0.75Hz

Discussion in 'Question of the Day' started by dvsDave, Sep 30, 2019.

  1. dvsDave

    dvsDave Benevolent Dictator Administrator Senior Team CB Mods Fight Leukemia

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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
     
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  2. EdSavoie

    EdSavoie Well-Known Member

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    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?
     
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  3. dvsDave

    dvsDave Benevolent Dictator Administrator Senior Team CB Mods Fight Leukemia

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    No idea, it's on Kickstarter as the Banala Lite.
     
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  4. JonCarter

    JonCarter Well-Known Member

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  5. rsmentele

    rsmentele Well-Known Member Premium Member Fight Leukemia

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  6. gafftaper

    gafftaper Senior Team Senior Team Fight Leukemia

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    That's easy to solve. It just pushes the 112' wave out of the 3" driver in a straight line. :think:
     
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  7. MNicolai

    MNicolai Well-Known Member Fight Leukemia

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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.

    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.
     
    Last edited: Oct 2, 2019
  8. dvsDave

    dvsDave Benevolent Dictator Administrator Senior Team CB Mods Fight Leukemia

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    You win the internet today
     
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  9. Michael K

    Michael K Active Member

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    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?
     
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  10. RonHebbard

    RonHebbard Well-Known Member Premium Member

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  11. TimMc

    TimMc Well-Known Member

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  12. RonHebbard

    RonHebbard Well-Known Member Premium Member

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  13. gafftaper

    gafftaper Senior Team Senior Team Fight Leukemia

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    BOOO!!!!
     
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  14. Van

    Van CBMod CB Mods Premium Member

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  15. DrewE

    DrewE Well-Known Member

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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.
     
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  16. RonHebbard

    RonHebbard Well-Known Member Premium Member

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  17. Van

    Van CBMod CB Mods Premium Member

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  18. Malabaristo

    Malabaristo Well-Known Member

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    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.
     
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  19. TimMc

    TimMc Well-Known Member

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  20. JD

    JD Well-Known Member

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    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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