is there really such a thing as the "brown note"?

[travis]

?

[planet10]

Blue Note records, Audio Note HiFi gear....

Brown Note???

dave

[travis]

you know, a low frequency that causes loss of bowel control.

[AudioFreak]

OUCH! Yeah there is just like there is notes that will cause internal bleeding, organ rupture, bone destruction and so on .... most of them are in the 1Hz to 5Hz range but queziness and certain other urges can occur as high up as the low teens

[griff]

OMG, THEY KILLED TRAVIS, U BASTARDS!!!!

no there isnt, be fun if there was though

[planet10]

The French Military exprimented with infrasonic sound as a weapon -- the resonance of the human nervous system is somewhere around 12 Hz i believe. they had to quit because it was indiscriminant. Epileptic-like fits.

dave

[mrfeedback]

Hi travis,
is this the 'brown note' you mean ?.

http://oyt.oulu.fi/tbl/archive/VOL1/...9/bl186.html#2

Has anyone out there had experience (on stage or as a spectator)
with these new servo-motor speakers? As I understand it, the
mechanism uses a small motor instead of the usual magnetic apparatus
to move the driver in and out (no nasty jokes, please). This is
supposed to make for a lot longer throw of the cones, resulting in
high output at *low* frequencies. I've heard that Billy Sheehan is
using one and a guitarist told me that he heard that at a Pink Floyd
show one was used and there was a bit of an incident because the
extreme low frequencies caused people in the first few rows to..um..
lose their bowels (so now we need to take Depends to concerts as
well as hearing protection?). But talk about playing with *power*!
I'm sure these things are incredibly and probably huge as well...

These guys are talking about Servo-Drive subs - good for 130 dBA
at 1% or so !. http://www.servodrive.com/

BTW http://www.epanorama.net/links/audio...html#subwoofer is a good resource for speaker and sub builders.

Eric.

[vdi_nenna]

A friend of mine was in the Gulf War and he said the Military used low-freqs to make the enemy very "uncomfortable". But aren't low freqs omni-directional? I guess that means you can't tell where it's coming from, not that it can go in all directions.

[travis]

i wonder if pink floyd really made people poo themselves.

anyone heard about shooting scents at people with a speaker?

[Sawzall]

Yes, low freq tend to be omni, but that does not mean that you cannot aim them. See Meyer, JBL, TurboSound and the other big guys in PA websites. Using stacks of drivers, they can adjust curve of stack, and vary phase (timing) in order to get the wave form that they want.

Same thing happens in the "extreme" end of car audio. In order to get the max SPL at the measure point, they vary phase on each driver so that its wave is additive, not subtractive.

(Wonder if the guys who are using stacks of Shivas in IB config, ala 12 Dancing Shivas, should take this in mind?)