[sdiy] About infrasounds

[Israel Sanchez Fuster]

Hi:

This is my first message to the list. I hope I can learn a lot about 
synth building and all the electronics around. My real intention 
when I suscribed to the list was to ask if someone has an idea 
about how to generate infrasounds (I mean sounds lower than 15 
Hz) on stage.

I am sure that an industrial music band called Throbbing Gristle 
(sure that some of the members know them) used to generate 
infrasounds on their gigs, what caused awful reactions on the 
crowd. 

Some people related with university physic departments told me 
about changin the medium to low the speed of wave and, 
subsequently, the frequency. But I'm not too much sure if the 
crowd of a gig would agreed to drown onto a pool of jelly just to get 
nauseated with some infrasounds. Or maybe they would be, who 
knows.

The question is, in fact, is there any possibility of reducing the 
frequency of a synth-generated wave until the depths of infrasounds 
(lower than 15 Hz, I think)?

Thanks in advance