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Freqencies

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vortex2009

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Hi all,
Im interested in building a type of oscilliator.. which send out high SPL sound Pressure waves, say like I got my hi fi loude speaker I want to put throught a high sound pressure ie (To feel it not exactly hear it..!!! is this possible..

the SPL in db Im after is about 140DB.. any help or links will very helpfull..
or does anyone know the frequency that Ive heard once, on a television Programe, that makes one blush.. red) as I remember its a really weird low hum.. dont know anything on that..
thanks in advance
from
vortex2009
:D
:eek:
 

tcmtech

Banned
Most Helpful Member
140dB !
Your going to need a load of power and some very big and efficient speakers to hit that!
Like several of multi Kilowatt level amplifiers and about 6 -10 subwoofers that are around 15 -18 inches in diameter!

If you can get around that 20 hz mark at that SPL you will pee yourself.:eek:
That will make you blush very red! :D
 

Mikebits

Well-Known Member
Hope it is not a Brown note amp :)
 

vortex2009

New Member
SPL's



Hi,
thanks for the replys,... perhaps I went a bit over the Top with the SPL level
(lol) .... I'm Just very interested in acoustics and the raw power of Sound..

A Audio hearing person.. in his training days... done a Joke on his colleges he set up a Subwoofer and put a certain frequency through the woofer.. and they really SH*t themselves..
how awfull is that...
thanks for the replys guys anyhow...!!

PS: Whats a Brown Note?
regards
vortex2009
:D
:)
 

Papabravo

Well-Known Member


...
PS: Whats a Brown Note?
regards
vortex2009
:D
:)
A note of a particular frequency that causes you to soil yourself.
Mythbusters concluded that no such thing exists, but only a fraction of the sentient beings on the planet actually want to believe them. They would much rather believe in overunity and HHO and other outrageous propositions.
 

ronsimpson

Well-Known Member
Most Helpful Member
Myth??? I don’t know!
What I tried to get the 7 story elevator shaft to resonate in the dorm at school. By resonating, it should take less power. It is hard to fins speakers that run well at 15-20hz.
 

audioguru

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The speakers that Mythbusters used performed poorly at the very low frequency that was needed for their test.
 

Hero999

Banned
So what are you saying that there might actually be a brown note?
 

Sceadwian

Banned
No, but you hit resonance in an elevator shaft and you're gonna scare the crap out of people. Close enough to a brown note for me =)
 
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tcmtech

Banned
Most Helpful Member
I can recall my high school days and having a pair of 12 inch subs running at 500 watts RMS each that fired right through the back seat of my car.

There was a "Pee Note" that affected a few girls that sat in the back seat!:eek: ;) :D
 

Ubergeek63

Well-Known Member
the best way is to use tweeters and drive one with say 20KHz and the other with 20.02KHz

this technique is used to do directed audio in museums since ultrasonics travels straight in a beam and mixes to produce audio when it hits the target

Dan
 

microtexan

New Member
Brown note

I remember reading in an issue of Playboy magazine (yes I read the article too) there was a Brown Note at 57 Hertz. Police supposedly used it for crowd control:(:eek::D
 

Mikebits

Well-Known Member
I remember reading in an issue of Playboy magazine (yes I read the article too) there was a Brown Note at 57 Hertz. Police supposedly used it for crowd control:(:eek::D
Well, now there is a fine journal, it must be true :rolleyes:

Actually, the alleged brown note is below human hearing. Somewhere around 5 to 9 Hz.
 
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