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the coolest frequencies are from 1 Hz -30 Hz when played between ears.. out of phase sign waves on each ear causing euphoria, deep thought, relaxation, excitement etc depending on the frequency

You would literally need a speaker that's several feet across in order to generate a pure 20Hz wave - this website says 56 feet wide, in fact, but I'm not sure about that...

http://www.sengpielaudio.com/calculator-wavelength.htm

Every frequency has a wavelength; if the speaker isn't at least as big as this wavelength, it physically cannot produce it.

That being said...

You can also generate this frequency through phase cancellation, where you position two sound sources to intersect at a 45* angle or so; one plays a frequency of (just for an example) 400 Hz, the other plays, say, 380 Hz. Where the two sounds intersect they cancel out everything but the difference, i.e. 400 minus 380 = 20.

the coolest frequencies are from 1 Hz -30 Hz when played between ears.. out of phase sign waves on each ear causing euphoria, deep thought, relaxation, excitement etc depending on the frequency

This is known as binaural signal generation - a variant on the phase cancellation described above, where one wave acts as carrier and is modulated by another wave frequency to produce a third perceived frequency, except that the phasic offset doesn't occur acoustically - it occurs in your brain.

Now, as for the infamous Brown Note: it's not a myth, but it's very difficult to produce correctly, and even more difficult to control. Not something your average garage tinkerer will likely be able to do easily. The specific frequency is around 7 Hz, some say 6.71 or 7.8 something. Look up Schumann Resonance: this is the electromagnetic resonant frequency of the earth and our ionosphere itself...

There's an old story that I've never corroborated about the Germans in WWII developing a sound cannon that could kill men at 70+ meters and even disable aircraft, but the energy required to produce a single blast was so ridiculous it was scrapped.

I could blather on and on about this. It's something I used to read a lot about. Do a google search for "Infrasound" to learn more.

Alphacat wrote: Every frequency has a wavelength; if the speaker isn't at least as big as this wavelength, it physically cannot produce it.

A quick listen to any pair of earbuds shows this clearly isn't the case

(although I'm being facetious - nice post man)

spike01 wrote:

Solshada wrote:
I've ran into some people who say they low pass at 40 hz even. Although they might be using a 36 db slope rather than a harsh 48 or something. Who knows. But basically all you are achieving at frequencies lower than 30 - 40 is the ability on a rare system to shake some trousers (as macc was saying).
But at the cost off eating up valuable headroom in your mix, I would rather just low pass.

I assume that by low pass you actually mean high pass.. low pass would mean that you only allow the frequencies below 40Hz to go through, which would mean that the track would be nothing but inaudible subfrequencies...

Yes I mean hi-pass. Too much ganja sometimes...hahahaa!!

Kulture wrote:

Solshada wrote:23 hz was definitely audible though. Everyones ears are different.

I doubt you heard 23 Hz definitely... 30 Hz is just about audible, 20 is the very very low stretch of what ur brain will pick up but yeh, u probably won't notice it... you probably heard spill over frequencies due to inevitable distortion in the system. I assume

I don't know for sure obviously, but the engineer in the studio was using an oscilloscope which was definitely registering 23 hz... the frequency response of the speakers was more than ample to accomodate as well. I'm not making this up man. Do some research and you will find that many people can hear that low. Like I said it was barely audible but definitely there.. On the fringes of feeling yet audible. This was in a professional acoustically treated control room too. Who knows... Perhaps some sonic trickery of the engineer was at play.

Solshada wrote:

Kulture wrote:

Solshada wrote:23 hz was definitely audible though. Everyones ears are different.

I doubt you heard 23 Hz definitely... 30 Hz is just about audible, 20 is the very very low stretch of what ur brain will pick up but yeh, u probably won't notice it... you probably heard spill over frequencies due to inevitable distortion in the system. I assume

I don't know for sure obviously, but the engineer in the studio was using an oscilloscope which was definitely registering 23 hz... the frequency response of the speakers was more than ample to accomodate as well. I'm not making this up man. Do some research and you will find that many people can hear that low. Like I said it was barely audible but definitely there.. On the fringes of feeling yet audible. This was in a professional acoustically treated control room too. Who knows... Perhaps some sonic trickery of the engineer was at play.

I'm with you, I don't think you can hear that low. You might be able to hear higher harmonics if it is distorting like you say or you might just be able to hear the speaker cone chuffing.

edit - err I meant to quote the post before

Looking around the web real quick tho you might be right. Supposedly you should be able to hear down to 16. To tell you the truth I don't think I have ever been around a system that would play that low faithfully so I guess I wouldn't know.

abZ wrote:Looking around the web real quick tho you might be right. Supposedly you should be able to hear down to 16. To tell you the truth I don't think I have ever been around a system that would play that low faithfully so I guess I wouldn't know.

I'm sure it was in fact 23hz I was hearing... It was definitely not harmonics or cone frap or anything... It was borderline inaudible. 20 I felt, 21 I felt, 22 I felt, 23 I felt and heard... Subtle though it was I heard it. Other students in the room claimed they could hear 20, 21, 22 as well. Others could not hear until like 26 or so... Some people claimed they kind of felt uncomfortable from the low tones they could not hear.

http://hypertextbook.com/facts/2003/ChrisDAmbrose.shtml

pink note = 33hz?

Ive got a CD (ministry of sound maximum bass) wih a tone on it thats 33hz which is called "The honey pleaser", can only hear it properly when im in the car though putting it through my subs, its supposed to make women orgasm!

I want to believe that (a track exists that could make women orgasm just from the bass) but something tells me that if it were true every woman out there would own a copy, and every DJ would cane the fuck out of the tune by now...



As for "hearing" 23 Hz, sound is just air pressure generated by vibrations and it's entirely possible that you heard some sort of resonant freq. or overtone and physically felt the sound pressure generated by it, if indeed it was being produced somehow (50 foot speakers or not).

That ultra low stuf fis what the elephanys jam out to.

Supposedly elephants are so massive that they can perceive the earth pulse through their huge ass fee

I've got a buddy who has bass shakers mounted on the bottom of a yoga bench, when his freqs. drop to inaudible levels you can feel the music 'before' it hits your ears. Pretty amazing really.

I like the idea of having inaural speakers in a lounge club setting, where you only hear and feel the music when you are in particular sitting areas. Mount shakers on the couches and you'd have a relatively noise free lounge/club that still had thump, sans the police intervention.

I also like the idea of reverse engineering the inaural speaker design to create an ultra sonic mic that could pick up signals through walls by modulating laser frequency.

Alphacat wrote:I want to believe that (a track exists that could make women orgasm just from the bass) but something tells me that if it were true every woman out there would own a copy, and every DJ would cane the fuck out of the tune by now...



As for "hearing" 23 Hz, sound is just air pressure generated by vibrations and it's entirely possible that you heard some sort of resonant freq. or overtone and physically felt the sound pressure generated by it, if indeed it was being produced somehow (50 foot speakers or not).

I guess you just have a hard time accepting that someone could hear 23 hz even though there is factual information stating that people hear down to 16 hz. I don't know what else to say here. Also, what makes you think that you need 50 foot speakers to create a frequency that low? Do a little research and you will find that this is simply not the case. The truth is out there...

Hey, I'm open to the idea. Where is this factual information you mention? Citations?

Alphacat wrote:Hey, I'm open to the idea. Where is this factual information you mention? Citations?

Ok so I posted the link regarding human hearing range earlier in the thread, as for the speakers that can produce low frequencies...

Check the frequency response of these cheap wireless JVC earbud headphones http://www.shopping.com/xPF-JVC-JVC-Inn ... -Headphone down to 8hz!!!

Or alternatively check this subwoofer out (second one down) http://www.soundroom.ca/subwoofers.php Hardly 50 feet and rated down to 10 hz..


I hope this helped out!

apparently 34.68hz is the frequency that can cause an entire room of producers to stroke their chins simultaneously.

james fox wrote:apparently 34.68hz is the frequency that can cause an entire room of producers to stroke their chins simultaneously.

LFMAO

/thread