Piezo volume difference between JP guitars….

I have a little question for you guys…
I own 3 “Petrucci” music man :
– A JP6 Piezo, bought second hand. I think she comes from the amercian market.
– A JP 7 Piezo, bought from Thomann (Germany).
– A JPX (Piezo), bought from France.

I use a stereo cable, plugged into the magnetic/stereo output of each guitar.
In this case, the “mix” knob is not usable.

I have found a big piezo volume difference between these guitars :
– the JP6 and the JPX have the same piezo volume output.
– the…

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