SM-57 Recording Interference

Discussion in 'Microphones (live or studio)' started by rygor, Mar 2, 2012.

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  1. rygor

    rygor Guest


    I recently bought an SM-57. I have problems when recording with it; I know that it is not the microphone or lo-z cable or lo-hi z adapter because I have used it in limited equipment circumstances and it performs well.]

    When I run it into my computer through the line-in, however, I get a chorus-like digital interference effect. No other mic I have used has done this, although I have only used USB mics thus far, and mainly condensers, not dynamic cardiod mics. What could be causing this interference? I know it is not the environment, but rather some part of my computer setup.

    Here is a link to a recording, it's with my old beat-up campfire guitar but you'll be able to hear what I am describing. (small file size)



  2. vtr

    vtr Active Member

    Jan 19, 2009
    Bit of guesswork here, but it sounds like a delayed feedback loop. You may be listening to two copies (possibly the input and the output) of the sound combined (with a fair amount of latency in between).

    Also, line levels are lo Z and much higher than mic levels, the adaptor may not be of any real help.
  3. bouldersound

    bouldersound Real guitars are for old people. Well-Known Member

    Jan 23, 2010
    Boulder, Colorado
    Home Page:
    I'm going with delayed feedback loop. You're recording your input, plus the output which is slightly delayed, plus the output of that which is slightly delayed again and so on. Get a proper audio interface that's designed for what you're doing.
  4. TheJackAttack

    TheJackAttack Distinguished Member

    Mar 20, 2008
    currently Billings
    Line in is an unbalanced mini TRS jack on most computers. Even if you have a converter it isn't likely it is matching the input. A USB mic won't present this problem because it is converted to digital prior to hitting the computer.
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