Can An Electro Acoustic Guitar Be Used Without Feedback

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Anyone who plays with an semi acoustic or electro acoustic guitar will know that you are constantly walking the tightrope of uncontrolled, ear piercing feedback. Not the controllable beauty that has adorned many a performance or recording, the beast that makes you feel sick when it crashed through your aural calm.

As someone who has regularly experienced this I wanted to find out why this happens and what I could do regarding it. You'll find so many elements which might lead to you having feedback from a instrument, but once we're able to realise why it takes place we might have the capacity to regulate it and after that eradicate factors including the room, guitar effects, body shape maybe the garments being worn since they will all affect it.

So, all items have an ideal sound frequency that it's going to vibrate best at. An electro acoustic guitar was made to comfortably vibrate within a full selection of various sound wavelengths e.g. getting a louder sound. Fundamentally this is just what resonance is. The technology bit is usually that whenever the guitar strings vibrate on the acoustic guitar they will shift air around them which then goes into the guitar hole and changes the air pressure in the guitar. Since the strings are attached to the neck and bridge this causes the guitar to flex which again causes the air around the guitar to move.


Every guitar has frequencies that it's better at amplifying than others. Whenever a loud sound is played with the frequencies that it likes, the guitar will amplify those a lot more than other frequencies. There is a transducer that takes that sound and feeds it back into the guitar through the amplifier, thus you've got a feedback system. This is known as positive feedback as there is a net gain in amplification.

What happens is that your guitar will feedback at a certain frequency which the guitar resonates at. If you play a sound without this frequency in it or perhaps a sound much lower than the others it will resonate but not as much, because generally resonance works on a logistics scale where the feedback cycle grows very quickly then reaches a point where it just can't go any higher.

So the question is can you control this type of feedback? One way is to find the resonant peaks of the guitar and equalise them down which is very difficult and you would probably end up having issues with your guitar. A better way is to change the position of the guitar in relation to the amplifiers. A guitar is three dimensional and its resonating frequencies exist in 3D space. They are not symmetrical and the frequency may be dampened by the human or guitar body along its way to the guitar's sound-hole. By altering how much acoustic resonance you are able to alter the resonant frequencies or dampen them enough to lower the feedback. You can do this by adding/removing weight on the guitar or adding material in the sound-hole of your guitar that alters the shape of the sound-hole. Have you ever seen bands where the sound-hole in the guitar is blocked up by tape?


Even solid body electric guitars can experience feedback and reduced amp level is often the only way to eventually manage it. In fact there's a stage where regardless of what you are doing you can expect to always acquire positive feedback.

Having said that, amps can be developed for lower feedbacking from an electro acoustic guitar. A higher gain has a propensity to feedback far more than a lower gain one.

Legend Guitars are a helpful online guitar shop that will compare United Kingdom website pricing to find you the right selling prices for guitars and guitar associated extras. They will focus on the electro acoustic guitar and have a pretty cool free online guitar tuner that has more than sixty different tunings that can assist you compose a masterwork! http://www.legendguitars.co.uk

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