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Permalink Reply by JL on July 17, 2017 at 12:47am

Mostly none, the size of the crystal determines the 'strength' of the signal it generates, and there is some capacitance value in the disk that is a tiny fraction of the value of 0.01uf with bigger disks having a tiny bit greater fraction than a smaller one.

If a rod piezo works fine and its much less crystal than a disk, then a 20 should work as well as a 27.

Mostly, depending upon your amp rig and your ear, its probably an unnoticeable difference, maybe tiny itty bitty difference if you have a sensitive ear and do a side-by-side with identical instruments...

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Permalink Reply by Timothy Hunter on July 18, 2017 at 12:07am

you could always try 2 of the 20 mm disks.  area of 2 20mm disks is only slightly bigger than the 27 mm disk..a bit of experimenting might be in order. see what sounds best to you?

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