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Phantom power issues

Discussion in 'Recording' started by marxjohnson, Feb 4, 2015.

  1. marxjohnson

    marxjohnson Active Member

    Hi, amateur podcaster here, sorting out a new recording set-up.

    I've just purchased a Behringer Xenyx 302 USB mixer to connect my microphone to my laptop for recording. However, I didn't realise that the main mic input is permanently phantom powered (no way to switch it off). When I connect my SM58 mic to it, I get a lot of static. I'm guessing this is because the SM58 isn't designed to be used with phantom power. So, what's the best way around this?
    • Is there a similar mixer without phantom power, so I can send the mixer back and get that instead?
    • Can I somehow stop the phantom power causing noise?
    • Should I just get a cheap condenser mic to replace the SM58?
    Any thoughts appreciated.
  2. Kurt Foster

    Kurt Foster Distinguished Member

    most likely it's the cable.
  3. marxjohnson

    marxjohnson Active Member

    I've tried 2 different cables, 1 XLR and 1 1/4" jack with an XLR adaptor at the mic end, both exhibit a similar problem. No problem if I plug a guitar in though.
    I have had problems with the XLR cable before though, so I'll try replacing it in any case.
  4. Kurt Foster

    Kurt Foster Distinguished Member

    can you exchange the behr*&%er for a new one ...?
  5. marxjohnson

    marxjohnson Active Member

    Possibly, do you think it could be a fault with the mixer itself?
  6. Kurt Foster

    Kurt Foster Distinguished Member

    if it's not the cable and it's not the mic, what else is there?

    i suppose it could be something in the settings ... maybe the sample rate or buffers ...
  7. paulears

    paulears Well-Known Member

    When you say static, what do you mean? Crackling, hissing, spitting noises? No way to identify the fault by 'static'. Sm58s don't get bothered by phantom.
    You mentioned using a quarter inch cable? As in jack at the mixer end and then an XLR mic end??? If so - it isn't phantom causing the problem, because the combo connector does not have phantom on the jack input. If the jack work with a guitar, I wouldn't expect the noise - in fact, connecting the mic via a jack probably won't give enough level anyway. It's for guitar/line level, and a mic won't even tickle it. If it's a crackle, then the cable does seem the likely culprit.
  8. dvdhawk

    dvdhawk Well-Known Member

    Assuming you don't have a broken wire somewhere, a dynamic mic which does not need the phantom power (like an SM58) will not be affected by the presence of phantom power and the phantom power won't be affect by the dynamic mic. There should be no phantom power present when you connected to the ¼" input.

    In my opinion, getting a 'cheap condenser mic to replace the SM58' is paddling this leaky canoe the wrong way.

    I suppose it is possible you have a broken wire inside the SM58.
  9. marxjohnson

    marxjohnson Active Member

    Yes, exactly that.

    Ok. I also noticed that when connected with the 1/4" cable, the noise got louder if I touch the mic or the mic stand, which I thought was odd.

    I've opened up the SM58 as far as I can and the wires look intact. I'll replace the XLR cable and see how I get on.

    Thanks everyone for explaining that SM58s dont have a problem with PP, nice to know I wont need a different mic.
  10. paulears

    paulears Well-Known Member

    If touching the mic changes the noise, then a cable fault make the most sense here.
  11. marxjohnson

    marxjohnson Active Member

    New cable solved the problem. Thanks!
  12. Kurt Foster

    Kurt Foster Distinguished Member

    and there you go .......!
    kmetal likes this.
  13. DonnyThompson

    DonnyThompson Distinguished Member

    Thanks for getting back to us with an update/resolution. So often, people come here for support or advice, and don't ever provide the outcome.

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