How to attach 1/4 inch plug to a dual impedance microphone?

It's an old Lafayette 99-4592, said to be 250/50K ohms. The cable has red, white, black and shield.

4 Answers

  • 11 months ago

    That mic comes with a standard 1/4 inch male plug. All you need to do is experiment with the wires connecting them to the two terminals on the 1/4 inch plug while it is connected to your 1/4 inch mic input on your mixer. You will not hurt the mic doing it this way. Keep in mind that this is an old very cheap mic and do not expect it to sound that great. Even a very cheap modern XLR mic will sound way better.

  • 11 months ago

    Look up the manufacturer's instructions online ---

    but don't expect to find a Lafayette site.

    There are people who post old manuals and such,

    so almost everything is covered somehow.

    If you can't find anything useful, take it to an audio repair shop.

    A technician should be able to figure it out within a few minutes.

  • khalil
    Lv 7
    11 months ago

    maybe it had an old plug...

    i think BLACK is the common wire ..

    take it to an electronic shop .. they measure its impedances ..(white, red) ...todays the standard impedance for mics is 600 ohms so the

    250 ohms mic cannot transfer maximum power to 600 ohms input....

    about 40% .... 50k was used for tube amplifiers .. triode input ...

    Attachment image
  • Mmm J
    Lv 7
    11 months ago

    That's a dynamic mic, so very little power involved. Without the schematics, we do trial and error.

    I would get a 1/4 inch plug

    or a cable with 1/4" plugs on both ends where you can unscrew the plug to expose the cable connection to the plug

    and some thin wires with alligator clips... like

    Assuming you have something appropriate to plug into. Then it turns into a testing activity to understand which is tip and which is the other part of the connector.

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