XLR to TRS cable and phantom power

Discussion in 'Accessories / Connections' started by Bono, Sep 9, 2013.

  1. Bono

    Bono Active Member

    Joined:
    Sep 2, 2013
    Location:
    Uk
    Hi i found a good deal on a pair of XLR female - TRS cables. I need the for my vocal and acoustic condenser mics . Some people say it doesn't matter if it is XLR or TRS they are both the same but i have read TRS jacks don't support phantom power. So should i stay away from XLR - TRS cables for my condenser mics?
     
  2. dvdhawk

    dvdhawk Well-Known Member

    Joined:
    Dec 18, 2008
    Location:
    Western Pennsylvania, USA
    Yes, that is correct, you should not use those for condenser mics. Any mixer or pre-amp worth having, would not apply Phantom Power to a TRS input due to their momentary shorting nature. (electrically speaking) They generally just provide Phantom Power to the XLR.

    A block diagram from a typical mixer:

    BlockDiagram.jpg
     
  3. Bono

    Bono Active Member

    Joined:
    Sep 2, 2013
    Location:
    Uk
    Thanks for your reply.. Im glad i didn't buy them.
     
  4. Boswell

    Boswell Moderator Well-Known Member

    Joined:
    Apr 19, 2006
    Location:
    UK
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    DVDhawk is correct - don't use XLR-TRS cables for your microphones, either condenser or dynamic. Not only is phantom power on any reputable mixer or pre-amp supplied only to the XLR connectors and not to the TRS jacks, the TRS inputs usually include an attenuator (typically 20dB) so that they can accept line-level inputs when needed.

    Even if you managed to supply phantom power to your mics from a separate in-line power supply, line inputs do not generally work well for microphone signals due to inappropriate input impedance and a rise in the noise level roughly equal to the amount of input attenuation.
     
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