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I'm using an acoustic guitar with built-in pickup (on-board pickup - undersaddle pickup specifically), which have a soundhole of course. If I'm playing on-stage, the guitar wil give some feedback sound, which it's kinda annoys me.

How to avoid that? I don't want to use any soundhole cover or move far a (bit, perhaps) from the amplifier or even reducing the volume.

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This is a great question, but could you make it a bit clearer ? Did you mean using an acoiustic guitar with a built-in pickup (so you plug the guitar in like an electric guitar) ? And what did you mean by "without any soundhole cover"? Did you mean you don't want to use one, or your guitar doens't have a soundhole ? and .. "And get away form the speaker" .. this sounds like the answer is in the question, in that getting away from the speaker is one way to avoid feedback. Could you clarify a bit ? Thanks :-) –  user2808054 Jun 10 at 14:59
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I have added the feedback tag - you should read the other questions tagged feedback. –  Dr Mayhem Jun 10 at 15:03
    
@DougusMaximus: I did it. –  seseorang Jun 10 at 15:16
    
much better, thanks ! –  user2808054 Jun 10 at 16:58
    
I guess I don't understand your objection to using a soundhole cover. Soundhole covers only affect your tone if you're playing acoustically or into an external mic. A soundhole cover won't affect the output from an undersaddle pickup at all. –  Kevin Johnsrude Jun 11 at 16:41

1 Answer 1

up vote 4 down vote accepted

Feedback is a resonance between the speakers / monitors and your strings / pickup - the frequency and volume is very position dependent, and the resonance of your guitar will make some frequencies much more prevalent than others, so the usual solutions include:

  • using an EQ, cut the specific frequency that is giving you trouble
  • move away from the speakers
  • move the speakers themselves, or angle them away from you

You can also damp the strings if the problem is string resonance, or add a cloth or damping material into your guitar if it is body resonance.

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