There is a large blower fan in a building were I work. It puts out massive amounts of 30Hz and not much else. I can hear it and feel it too. Makes me wonder what a strong 15Hz would sound like. Not sure if I'd really hear it or just feel it.
Great recordings. Attached are RTA's for the fireworks (long) and unmuffled Harley, one of the great motorcycles designed in 1945 (I ride a 1999 R1100S BMW).
The fireworks have low frequencies but I'm not sure how that relates to anything in music. (The red shows all the peaks all through - ignore the black.)
The unmuffled Harley RTA is rather like what many audiophiles mistake for great bass - actually much power in the 80 Hz range.
B.
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