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I know guitar feedback naturally comes with high volume while playing in front of speakers, but there are some tips to increase it, such as compression, overdrive, etc. I'd like to know if there is a particular eq setting to improve (positive) feedback as well.

  • Feedback depends on the exact situation, including guitar, amp, effects, temperature, humidity, distance, angle, etc., etc. I would try playing with angle, distance, guitar tone control(s) and maybe a wah pedal. No one can tell you what will help feedback on your rig without playing your rig itself. – Todd Wilcox Oct 19 '15 at 11:01
  • Thank you Todd, I already know that feedback is very singular to location, guitar, amp, and everything affecting the tone "in the moment", but I was wondering if there is some particular frequency equalization that helps positive feedback to came out, if this is physically possible. – Wildchild89 Oct 19 '15 at 13:45
  • By "particular frequency equalization" it sounds like you're looking for something like "boost 400 Hz". A frequency or frequency range would be completely situational, (which you acknowledge), so we can't give you a frequency or frequency range that will work in general. I can't think of anything at all that will help in general - except more volume, gain, and compression, which you already know. Am I misunderstanding your question? – Todd Wilcox Oct 19 '15 at 13:57
  • real feedback is where the instrument (strings, body, etc) vibrate or resonate sympathetically with the ambient sound. The looser the strings, the easier they will respond. Sometimes you can tap the guitar (unplugged) and listen to the tone it makes: the closest notes you play to that tone will probably cause the body to resonate and that can make the strings react. – Yorik Oct 21 '15 at 19:23
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The way that I get lots of feedback for infinite sustain is to use a compressor with the sustain set as high as it will go. That usually does the trick, but you can also use a bit of gain on the overdrive pedal to boost the effect. If you put a wah pedal between the overdrive and the guitar, you can also tune the guitar signal for maximum sustain for your setup. These techniques can work with even modest volume levels.

I'm not sure what you want the feedback for. If it's simply for long or infinite sustains, you can also use a granular synthesizer or "freeze" pedal like the Electro Harmonix Super Ego pedal.

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For feedback (positive feedback) you need plenty of gain. These sorts of experiments tend to be very setup-dependent, but when I did this I used a regular Ibanez solid body guitar, a Boss CS-2 compressor on full gain, a simple DIY fuzz box also on full, and my simple guitar amplifier (10 inch speaker) on very low volume. With this I got plenty of feedback in my bedroom, at normal bedroom levels, by sitting close to the speaker. (The volume was not high enough to damage anyone's hearing at that range either.)

So I would suggest the main thing to do is experiment with lots of gain, and modest volume.

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