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I finished my second build last week. A three-string fretted CBG. I went to Gitty for piezo disk. I saw that they had 12 mm, 20 mm and 27 mm. I figured "What the heck, isn't bigger better?" so I opted for the big 27 mm pieces.I bored a countersink in the side of the neck (inside the box) and mounted the piezo in a bed of silicon seal top and bottom.

I'm feeding the piezo into one of the small 2.5 watt amplifiers I built into a spare cigar box. When I play my original frettless CBT into the amp, the sound is good (not too loud) and not too sensitive to my movements around the box (even with everything turned to the max). This one has a single 20 mm piezo.

When I crank up the volume knobs on my amp and new CBG (the one with the 27 mm disk) the amp picks up every stray movement of my body and hands. I slide my hand across the body of the box and it is amplified noticeably. I can turn down the pot on the CBG to reduce this unwanted sound, but, of course, give up string volume.

My question is: Is the 27 mm disc noticeably more sensitive than a 20 mm unit? Should I look at adding more damping around the Piezo? Maybe encase it in soft leather or something? Should I remove it from its attachment to the neck and mount it in a less sensitive area?

I like the string volume of this CBG, but think I may have taken a wrong turn on either selecting the piezo or in my mounting scheme.

Thanks for any suggestion or insights you may have.

Tom T