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Is it a disk or a rod piezo? Exactly how is it externally fixed? What gauge of strings and tuning? Does it have this same problem when played acoustically, or only when amped?
Hi there thanks for the response. It's a 20mm disc piezo fixed to the neck under the bridge ( hole in cigar box). It is cushioned by a rubber grommet and fixed to the grommet with soft silicon. The problem isn't as bad acoustically but is still a little twangy.. The bridge is timber with grooves cut... Could the groove be to wide? The string is 13gauge plain steel. Tuned to open g
CLOCKWORK said:Is it a disk or a rod piezo? Exactly how is it externally fixed? What gauge of strings and tuning? Does it have this same problem when played acoustically, or only when amped?
Well, if you've got twangyness acoustically its usually an action problem, that or the string is not tight enough or too loose. The notch could be too wide and the string could be floating about in the nut or bridge. Also, the string could pull down on both sides of the nut instead of just on the headstock side. You WANT it to pull down on the headstock side, but NOT on the neck side. Also, you might want to see if changing the angle of the bridge does anything. As for lacking punch for the light string, I know this may seem painfully obvious and you've probably already thought of it, but that could be as simple as getting the piezo closer...
Part of the problem is the piezo being on the neck. It needs to be on the box lid (IMHO).
The reason: the neck has a lot of mass ... most of the cbg mass infact ... lower frequncies travel through the mass better than the higher ones do. The neck will work. I have used piezos on the neck, but only on d-bows where a wide range of frequency response isn't needed.
The box lid will vibrate much more than the neck. Piezos work on vibration not sound.
There can be other factors, but try relocating the piezo .... also IMHO, get rid of the grommet .... you can have too much dampening ..... like I said, piezos need vibration.
AFKAM
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