Dynamic mics on phantom power channel

Discussion in 'Recording/Live Sound' started by Rich_S, Apr 13, 2013.

  1. Rich_S

    Rich_S Member

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    Some boards have less than one phantom power switch per channel. I can think of one from my past that let me switch phantom power in 4-channel groups.

    What happens if you need a channel that has the phantom on for a dynamic mic? Does it drive a DC current through the mic? Saturate the mic's transformer? Burn something out? Sound bad?
     
  2. Motterpaul

    Motterpaul Tone is in the Ears

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    no - it doesn't do anything in theory. I would listen for a ground hum, just in case, but normally it shouldn't matter.
     
  3. mixwiz

    mixwiz Member

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    Just did it last night at a church with a soundcraft. Doesn't hurt a thing.
     
  4. Rex Anderson

    Rex Anderson Member

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    Some theorists say it magnetizes the trnsformer. Not ideal to have it on, but if there's no option and you don't hear a problem, just do what you have to do.
     
  5. Pietro

    Pietro 2-Voice Guitar Junkie and All-Around Awesome Guy

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    I've done it with 57s and 58s with no problem whatsoever.
     
  6. bigroy

    bigroy Member

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    Same here. No problems, done it for years.
     
  7. Flogger59

    Flogger59 Member

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    Older Soundcrafts (600 and 200 series) have a quirk with the phantom power buss. If the master phantom switch is on, and there are no condensors to soak up the current, then after several hours they can go into a type of low frequency self oscillation that can take out subs. Seen it happen twice.
     
  8. mixwiz

    mixwiz Member

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    Never heard of that. It's good to know however. Now if I can only store that somewhere in my memory. Thanks much.
     
  9. Mosfed

    Mosfed The mighty mighty

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    Wow. That's helpful.

    I have never had an issue when I have been backed into sending phantom power to a dynamic mic. Not ideal obviously but I never even found it to be too noisy.
     
  10. LowWatt

    LowWatt Member

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    I do it with 57s and 58s all the time, but I've heard you should never do it with a ribbon mic.
     

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