Observations of quality of tone:
The 2" x 6" pipe tone I have is like a full spectrum audible sound with harmonics and rings\chimes for several seconds after tapped.
I assume this pipe is annealed and relieved of stresses properly.
The 1.75" x 7" pipe tone is (blah) although I can hear the tone its subdued and no lengthy ringing. This pipe is stressed and needs annealing for relief.
Its not lively like the previous pipe.
Another item to work on.
) And, yes, that's Hertz, not kilohertz! And one of the Schumann frequencies I believe. He states that the large central tubes resonate at around 19Hz.
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