Guitar Pickup Adjustment
Guitar Pickup Adjustment
2 Guitar pre-amp D.I. box questions?
I have this guitar
http://www.musiciansfriend.com/product/Epiphone-Masterbilt-DR500ME-Acoustic-Guitar?sku=518106
It has (no equalizer or adjustments of any kind etc.) but does have pickups obviously and a stock plug preamp. Question is do I need a D.I. box (external preamp) to plug into a P.A. for best sound????? (Or is it really necessary? It already has a stock preamp) Also, I get horrible feedback when plugged into an elctric amplifier, why is this and how can I correct it? Thanks to both questions!
It's an electro-acoustic guitar so the sound board will pick up vibrations from the loudspeakers and the sound hole will let amplified sound into the guitar where it will then resonate beautifully inside that huge dreadnought body. All this is then picked up by your on board pick-up (piezo?) which sends it back to your amplifier where the whole cycle kicks off again. Result - feedback. I don't disagree with the previous answers except that I would suggest fitting a feedback killer to the sound hole of your guitar. This is a rubber pancake thing that just sits in the sound hole and helps to stop amplified sound entering the guitar and resonating around inside it. They are not expensive. As has already been suggested, do not stand in front of or too close to the speakers and keep the overall volume low enough. If you need volume, then you need to think about other solutions. My Marshall acoustic amplifier has a feedback limiting circuit that can be switched in though you lose a little sound quality. My guitars all have a notch-filter on the pre-amp so I can sometimes tune-out the feedback frequency - no good for full-on screeching feedback. One of my guitars has a phase-shift switch which changes the phase of the wave leaving the speakers so reducing the likelihood of feedback returning - as long as I remain where I am. Finally, some acoustic effects pedals (eg Zoom 504) enable you to select a level of feedback suppression with each effect. The inexpensive but pretty effective solution is the feedback killer in the sound hole. Good luck - I know how frustrating it can be.
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