[sdiy] About infrasounds

[Tim Ressel]

Wow. You get the oddest questions on this list.

One problem with generating low freqs is the speakers.
A 30Hz wave is 30 feet across. This tough to do with
any kind of efficiency with a 15 inch driver. One way
around this is to use an acoustic transformer, or as
they are commonly known, horns. My Klpisch corner
horns can reproduce down below 20Hz if in a big enough
room.

--tr


--- Israel Sanchez Fuster <issanfus at espacio3.com>
wrote:
> 
> 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
> 


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