0.75Hz

dvsDave

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I got an email for a new kickstarter product and some of the product's claims caught my eye.

This QOTD is open to all right out of the gate. Show the math and reasoning for why this product's claims are highly suspect.

10Hz.jpg
 
Mostly because the ear bottoms out at around 20Hz?
Ignoring that, it's an awfully small driver to audibly reproduce sub-sonic frequencies on the scale of a room rather than headphon-

waaaait, is that little thing battery powered?
 
Mostly because the ear bottoms out at around 20Hz?
Ignoring that, it's an awfully small driver to audibly reproduce sub-sonic frequencies on the scale of a room rather than headphon-

waaaait, is that little thing battery powered?

No idea, it's on Kickstarter as the Banala Lite.
 
L:ike most of such products, it's a device to make $$$ for the seller. He'll make a bunch of it before enough publicity about "Another useless product" appears and he DISappears. People will by anything.
 
I highly doubt this device can produce a .75 hz wavelength... a 10hz wave is 112' in full length.... that's a lot of wave to push through a 3" driver....
 
Fun fact: A 10Hz wave is approximately 200 bananas long.

Bananas, being a ANSI standard measurement for distance. I've created a helpful Frequency to Bananas reference chart, applicable so long as your bananas are stored at room temperature.

upload_2019-10-2_14-42-51.png



EDIT: Had the incorrect Feet:Bananas conversion at the bottom. Fixed it.

1 Banana = 7.008 inches, per international standard.
 
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Fun fact: A 10Hz wave is approximately 200 bananas long.

Bananas, being a ANSI standard measurement for distance. I've created a helpful Frequency to Bananas reference chart, applicable so long as your bananas are stored at room temperature.

View attachment 18524
You win the internet today
 
Hm... I'll have to break out my physics textbook and notes to get you the math (when I have a bit of that free time stuff), but there is absolutely no way that will put out frequencies that low at any meaningful amount of power.

Bananas, being a ANSI standard measurement for distance. I've created a helpful Frequency to Bananas reference chart, applicable so long as your bananas are stored at room temperature.
View attachment 18524
Can I eat the bananas before I make my measurements, or do I have to wait till my state/federally required break? Does use as a measuring utensil effect the nutritional value?
 
Hm... I'll have to break out my physics textbook and notes to get you the math (when I have a bit of that free time stuff), but there is absolutely no way that will put out frequencies that low at any meaningful amount of power.


Can I eat the bananas before I make my measurements, or do I have to wait till my state/federally required break? Does use as a measuring utensil effect the nutritional value?
No but Mike's chart has real apeal.
Toodleoo!
Ron Hebbard
 
It's all good until Blue Man Group shows up and the props guy "borrows" your *calibrated* banana...
 
It's all good until Blue Man Group shows up and the props guy "borrows" your *calibrated* banana...
I wonder if there are Imperial and Metric calibrated bananas??
In my shop daze we built at least two sets for the Blue Man Group, complete with gentle rakes and a gutter across the DS edge for hosing down between performances.
Toodleoo!
Ron Hebbard
 
There was a research group, years ago, using Harmonics to induce lower brainwave frequencies in the auditory processing centers of the brain. The idea was simple enough, run a 100Hz tone in one ear, and a 101Hz signal into the other and the Nerve pulses harmonize and create a 1 Hz. Pulse in the Brain. I don't know how this would work with a single speaker as the original system required headphones to isolate the tones stereoscopically.
I think using a motorcycle helmet with transducers firing Targeted Magnetic pulses is a much better, much more proven method of inducing particular brain waves.
 
10 Hz and 100 Hz would produce 110 Hz and 90 Hz resultant frequencies, not 1 Hz. (More generally, the new frequencies are the sum and difference of the originals.) There is not generally any need to isolate the sounds to accomplish that. There are plenty of examples in everyday life where miniscule differences in the frequency of two sounds beat at a clearly heard low frequency; one good example is flying on a twin engine propeller airplane when the engines are barely not in sync, resulting in that breeeoooaaaeeeoooaaar sort of sound.

This basic technique is sometimes used on pipe organs to obtain something resembling pedal bass stops that otherwise would need a pipe that is inconveniently long. Instead of a 16' stop, for instance, a small instrument may employ an 8' stop (2x the frequency) and--if memory serves--a 5 1/3' stop (3x the frequency) sounded together.
 
There was a research group, years ago, using Harmonics to induce lower brainwave frequencies in the auditory processing centers of the brain. The idea was simple enough, run a 100Hz tone in one ear, and a 101Hz signal into the other and the Nerve pulses harmonize and create a 1 Hz. Pulse in the Brain. I don't know how this would work with a single speaker as the original system required headphones to isolate the tones stereoscopically.
I think using a motorcycle helmet with transducers firing Targeted Magnetic pulses is a much better, much more proven method of inducing particular brain waves.
@Van Did this lead to lack of bowel control and containment issues?? This sounds like experiments Mr. Danley would run and / or something the German's would've experimented with in the second world war.
Toodleoo!
Ron Hebbard
 
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10 Hz and 100 Hz would produce 110 Hz and 90 Hz resultant frequencies, not 1 Hz. (More generally, the new frequencies are the sum and difference of the originals.) There is not generally any need to isolate the sounds to accomplish that. There are plenty of examples in everyday life where miniscule differences in the frequency of two sounds beat at a clearly heard low frequency; one good example is flying on a twin engine propeller airplane when the engines are barely not in sync, resulting in that breeeoooaaaeeeoooaaar sort of sound.

This basic technique is sometimes used on pipe organs to obtain something resembling pedal bass stops that otherwise would need a pipe that is inconveniently long. Instead of a 16' stop, for instance, a small instrument may employ an 8' stop (2x the frequency) and--if memory serves--a 5 1/3' stop (3x the frequency) sounded together.
However, the ear is not capable of, reliably hearing any frequency below 20hz. So if you want to influence Alpha waves you need to use freqs you can reliably hear, say 100hz in one ear, and 101 in the other. The whole point of the experiment was not to induce 1 hertz waves through the air, but instead to produce them in the brain.
 
I had to look up "isochronic" because I wasn't sure it was a real word. It turns out the idea is that they're not actually making a 1Hz tone, they're playing a tone somewhere in the audible range and turning it on and off at a rate of 1Hz with the idea that will still sync your brain somehow...

So, the physics of it are fine, but the neural effectiveness is still very questionable at best.
 
10 Hz and 100 Hz would produce 110 Hz and 90 Hz resultant frequencies, not 1 Hz. (More generally, the new frequencies are the sum and difference of the originals.) There is not generally any need to isolate the sounds to accomplish that. There are plenty of examples in everyday life where miniscule differences in the frequency of two sounds beat at a clearly heard low frequency; one good example is flying on a twin engine propeller airplane when the engines are barely not in sync, resulting in that breeeoooaaaeeeoooaaar sort of sound.

This basic technique is sometimes used on pipe organs to obtain something resembling pedal bass stops that otherwise would need a pipe that is inconveniently long. Instead of a 16' stop, for instance, a small instrument may employ an 8' stop (2x the frequency) and--if memory serves--a 5 1/3' stop (3x the frequency) sounded together.

Such organ stops were usually in the pedal division with the word "resultant" part of the stop name. 32' Resultant Principal were fairly common as a cost saving. The bottom octave of a real 32' pedal stop cost as much as or more than the next 2.5 octaves. It fooled your ear/brain but probably not your trouser legs.

In electronic processing there is a device called MaxxBass, and is also available as a Waves plug-in. It works in a very similar way - using harmonics to create the impression of a sub-octave. Contrast with the dbx 500 and 120 "boom box" processors from decades back which were based around octave dividers.
 
15 Hz induces vomit. I wounder what digestive effects <10 Hz produce? Better get out the plastic bed sheets!
As for pipe organs, many use a "Speaker Stop" for the 32 foot rank. Generally, you would have to double the size of the casement to pipe it as the size of the pipes is equal to the complete size of all other ranks combined, in most cases.
And then there's the 64 foot stop....
64.jpg
 

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