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Crimson tom issue after replacing piezos

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oli43:
Hi,

I had a sensitivity issue with a 10 inches tom on my Crimson (toms with sensitivity knobs).
So I decided to replace the 3 piezos on this tom.
I had to remove the foam which was completely dead and replace it with custom made foam from packaging.
Since this fix the sensitivity came back to normal but I have a strange issue: when I play fast hits rim is triggered instead of center.
If I plug the tom with a TS cable instead of a TRS one, center works as expected and I don't have untriggered hits.
The problem happens with the old foam too.
Any idea to fix this problem?
Thanks.

Chaser:

--- Quote from: oli43 on November 01, 2024, 09:33:59 PM ---Hi,

I had a sensitivity issue with a 10 inches tom on my Crimson (toms with sensitivity knobs).
So I decided to replace the 3 piezos on this tom.
I had to remove the foam which was completely dead and replace it with custom made foam from packaging.
Since this fix the sensitivity came back to normal but I have a strange issue: when I play fast hits rim is triggered instead of center.
If I plug the tom with a TS cable instead of a TRS one, center works as expected and I don't have untriggered hits.
The problem happens with the old foam too.
Any idea to fix this problem?
Thanks.

--- End quote ---

Using a TS Cable instead of TRS just disconnects the Rim Piezo..
The Rim Piezo is directly below the Head Piezo..how was the old one attached?..older designs it was glued directly to the center of the shell..newer design it was glue to an acrylic disc and a foam ring attached it to the shell..the foam ring created a chamber for picking up vibrations..glued directly to shell the Piezo is more sensitive to pick up vibrations transferred from the entire bottom instead of the small chamber.
There are multiple settings..you'll have to either adjust (lower) the Rim sensitivity (RIM SENS) and/or raise Threshold..also HEAD-RIM ADJ which adjusts the signal between the Head and Rim Piezo.
There isn't a single "one setting works for all"..It may take one or 2 or a combination of all of the settings to make the adjustment which is also dependent on your playing style/Head tension etc.
The Sensitivity Knob controls the balance for Inner/Outer Piezo's.
Try setting the Knob from one extreme to the other and make the adjustments.
Set the Sensitivity Knob for the Center Piezo (Head)..make all the Rim adjustments for fast hits...then set to the Outer Piezo (Edge)..repeat.
Then set the Final setting as the difference between the 2...Trial and Error.
You want the Lowest Sensitivity with the Highest Threshold..make sure you do not have too high sensitivity (especially maxed out) on any triggers and the Threshold set too low (especially under 4/5)....that's the biggest mistake I constantly see...you'll have nothing but problems.

oli43:
Thanks for this information.
Unfortunately I can't get it to work changing the sensitivity and threshold settings. I always have rim triggered when I play fast hits on the tom.
I suspect that the foam I use is not fine for this. I tried two kind of foams with different densities but none of them give me a good reslut.
I already replaced foam in DM10 toms using 3M earplugs (the yellow ones) and this works fine. I'll order more earplugs and try its...

oli43:
OK, so I continued my investigations and did some tests putting a 500K potentiometer between the ring and the rim piezo, which has no effect.
I decided to unplug the piezo and discovered that I still have the same issue: rim is triggered when I play fast hits.
Does anyone know where to find a schematic of how everything should be connected?
Thanks.

oli43:
Last test I did: everything is unplugged except center piezo (which is wired directly to the TRS plug board): same problem, rim is triggered!
I really don't understand what is happening...

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