Loud humming when connecting Xone:23 to amplifier

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This topic contains 9 replies, has 4 voices, and was last updated by Profile photo of volounteer volounteer 3 weeks, 2 days ago.

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  • #94305
    Profile photo of Jeremiah M
    Jeremiah M
    Participant

    Hi,

    I just got a new Xone:23 mixer after replacing my Xone:22 of many years (the power connector would not hold). When I connected the Xone:23 from its monitor RCA output to the RCA input on my amplifier (Onkyo TX-8255), the same way as the Xone:22 was, a quite loud humming noise started coming from the speakers even with the Xone:23 powered off and the amplifier set to a different input. The RCA cable is away from most of the other cables. Setting the amplifier to the Xone:23 input made the humming noise slightly quieter.
    I’ve ordered XLR female to RCA cables so hopefully that connection won’t have the same problem. Other than that, is there anything else I can do?

    Thanks,
    Jeremiah

    #94308
    Profile photo of Mike C
    Mike C
    Participant

    Disconnect all the inputs from the mixer and see what happens.

    Make sure you are not connecting to the phono input on the receiver.

    #94310
    Profile photo of volounteer
    volounteer
    Participant

    @jeremiah M

    It is absolutely mandatory to have a good ground from a TT to the chassis of the x123.
    After that there are ways for properly connecting kit to a power source to help avoid hum.

    #94311
    Profile photo of SteffenR
    SteffenR
    Participant

    the power connector would not hold

    to repair this costs 5€ (7$)… sorry could not withstand

    I’ve ordered XLR female to RCA cables so hopefully that connection won’t have the same problem.

    the connection to the amp is not the problem I guess…it will not change

    #94384
    Profile photo of Jeremiah M
    Jeremiah M
    Participant

    to repair this costs 5€ (7$)… sorry could not withstand

    You’re right. My plan is to repair the Xone:22 and sell/give it away. I’ve had it since 2011.

    the connection to the amp is not the problem I guess…it will not change

    You were also right. The XLR cables didn’t do anything, but they are nicer than the RCA ones. It turns out that the 1/8″ ->RCA cable connected from my TV to the receiver/amp was the culprit of the humming. When I disconnected it, the noise went away. No combination of connections and eliminating ground loops would make it go away unless I unplugged that cable. I probably need a better way of getting audio from the TV.

    So for now I have the inconvenience of having to alternate between having the TV output plugged in and the Xone:23 plugged in, but at least I can happily mix.

    Thanks for the help folks.

    #94385
    Profile photo of Mike C
    Mike C
    Participant

    Ah! You didn’t mention the TV connection in your first post.
    You just have a good ole fashion ground loop between the TV and the rest of
    the system, my guess is if you connect the TV directly to the Onkyo it would
    hum as well.

    A TV can lots of points for grounding, power, cable system, satellite receiver.

    You need some transformer isolation between the TV and the mixer.
    Something like one of these….

    Rolls

    Kopul

    ART

    #94390
    Profile photo of SteffenR
    SteffenR
    Participant

    or try to connect the TV to the same power socket as the receiver and put the mixer on that as well

    #94405
    Profile photo of Jeremiah M
    Jeremiah M
    Participant

    Everything is on the same surge protector except for the TV which doesn’t have a long enough cable. I’ll try extending it and plugging it into the same connection. I don’t remember 100% but I think the problem was still happening even when the TV power was not connected.

    #94409
    Profile photo of Mike C
    Mike C
    Participant

    I don’t remember 100% but I think the problem was still happening even when the TV power was not connected.

    Even unplugged from power but still connected to other sources the TV could still cause
    hum from grounding issues.

    #94413
    Profile photo of volounteer
    volounteer
    Participant

    @JeremiahM

    you need to learn the basics of electronics and what causes hum

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