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Hiya
does anyone have any info/experience of producing sound below the 20 hertz barrier?
Ive heard that the effects on the human body can be quite surprising, including inducing a relaxing state by playing at 10 hertz, also at other levels, inducing the production of serotonin, and even involuntary bowel movement! (a brown note).
ta
Rich
Xx
tribes.tribe.net/projectx
does anyone have any info/experience of producing sound below the 20 hertz barrier?
Ive heard that the effects on the human body can be quite surprising, including inducing a relaxing state by playing at 10 hertz, also at other levels, inducing the production of serotonin, and even involuntary bowel movement! (a brown note).
ta
Rich
Xx
tribes.tribe.net/projectx
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Re: Sub 20 hertz
Wed, November 9, 2005 - 10:16 AMi do not have experience, but producing such a low frequency has to do with using binary beats, playing 2 sounds together. the overlap cretes a third, you get a kind of warbbling effect. 10 hz can be creates using a audiable multiple of that frequency, say 100hz (10 x10) and another, which i cannot calculate, but lets say for example 400hz (40 x 10).
i am on a buzzzzz about 8hz at the moment. the more i reearch it the more i am amazed. you may find it interesting.
8hz alpha frequency is the most dominent frequency tuned tuned into by healers and mystics. its the schumans resonance, or also known as earths heartbeat, dicovered by schuman. 8hz has also been refered to as a the main frequency permetting the univerese which is the main reason mystic tune into it (think of it as like a cosmic superglue. it connects everything up. the no 8 unites 2 seperate circles). 8hz unites the 2 brain hemispheres inducing a plethora benefits such as whole brain thinking, superlearning relaxation, increase serotonin production (assosiated with any sleep and alpha meditative state) ect.. you could say that with the 8hz frequency, things REALLY happen.
regards -
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Unsu...
Re: Sub 20 hertz
Thu, November 10, 2005 - 9:13 AMI think that the frequency of the warble is the difference in frequencies...
so... 100hz and 108hz would create an 8hz beat... -
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Unsu...
Infrasound (< 20Hz)
Thu, November 10, 2005 - 12:48 PMThe "warble" is produced by phase cancellation...
Check out this thread:
auralsex.tribe.net/thread/e...5676e4b47
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Unsu...
Re: Sub 20 hertz
Wed, November 9, 2005 - 11:40 AMThe Mythbusters took a crack at the brown note and failed. They had John Meyer and his top acoustician with quite a large array of speakers focused on the mythbuster guy. At like 150 dB of all frequencies between 1 and 20... no bowel movements. However, the guy's voice sounded really weird with all that sound presure coming at him.
They actually did manage to break glass with a high frequency. -
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Unsu...
Re: Sub 20 hertz
Thu, November 10, 2005 - 4:52 PMYeah, there are a lot of urban myths about the brown note, including accounts of bands "my friend saw this band in New York..." that use those frequencies with SHOCKING and HILARIOUS results.
There is a lot of evidence supporting other impacts of powerful audio projections at specified frequencies, for instance the high-freq cannons installed on cruise ships (used effectively to repel pirates off the coast of Somalia last week), or the perceptible vibrations in different specific parts of the body when playing Tibetan crystal bowls, or the decline in shark, whale, and dolphin populations in areas where the US Navy's ELF system is in use.
But so far as I know, no evidence supporting the brown note story. -
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Unsu...
Re: Sub 20 hertz
Thu, November 10, 2005 - 9:21 PMThis gives new meaning to the term
"That music is the shit !!!"
dj johnny primitiv
"psytrance for a better world"
streaming everythursday night @
www.desertfm.com:7000/listen.pls -
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Unsu...
Re: Sub 20 hertz
Fri, November 11, 2005 - 12:55 PMfrom the Wikipedia page "Brown Note":
"Other researchers have noted flaws in the methodology of the experiment. Rather than test the entire spectrum below 20 Hz, the MythBusters tested only three specific frequencies: 5, 7, and 9 Hz. In addition, the strategy of surrounding the subject with speakers without accounting for phase effects would have resulted in a loss of effective power being transmitted, especially at the geometrical centre of the speakers." -
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Re: Sub 20 hertz
Sat, November 12, 2005 - 3:35 PMyeah...8hz, the frequency of your alpha-brainwave frequency transmitting synapse control, higher tinking..neural mapping, etc....also terraform related, as our planet has the same patterning..at 7.8 (8hz)
shumann resonance is been around and documented well. I think this shows subsonics are felt and/or reacted upon...rather than heard
interesting that the brain will still process an unamplified carrier....
so have fun thinking...you just went subsonic ^_^
namastae
Jack
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Unsu...
Re: Sub 20 hertz
Wed, November 16, 2005 - 10:05 PMShort story: Think outside the box.
16th note hi hats in most dance music, for example. Would you say that those are about 6-9 hits-per-second? Well usually they are! So there's your "sub 20 Hertz" right there! Your alpha waves LOVE hi-hats! Talk about great stimulation... And let's see... Kick drums in trance music at 130-145 BPM are, i dunno, about 2 hits-per-second. That's Delta- low Theta country.
The brain isn't looking for an 9Hz TONE to stimulate the Alpha, or a 5Hz tone for the Theta or even 1Hz tone for the Delta, for that matter! It's just looking for some stimulation to happen in order to encourage, for example, the Alpha waves.
Just like the classic example of bringing a tuning fork into a room full of guitars. When you hit the right frequency they all start to resonate.
Look at those light/sound machines. Flashing lights and pulsating sounds are used to stimulate A/B/D/G/T waves. However, they don't use 9Hz tones - they use something like a 150Hz - 200Hz tones in pulses at 9 cycles per second. Same concept with Binaural Beats.
What's *really* cool, though, is that "brain wave manipulation" is very commonplace - almost essential - with music. Actually that's practically all music is.
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Re: Sub 20 hertz
Tue, November 22, 2005 - 7:51 PMÌ think low-frequency soundwaves have been used as weapons. Or at least research was done. The brown note might be a myth, but supposedly various frequencies can induce nausea and anxiety, headaches, that sort of thing.
But what do you mean by the 20 hertz "barrier"? There's no limit there, except for your speakers. -
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Re: Sub 20 hertz
Tue, November 29, 2005 - 7:49 AM20 hertz is gererally accepted to be the lowest range of human hearing, i.e. any frequency below that can't be picked up by our ears and is thus labeled "subsonic". Your individual range of hearing may vary, especially if you happen to be a whale or an elephant. -
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Unsu...
Re: Sub 20 hertz
Tue, November 29, 2005 - 9:12 AMa few years back I went to a subwoofer array demo put on by the AES at the Paramount Theater in Seattle...
to demonstrate... they would play a sine tone sweeping from 300 to 5 hz...
sorry... no stinkies! -
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Re: Sub 20 hertz
Fri, December 2, 2005 - 9:36 PMI just love the sub demos at AES. Every year a manufacturer or two periodicaly fire off loud booming bass tones - like an audio geek mating call or something.
Fortunately my booth has always been far away from them :)
In Barcelona this year a manufacturer of some live sound array had a system dangling from a crane a few hundred yards away from the convention center entrance. The entire week they were playing the same Genesis song at insane levels (of bass). I was afraid to walk close to the building because it sounded as though the bass was going to shake the glass loose :)
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Unsu...
Re: Sub 20 hertz
Mon, January 9, 2006 - 1:37 PMlist of RIFE tones including sub 40hz sounds utilized to interface with the human bio-computer: www.lunarsight.com/freq.htm
as far a generating tones, binaural beats, two tone in each ear, the aforementioned brainwave entrancement...generally the only way to go that I'm aware of, without having a physical old square/sine/etc. unit present that goes to those freqs and hooking yourself up to it VIA EEG body contacts and the likes...you could theoretically record the sounds those units produced as well but you'd need equipment that could work within that bandwidth all the way across the board in your setup...anyways cooledit2 has a plugin that'll turn samples into binaural beats and bwgen.com has a good tool for making simple binaural tones...only really effectve if heard through headphones though...not very practical for music :( -
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Re: Sub 20 hertz
Tue, January 10, 2006 - 12:15 AMthought i'd bring up binaural beats again... check this out, it generates binaural beats!
www.bwgen.com/ -
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Unsu...
Re: Sub 20 hertz
Wed, January 11, 2006 - 3:12 PMSo the binaural effect I've only heard about, never researched it. Some psychologists are even using it for therapy. Can't testify one way or another.
I can say though, that it's completely different from playing a note low enough to release your sphincter. That theory is to play a single low note loud enough and at the right frequency.
Speaking of mythbusters, while they never reproduced the brown note, they did show you can shatter crystal by singing. The principle is exactly the same: find the fundamental resonating frequency of an object (or ring of muscle tissue), play it loud enough, and the object will resonate along with it. Once it starts resonating, if the sound is sustained, the wave patterns you're still applying will reinforce the resonance already happening in the object, causing it to resonate more an more (unless you get out of phase for some reason). Keep going long enough and something has to give. A glass shatters, a sphincter releases, etc. Several newly built bridges have been destroyed by wind for this same reason. All of this is both practically documented and theoretically backed up by physics, no shit. Um, so to speak. -
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Unsu...
Re: Sub 20 hertz
Wed, February 22, 2006 - 10:49 PMThe thing is that I don't think the human body can really resonate like that.
Our organs are heavily dampened, and the materials probably vary enough to provide ample dampening at any frequency.
The bridge you speak of is a textbook example of why engineers design dampening into large structures. I actually had an engineering textbook that uses that as an example.
Why is it that nobody has found a "plastic" cracking note? Because plastic deforms more easily, it's an elastic material... like flesh. Chrystal on the other hand has the well known property of being an ionic lattice, deformation causes very clean cracks.
Perhaps the brown note (if it exists) just scares the crap out of people, but I'm beginning to doubt that it physically causes your bowels to constructively resonate. -
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Re: Sub 20 hertz
Thu, February 23, 2006 - 3:05 PMto actually make the tone audible (not like you can hear it or anything) or otherwise produce it into air, you have to build a reverberant wall thats pretty big and make something shake the wall, or at least ive heard stories of these guys who did that and then had the federal agents come to their house and say "stop that or well kill you" or something to that extent.
the men were speaker builders or physicists, quite intelligent, and they used the machine a few times and brainstormed ideas. they said that the frequency they produced with it stimulated higher thinking. -
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Re: Sub 20 hertz
Thu, February 23, 2006 - 3:15 PMand by the way, the government has had for years LRAD and MRAD tech in their pockets,and that utilizes extremely high frequencies
thats what makes you shart.
they use it for "crowd control" and the tech companies that make them are also in the pockets of the US gov.
find out more at American Technology Corporation
www.atcsd.com -
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Unsu...
Re: Sub 20 hertz
Sat, February 25, 2006 - 12:24 PMHm, ultra hi-frequency would lead me to believe that the defecation is a result of neurological effects and not physical chaotic resonance. In other words, people shit their pants when they get really scared and think they're about to die. -
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Unsu...
Re: Sub 20 hertz
Sat, February 25, 2006 - 1:01 PMHo damn, nice link! Now I'm interested again.
The gigantic diaphragm problem is a really good point, but remember that you can also create a directional wave by simulating a gigantic diaphragm using an array of smaller diaphragms. If they're close enough together, or spaced appropriately they'll be phase locked via the air with the other diaphragms, making each one constructively interfere. That could give you pockets of really really
This is interesting because I have seen a lot of different large speaker placements at parties, but never have I seen the sound engineers at big shows actually measure speaker placement on the subs. The bass tones in modern electronic music are pretty narrow-band (50-80Hz). I would say that at roughly 20 feet you'll be getting some good constructive interference. Making sure all bassbins are on the ground helps too (reflecting the wave up and doubling the effective power). It would be interesting to get a db meter and see just how much of a difference in loudness / directionality you can get by rearranging the speakers.
Back to the speaker array idea.
The speed of sound in air is known to be about (331.4 + Tc)m/s where Tc is the air temperature in celcius, this works for "reasonable" temperatures of air, but the true equation is non-linear with the change in temperature I think. So at around 21 degrees celcius (around room temperature) sound is travelling at like 344.21m/s (1129.29 ft/s).
Wavelength = velocity / frequency, so at 7Hz we're talking a 49-meter wave. Your spacing would be around 49-meters (!!) to cause constructive interference, but your diaphragm amplitude would need to be huge along with the force with which you drive the thing to get the same power you would get from a 80Hz wave (power goes up with the square of frequency).
So, could you do this without attaching a linear-drive motor to a wall? Maybe.
I would imagine that by the time you got enough power out of the damned system to cause defecation (because of the dampening), you would have a hard time breathing at the focal point anyhow. Sounds like fun.
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