are piezos created equally?

[bladelawless]

I just can not understand why I am getting so much varied response from the piezos in my toms. I get one that works perfectly, one that is so loud that turning the gain down to 0 in MDM has no effect whatsoever, I have two toms that just produce a muffled sound despite turning the gain up to 8 in MDM and another that gives a medium volume. It's nothing to do with settings in Superior Drummer, they are all factory settings, haven't changed anything. I just don't get why the velocities vary so much. I have gone through everything, made sure the heads are all the same tension, triggers mounted properly, checked all my electrical connections. Done everything short of testing these piezos on a multimeter. Do values vary from piezo to piezo despite being sourced from the same manufacturer? Perplexed.

[airflamesred]

They do vary a little though not enough to match your description here.

[dmitri]

How do you test piezos with a tester? You can really only test them with an oscilloscope.
Again, so much difference between your pads suggests there might be wiring problems with them.

[maru_engineering]

Also pay attention to the consistency of mechanical attachment / decoupling dimensions and fixing, from one DIY trigger to the other(s)... I had one loud (roughly double signal strenght) RIM piezo on one of my modified T-Drum triggers (I added RIM piezos on the Tom-Tom triggers like the original Snare trigger had). Upon checking I discovered that for the loud piezo the double side tape used to fix the piezo element to the body of the trigger had a smaller (1 or 2 mm smaller) diameter than the ones that were ok...