M-Track Potential Ground Loop

I'm having issues with the M-Audio M-Track.

Noise/hum appears When : The M-Track is plugged by USB into a MacBook Air, no other devices are connected.

This sounds like a ground loop problem, there is no other devices connected besides the M-Track, the hum is heard on both USB and Direct mode.

How do I fix this?
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  • Hello,

    Thanks for posting.

    Does this happen both with headphones and speakers?

    Do you have another computer to try? This would help isolate the issue quite a bit.

    Different power outlets or even a different room?

    Try a new USB cable?

    I'd say the most frequent cause is either a grounding issue in the computer itself, related to the USB ports, or due to where you are powering your speakers from (which is why it is good to test with headphone - no speakers connected). Often a ground loop gets created between the computer and the outlet that the speakers are connected to.
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  • Occurs When: Headphones in the Audio interface, Connected to a speaker, no out put at all, just the laptop and the USB interface. So if i record with the laptop's speakers as the out put it will still make the sound.

    It happens regardless of room.

    The laptop's power cable is not plugged in. Though it occurs when the power cable is plugged in to.

    It happens with another laptop as well, with the same setup of just laptop and interface.

    It happens regardless of USB cable.

    Sounds like this sound. https://www.youtube.com/watch?v=GbNyI...
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  • I’m frustrated !
    Got the same problem with the new M-Track 2x2M and my laptop, when power cable is plugged in.

    The hum is louder in the headphones than in monitors.

    With my former audio interface, I isolated my guitar system with a DI Box with ground lift, and it cancelled the hum.

    I tried again but the hum still occurs.
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  • Actually, the ground loop goes through the path of the monitors.
    If I either unplug the power cables or the TRS cables, I do not hear any hum in the headphones, so it seems Dylan and me are facing to the same problem.

    That's a big issue I didn't have with my previous interface !

    Fortunately the hum is almost inaudible in the monitors.
    It means that I need to electrically isolate the monitors.
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  • I'm also having problems - I have an M-track II and when it is plugged into my MacBook pro retina, there is audio hum. It seems to be a ground loop issue as when I touch the shell of the MacBook pro, the hum stops immediately, as I am providing a ground. This happens whether or not the power supply is in.

    I run MainStage 3 on the MacBook and have a guitar in input 1 of the m-track II and a microphone in input II (No phantom power is switched on) and then a mono 1/4inch jack is taken out of the m-track.

    Any help is seriously appreciated as I have a band gig coming up and don't want to turn up and find that I'm creating issues for the sound guys. I have bought a DI box, but don't honestly know if this will cancel the hum as I think it's being created between the M-track and the MacBook, and will this hum therefore be in the system before the DI box has a chance to remove any group loop?

    Here's hoping someone can offer some help!
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