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1270 Views 5 Replies Latest reply: Mar 24, 2011 9:03 AM by Line6Don RSS
pedgar1 Just Startin'
pedgar1
3 posts since
Aug 18, 2010
Currently Being Moderated

Mar 11, 2011 1:34 PM

Random Changes to Settings

I have the Spider 4 75watt amp that I purchased in 8/10. I also have the shortboard FBV controller. At rehearsal yesterday I was in one of my clean setting playing for a while when all of a sudden I had a heavy flange effect. Looking at my board, the channel did not change (I was in A). I switched to B and then back to A and I was fine. Very Odd.

 

I played fine for about a 1/2 hour more and then it happened again. Heavy flange for no reason. I can't have this when I am performing next week. What's up? Thanks for your help.

 

Paul 

Tags: presets, express, 75, technical, iv
  • Nick_Mattocks Best of the Best
    Nick_Mattocks
    9,065 posts since
    Mar 26, 2007
    Currently Being Moderated
    Mar 12, 2011 7:15 AM (in response to pedgar1)
    Re: Random Changes to Settings

    Paul

     

    There is a phenomenon known amongst other things as 'control knob jitter'

     

    What this does is to move the physical positions of some control knobs slightly due to vibration from the speaker.  When a preset is selected it over-rides the positions of the control knobs, but as soom as one of those knobs is moved, a change is registered in the DSP and your sound can change.

     

    The solution is to physically position all controls (except Master Volume) at 0% and then the controls are less likely to be affected.

     

    Nick

    • pedgar1 Just Startin'
      pedgar1
      3 posts since
      Aug 18, 2010
      Currently Being Moderated
      Mar 12, 2011 5:08 PM (in response to Nick_Mattocks)
      Re: Random Changes to Settings

      I should have also mentioned that I was lining out into a PA when this happened (amp speaker not active). The amp was situated next to a monitor (we are in a small practice room) so it is possible that the closeness of the monitor to the amp may have caused what you are describing. At my next rehearsal, I will turn all the controls to "0" and see what happens. Thanks. 

  • Line6Don Line 6 Support
    Line6Don
    5,274 posts since
    Mar 14, 2011
    Currently Being Moderated
    Mar 21, 2011 2:10 PM (in response to pedgar1)
    RE: Random Changes to Settings

    Hey Paul,

       

      Just like Nick mentioned, sometimes the digital encoder knobs can move very slightly which can can end up causing a HUGE change in tone or effects. The preset's settings have nothing to do with what the actual knob on the amp is reading, so a slight adjustment of the knob can snap the preset's setting to wherever the knob on your amp is set to.

       

      Hope this helps.

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