculation there is an issue with the input gain on the input of the desk local to the desk and not anywhere else

    does everyone agree with me on this

    #82241
    Profile photo of Mike C
    Mike C
    Participant

    I’m going to say that with the results of the stage box test the pre-amp is bad on ch.16 in the board.

    Just thought of another question, when using the boards internal mic inputs does the channel metering and PFL metering show that same level difference between channels or were you going just by the main output meters for your reference?

    #82242
    Profile photo of hopcazz
    hopcazz
    Participant

    input ref and output ref you can see on the input ref of some noise when theres nothing plugged in

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