Selective Feedback?

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nate_dennis

nate_dennis

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I was at practice the other day. I'm running a DeArmond full hollowbody into a vox ac15cc1. I noticed that any time I played an open G chord i got feedback. But that was the only chord that would feedback automatically. I mean, I could coax it to feedback with other chords, but the G was automatic. Do any of you know why that might be? Thanks.
 
nate_dennis said:
I was at practice the other day. I'm running a DeArmond full hollowbody into a vox ac15cc1. I noticed that any time I played an open G chord i got feedback. But that was the only chord that would feedback automatically. I mean, I could coax it to feedback with other chords, but the G was automatic. Do any of you know why that might be? Thanks.
Click to expand...
Body resonance. Sometimes turning at a different angle to your amp will alter the pitch.
 
It's physics and it's called sympathetic resonance. Everything has a natural frequency. When something else vibrates at the same frequency, it causes the first object to start vibrating.

An example is when you are driving and hit a certain speed and something on the dash starts vibrating (even a squeak or rattle). Go faster and it stops. Go slower and it stops. Go the right speed and it starts vibrating. This is due to the tires or engine vibrating at the natural frequency of that object.

In your G-chord example. That particular chord was at a natural frequency probably of the guitar body that caused it to vibrate in a way that led to feedback.
 
This doesnt answer you're question but...

I find with my hollowbody that certain notes make the guitar make a kind of "woof" sound, like its hitting the natural resonant frequency of the guitar or something.

Maybe this is a similar effect?

Ive also gotten this phenomenon with a really old beat up electric. Is this some kind of defect in the guitar?

edit: ok, so like 3 other people responded before I got my post in, so i guess question answered. but..

its still kind of annoying isnt it?, is this inherent of a lower quality guitar? my les paul and tele never "woof".
 
Last edited:
BigMuffinMan said:
This doesnt answer you're question but...

I find with my hollowbody that certain notes make the guitar make a kind of "woof" sound, like its hitting the natural resonant frequency of the guitar or something.

Maybe this is a similar effect?

Ive also gotten this phenomenon with a really old beat up electric. Is this some kind of defect in the guitar?

edit: ok, so like 3 other people responded before I got my post in, so i guess question answered. but..

its still kind of annoying isnt it?, is this inherent of a lower quality guitar? my les paul and tele never "woof".
Click to expand...
It's inherent of a hollow body guitar.
 
Washburn100 said:
It's physics and it's called sympathetic resonance. Everything has a natural frequency. When something else vibrates at the same frequency, it causes the first object to start vibrating.

An example is when you are driving and hit a certain speed and something on the dash starts vibrating (even a squeak or rattle). Go faster and it stops. Go slower and it stops. Go the right speed and it starts vibrating. This is due to the tires or engine vibrating at the natural frequency of that object.

In your G-chord example. That particular chord was at a natural frequency probably of the guitar body that caused it to vibrate in a way that led to feedback.
Click to expand...

This is what I thought it would be, but I didn't want to sound like an idiot.
 
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