[sdiy] About infrasounds

[Israel Sanchez Fuster]

Hello:

On 21 Apr 02, at 23:43, harry wrote:

> In the mean time... the audience will just WISH they were dead....  ;^P
> 
> H^) harry

I also experienced that kind of one-in-a-million situations, with a 
bass amp feedback on a postrock gig. It was held on an auditorium 
with a dome in the ceiling. Just one second, but the audience get 
shocked for the rest of the week. That is the reason for my interest 
in infrasonics. If you can control that, endless possibilties are open.

I'm aware about the physical response towards the infrasounds. 
Serious body harm only happens with high-powered infrasonics, 
not with the home-made ones. During the WW2, the nazi 
goverment researched infra and ultrasonics as a war weapon. 
Thank God, the war ended before any practical use was achieved. 
With low-powered infrasonics, you only get nausea, headaches 
and bad vibes on the audience. And those things are very difficult 
to achieve these days, when so much shit has been broadcasted.

If I'm not wrong, generating infrasounds is easy. The main problem 
is to amplify them, right?. Then, you only have to reduce the 
vibrating membrane frequency of your amplifier.

If the equation of a vibrating membrane is 

f = Sqr (S/M) / 2 * D

Where S = stress, M = mass and D = diameter. 

As reducing stress is difficult and increasing the diameter almost 
impossible... Should increasing the mass of the membrane a valid 
solution?. It's easy (soaking it with jelly or something like that)

I promise to tell you what happened....

"Nastiest sound you'll never hear"