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Sound card/ mike mismatch?

Discussion in 'Recording Gear and Equipment [BG]' started by Andy Daventry, May 27, 2002.

  1. My son is trying to run a Sennheiser mike into a creative sound blaster s0und card, and it hums ike anything. Why? Any ideas? What is the proper way of wiring and XLR to a 3.5 mm mini jack?

    Much thanks..
  2. JMX

    JMX Vorsprung durch Technik

    Sep 4, 2000
    Cologne, Germany
    Probably because of a ground loop and bad signal-to-noise ratio). Mic preamps in consumer soundcards are crap, those of CL cards especially so (something like -44 dB for the new Audigy).

    Get a cheap mixer, e.g. Behringer, connect the mic to one of the mic inputs and the mixer to the line in of your soundcard.
  3. JMX,

    Thanks for the reply. what's a GOOD soundcard for recording, then?

  4. JMX

    JMX Vorsprung durch Technik

    Sep 4, 2000
    Cologne, Germany
    Hm, Any Midiman/M-Audio Delta, RME cards, the higher-range Hoontechs, etc.

    ASIO 2.0 drivers are a must. Just stay away from manufacturers that work mainly in the consumer/gamer market, a.k.a. Creative Labs.
  5. LowEndRider

    LowEndRider Guest

    Mar 4, 2002
    Before you throw out your sound card you need to know that XLR Mics are Balanced (Low inpedance) items and the sound card is Unbalanced (High impedance).
    You need to have a buffer amp/pad to convert one from the other to avoid impedance mismatch which can cause loss of signal and noise.
    Most british XLRs are wired pin 2 positive or "Hot"
    wheras everyone else seems to use pin 3.

    Most mixing desks (even small ones) which have XLR and 1/4" inputs also have a "Tape out" which is usually RCA and should work fine with your sound card with an adapter lead.

    Putting a balanced mic into unbalanced inputs is not recommended.



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