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There should be absolutely no problem with two piezos in parallel.
Here's my twin piezo installation.
http://www.cigarboxnation.com/photo/twin-piezos-1
http://www.cigarboxnation.com/photo/twin-piezos-2
The pickups sit close to the two points where the bridge makes contact with the soundboard (I think you definitely want to be close to the bridge but not always necessarily right underneath - I'd agree with whoever said that sometimes there are mysterious "sweet spots" which you can best find by trial and error - but I need to experiment more with this). The theory behind the foam covering is that it insulates them a little from sound vibrations coming through the air thus reducing any tendency to feedback. Ideally they should work as contact mikes picking up vibrations in the soundboard.
At the moment I'm using a 500k pot and that seems fine.
Incidentally, here's a thought on which I'd be curious to hear opinions from anyone with better electronics knowledge than me...People have talked about problems of high impedance with piezos. But if you have the pot wired in the normal way for a volume control (as I do) then you effectively have a resistor (in my case adjustable up to 500k) in parallel with the pickups. Using the standard formula for resistance in parallel, this means that the amp's input sees a resistance of a bit less than the resistanc of the pot. I know impedance and resistance are not the same thing but in certain circumstances they can be treated similarly. So does the parallel resistance mitigate the impedance problems of piezos at all?
Ok totally off topic but did you build saddles for your neck to screw into at two points or did you glue it?
As far as wiring diagrams here is one that has been floating around since the first yahoo forum. If you do not want to install the volume and tone just wire the outputs straight to the jack
I know this is an old thread but can anyone tell me which of the 2 diagrams on wiring 2 piezo's is best? I'm thinking in series like the bottom pic by Moaning Mule would be the way to go maybe?
The bottom one is the way I normally do it - it should be labelled in parallel though (both positives together and both negatives together). I normally don't bother with a tone pot on piezo discs as they don't do much to the sound.
I don't understand all this talk about one or two piezo's. C.B. Gitty himself told me that for the best sound I should install at least eleven piezos in every guitar.
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