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RE: Piezoelectric crystals

A couple of questions...

1. Doesn't the container, i.e. Jar or Bag make a large difference in how rocks rock?

2. So if one were to set up his SPL meter on it's cute little tripod in the corner, note the SPL vs Frequency of a swept tone and THEN add the jar of pebbles and repeat... what sort of deltas would one expect?

I've come to believe that the details of acoustical specular reflections and general absorption have an outsized impact on our perceptions but I don't how to optimize it except raw trial and error.

On another note, you offer small packages of pebbles intended to be stuffed or propped where wires enter gear. Is that mechanical also?

Rick









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