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Mic self noise issue

Discussion in 'Recording' started by congalocke, Mar 6, 2003.

  1. congalocke

    congalocke Guest


    I am extremely new to this and would love some chiming in.

    I am planning on recording a choir/ensemble. There are 45 people in it and I was going to use 2 mics in ORTF configuration, right behind the director, 12' high. Then do an MS configuration somewhere behind the ORTF setup.

    I am reading on here about self noise and Earthworks mics and am wondering. How noticeable is the noise going to be if I use my Earthworks SR71's to record a choir?

    I will be running them through a Sytek pre.

    I have just purchased these mics for this purpose and may be finding out the hard way on thinking of self noise levels.

    My SM81's have a self noise of 16db A-weighted.
    Earthworks SR71's have a self noise of 22db A-weighted.

    Pleas "Weigh in" and let me know what your instincts/experience might be.

  2. Alécio Costa - Brazil

    Alécio Costa - Brazil Distinguished Member

    Mar 19, 2002
    I have done similar stuff like choir + camerata orchestra and horn bands and At4050´s have just done fine. Sorry, I don´t have experience with the models you listed.
  3. Stephen Paul

    Stephen Paul Active Member

    Dec 11, 2000
    Self-noise isn't your problem.

    Sensitivity in mv/Pa is.

    You're not using large diaphragm mikes in an app where you need max sensitivity.

    Either increase the number of mikes used for pickup and forget such 'classical' configs such as Decca tree and all that, and use enough, or use higher sensitivity large diaphragm mikes.

    Seems to me you're getting too hung up on numbers.

    And the wrong ones at that.

    Self-noise is only useful for certain things. Afetr that sensitivity is what you need. i.e. more V out / Pa in.
  4. congalocke

    congalocke Guest


    Thank you for your helpful direction...I have "matched" C1's and B3's, would you recommend that I use a pair of those for the up close mic's...in the appropriate large diaphragm configuration, rather than the SR71's?

    Thanks again!
  5. Mike Simmons

    Mike Simmons Active Member

    Nov 5, 2001
    Home Page:
    I own the 71's too and they ARE noisy. I love 'em for high spl apps like drum overheads.

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