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Mackie DL1608 ghost channel

Discussion in 'Live Sound [BG]' started by NickFromNY, Jul 14, 2013.

  1. Jul 14, 2013 #1
    NickFromNY

    NickFromNY

    Nov 2, 2010
    Long Island, NY
    I have a Mackie DL1608 with preset shows set up for the different configurations of the band. Sometimes we mic drum (kick, snare and overhead). I have the drum mic set up in all preset shows whether we use then or not. Last few show we have not mic'd drums but I am getting a level signal in the drum overhead channel. Input has nothing plugged in to it and input gain is all the way down. The signal pulses with the music, so it is not just random noise. Any ideas what this could be?
     
  2. Jul 14, 2013 #2
    Zooberwerx

    Zooberwerx Gold Supporting Member

    Dec 21, 2002
    Virginia Beach, VA
    Haven't read the whole manual...yet...but, in the meantime, try this: with the whole schmear running (live band, canned track, whatever), put your headphones on, solo the ghost channel, and listen to and identify whatever the heck is coming through the 'phones. Feel free to boost the trim to saturate the channel if necessary.

    Stupid question: does the Mackie allow you to re-assign certain functions (aux's, etc.) to an empty mic channel internally or does everything require cabling?

    BTW, if you're wearing the 'phones and hear "...get out!...", heed the warning and bolt. You are not obligated to share this with your bandmates.

    Riis
     
  3. Jul 14, 2013 #3
    RoadRanger

    RoadRanger Supporting Member

    Feb 18, 2004
    NE CT
    Mine does this if the input trim is up. If you plug in something it goes away. It happens because the relatively high input impedance of the input not properly terminated with a low impedance input source picks up crosstalk from the other channels.
     
  4. Jul 14, 2013 #4
    hbarcat

    hbarcat Supporting Member

    Aug 24, 2006
    Rochelle, Illinois


    This.

    It my be possible to eliminate crosstalk by moving live channels around. Experiment.
     
  5. Jul 14, 2013 #5
    RoadRanger

    RoadRanger Supporting Member

    Feb 18, 2004
    NE CT
    The crosstalk only exists into channels that have nothing attached to them so isn't a problem.