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Self noise of a an SM57?

Discussion in 'Pro Audio Equipment' started by jmm22, Dec 16, 2010.

  1. jmm22

    jmm22 Guest

    I am having difficulty finding a self noise value for the Shure SM57. Does anyone know what it is? Strangely, the Shure spec sheet makes no mention.
  2. Davedog

    Davedog Distinguished Member

    I'm not 'shure' there is any!....
  3. JohnTodd

    JohnTodd Well-Known Member

    All electronics have self-noise, even passive electronics, due to quantum perturbation and possibly magnetic hysteresis. But a quality instrument like an SM57 won't have much at all.

    Usually the hiss comes form the pre-amp?
  4. Big K

    Big K Well-Known Member

    I hold a SM57 to my ears, right now,.. There is no noise and it won't talk to me either that dumm thing...
    It is all passive... If you look, there are usually no Noise Levels stated in the specs of dynamic Mics from any manufacturer.

    You experience more or less noise with active mics and their pre-amps inside.
    But if you hear an audible noise from a mic ( using a good pre-amp) you better give it a kick.
  5. Boswell

    Boswell Moderator Distinguished Member

    Passive dynamic microphones (includes moving-coil types like the SM57 and also ribbons) have no active circuitry and so have an inherent noise level solely due to their impedance. If the impedance curve is known, the r.m.s. noise value can be calculated over a specified frequency band by applying the Johnson-Nyquist formula.
  6. andersh

    andersh Member

    Are you 'shure' the mic is a genuine Shure?
    I got a counterfeit mic recently and those are crap.

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