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249 Views 11 Replies Latest reply: Sep 4, 2012 5:37 AM by Sussyminds RSS
eccofive Just Startin'
eccofive
11 posts since
Dec 6, 2006
Currently Being Moderated

Aug 27, 2012 12:18 AM

Feedback-Issue after 2 hours of gig... anyone?

hey.

we used the m20d for 4 gigs now. everything works fine so far but there is one little problem:

after 2 hours of playing we get feedback on the main vocals. it sounds like the m20d raises the

upper frequencies of the vocals. it stops as the fbs jumps in. so it is not a big issue but i noticed that 4 times now.

when i lower the upper frequencies manually the feedbacks are gone.

maybe someone noticed that issue, too.

  • ArneLine6 Line 6 Support
    ArneLine6
    172 posts since
    Mar 14, 2012
    Currently Being Moderated
    Aug 27, 2012 8:22 AM (in response to eccofive)
    Re: Feedback-Issue after 2 hours of gig... anyone?

    I have used the M20s a lot on "hot" stages and try to understand what happens here.

    The M20d does not raise frequencies by itself. Could it be that after 2 hours someone changes the amps, output levels or

    eq's ?

    The feedback suppression filters are very narrow notches and usually not audible. Do you have lower frequency feedbacks before this happens ?

    • eccofive Just Startin'
      eccofive
      11 posts since
      Dec 6, 2006
      Currently Being Moderated
      Aug 27, 2012 9:46 AM (in response to ArneLine6)
      Re: Feedback-Issue after 2 hours of gig... anyone?

      hey.

      no one changed anything. it works perfectly so far.

      and i had no feedback-issues with lower frequencies.

      it's just a short-time-issue. it vanishes after a few minutes. :-)

      thanx

      • dboomer Line 6 Support
        dboomer
        1,997 posts since
        Oct 13, 2008
        Currently Being Moderated
        Aug 27, 2012 9:50 AM (in response to eccofive)
        Re: Feedback-Issue after 2 hours of gig... anyone?

        When you say "no one changed anything" ... did any vocal mics move their positions at any time?

        • eccofive Just Startin'
          eccofive
          11 posts since
          Dec 6, 2006
          Currently Being Moderated
          Aug 27, 2012 10:33 AM (in response to dboomer)
          Re: Feedback-Issue after 2 hours of gig... anyone?

          no, they didn't move.

          but i read somewhere that the m20d auto-corrects the volume while the gig runs.

          so, when we play more harder to the end of the gig the m20d does some corrections

          so the tone won't crack.

          we use those old-school "elvis-like" mics from sure. they are very sensitive for higher frequency-feedbacks.

          maybe it's a mix of it all...

          • dboomer Line 6 Support
            dboomer
            1,997 posts since
            Oct 13, 2008
            Currently Being Moderated
            Aug 27, 2012 3:24 PM (in response to eccofive)
            Re: Feedback-Issue after 2 hours of gig... anyone?

            The "trim tracking" doesn't change the volume ... just the gain structure and it only turns it down. Gain structure does not cause feedback but gain (level) does.

             

            There's a good chance the when you "play harder to the end of the gig" tht's what is pushing you over into feedback.  The feedback supressor will not "eliminate" feedback but it will help you manage it.  But once you get past the  threshold you will get feedback.  Basically the feedback supressor just grabs the first 12 frequencies that feedback would have occured.  So the amount of possible improvement will depend on how well your system is setup in more tradidional terms.  Feedback from the mains is not typical for most users.  Maybe repositioning your mics further back from the frontline may help.  This is somewhat limited by ceiling height.  If you have low ceilings you will not be able to get as much gain before feedback as if you have a 30 foot procenium (or are outdoors)

  • rucademoura Just Startin'
    rucademoura
    30 posts since
    Apr 12, 2012
    Currently Being Moderated
    Sep 2, 2012 8:11 PM (in response to eccofive)
    Re: Feedback-Issue after 2 hours of gig... anyone?

    Feedback supression on stagescape is smashing my vocals! If I use it the vocals don't stay linear in volume! At calm parts the sound is GREAT, at hot parts the vocals go Down in the mix! I turned off feedback supression and the vocals were fine...Anyone with this problem!!!???

  • Sussyminds Just Startin'
    Sussyminds
    4 posts since
    Jun 17, 2012
    Currently Being Moderated
    Sep 3, 2012 2:20 PM (in response to eccofive)
    Re: Feedback-Issue after 2 hours of gig... anyone?

    HI there rucademoura are you sure it's the feedback suppressor, it sounds more like the limiter kicking in. I had a similar problem and found that when I reset the trim level it sorted the problem straight away

    YOu more than likely have more knowledge than me as I'm just a beginner of sorts, but I thought I'd share my findings with your good self

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