to shield or not to shield????

Discussion in 'Microphones (live or studio)' started by reves, Mar 25, 2005.

  1. reves

    reves Guest

    I'm a little confused about the shielding/non shield issue.. I'm receiving bad radio interference from radio station(NPR) through my powered studio monitors..Could it be my cables?? I do have some flourescent lighting in the room...Could this be part of the problem??? Thanks.....
  2. Kev

    Kev Well-Known Member

    Nov 13, 2001
    yes it can

    Powered monitors have a line level input and then add current and perhaps a little gain to the speaker drivers.

    Is this radio station getting into the speakers even when the mixing desk is not connected ?

    If you have XL inputs on both speakers and mixing desk then use a balanced shielded cable.

    If all you have is RCA's then use a sheilded RCA to RCA cable.

    A simple speaker style Fig 8 cable is not what you want here.

    hope that helps a little
  3. dpd

    dpd Active Member

    Sep 29, 2004
    this one is a tough nut to crack. I would start at the beginning of your signal chain (where the signal levels are the lowest) and try to isolate the noises there. mic cables, bad (dirty) connections, poorly-grounded, ungrounded, and/or shielded electronics, bad (intermittent) cables.

    I have a 17.5 KW FM transmitter whose antenna is ~750 feet from my studio . All our studios (including our performance/recording space) are totally enclosed with copper mesh screen. Without it, RFI gets into everything.

    Also, some equipment just won't work in high RF fields. And, the more balanced I/Os you use, the less noise you'll have.

    It's detective work - good luck!

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