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  1. #1

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    Default Subwoofer capable of 19Hz tone...

    I am looking for a subwoofer for a specific purpose for an experiment.

    It needs to be able to reproduce (cleanly) a continuous 19Hz tone at a faily good level. 100Watts or higher RMS.

    The problem is that frequency is below what I can hear. Presumably it is below what any of us can hear, so I can't simply listen to it and see if it's doing what it should be.

    Given the experts on this forum, I thought that someone might be able to suggest a speaker that would be up for this task.

    I don't care about ANY other specs for my purposes. Only that particular frequency.

    Obviously, I would like to find the most cost-effective alternative that does the job well.

    Thank you for your help.

  2. #2

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    Welcome to the forums.

    What is your budget? Also, what is the reason for needed to play only that one frequency?
    polkaudio RTi10 bi-amped at 300 WPC
    polkaudio CSi5
    polkaudio FXi3
    Velodyne CHT-12
    harman/kardon AVR-254
    harman/kardon FL-8385
    Emotiva UPA-7

  3. #3

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    Default Budget, etc

    My budget is 2 to 3 hundred dollars, maybe a bit more if need be.

    The experiments are on infrasound effects on animals VS humans.

  4. #4

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    Welcome Bob.
    What SPL do you need to reach at that frequency?
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben

  5. #5

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    I'm not entirely sure. Something equiviant to a fairly loud sound if it were audible. Something like 90 - 95 decebles.

    I know the average stereo is played louder than that, but at that level it should be percieved above background noise levels.

  6. #6

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    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche

  7. #7

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    That's a good recamandation.
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben

  8. #8

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    Are you going to be playing those at anechoic chamber or concrete basement? Bass that low will make audible noises if played in places where there are objects that move. On regular wood framed room it will create quite a lot of things you can either hear or feel.

  9. #9

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    Quote Originally Posted by AudioBob View Post
    The experiments are on infrasound effects on animals VS humans.

    This sounds interesting. Can you say more about it?

  10. #10

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    Certain frequencies below the hearing range of people tend to have fairly consistant results, causing uneasiness, anxiety, etc. Other frequencies have different effects.

    We are testing to see if these are universal qualities, or if they just apply to humans.

    We haven't actually started testing yet, we need to have the apparatus capable of reproducing the sound and a reliable method of testing to see if it is working because we will not be able to hear it.

  11. #11

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    you should give danley sound labs a call and ask to speak to tom danley :D

    this is one of his creation

    http://www.danleysoundlabs.com/matterhorn.htm

    my 7.(1x4) HT setup
    TV - Mitsubishi WD-65734
    AVP / Amp - Onkyo PR-SC885P / D-Sonic 2500-7
    Front - Emerald Physics CS2
    Center - JTR Triple 12LF
    Surround L/R / Back - Polk RTi4 / Polk FXi A4
    Sub - 4 X Hsu ULS15 playing nearfield
    DVD / CDP - Sony PS3/40GB / Sony SCD-XA9000ES
    Belkin PURE AV PF60 / UPS
    Buttkicker

    http://www.polkaudio.com/forums/showthread.php?t=60612

  12. #12

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    Wow, what does that thing do?

    I was looking at the elemental designs link. That looks pretty good.

    I will also give Danley Sound Labs a call.

    Thanks!

  13. #13

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    iirc, it was built for the same application you asked for...for the military
    my 7.(1x4) HT setup
    TV - Mitsubishi WD-65734
    AVP / Amp - Onkyo PR-SC885P / D-Sonic 2500-7
    Front - Emerald Physics CS2
    Center - JTR Triple 12LF
    Surround L/R / Back - Polk RTi4 / Polk FXi A4
    Sub - 4 X Hsu ULS15 playing nearfield
    DVD / CDP - Sony PS3/40GB / Sony SCD-XA9000ES
    Belkin PURE AV PF60 / UPS
    Buttkicker

    http://www.polkaudio.com/forums/showthread.php?t=60612

  14. #14

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    A sound outside the spectrum audible to humans can be observed by using a microphone connected to an oscilloscope. You can observe amplitude and frequency (and the presence of unwanted infrasonic sounds).
    Last edited by b_dick; 09-14-2008 at 07:38 PM.

  15. #15

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    A sound outside the spectrum audible to humans can be observed by using a microphone connected to an oscilloscope.

  16. #16

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    Talking

    Quote Originally Posted by AudioBob View Post
    Certain frequencies below the hearing range of people tend to have fairly consistant results, causing uneasiness, anxiety, etc. Other frequencies have different effects.

    We are testing to see if these are universal qualities, or if they just apply to humans.

    We haven't actually started testing yet, we need to have the apparatus capable of reproducing the sound and a reliable method of testing to see if it is working because we will not be able to hear it.
    LOL ... I suppose we all have our different hobbies :D I prefer to experiement to see if I can piss off my neighbors with my speakers and subwoofer ... so far it has produced fairly consistent results (them calling the cops) and generally causes them uneasiness and anxiety when I blast my music at 3:00 am on a Tuesday, I think their dog has similar feelings of uneasiness and anxiety ;) Im pulling your leg of course.

    Just make sure what ever sub manufactuer you end up going with that you tell them that they can no longer label their boxes with "No animals were harmed or annoyed in the manufacturing or testing of this Subwoofer" :D

    Good luck.

    Zsolt

  17. #17

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    Quote Originally Posted by AudioBob View Post
    Wow, what does that thing do?

    I was looking at the elemental designs link. That looks pretty good.

    I will also give Danley Sound Labs a call.

    Thanks!
    did you call danley? :)
    my 7.(1x4) HT setup
    TV - Mitsubishi WD-65734
    AVP / Amp - Onkyo PR-SC885P / D-Sonic 2500-7
    Front - Emerald Physics CS2
    Center - JTR Triple 12LF
    Surround L/R / Back - Polk RTi4 / Polk FXi A4
    Sub - 4 X Hsu ULS15 playing nearfield
    DVD / CDP - Sony PS3/40GB / Sony SCD-XA9000ES
    Belkin PURE AV PF60 / UPS
    Buttkicker

    http://www.polkaudio.com/forums/showthread.php?t=60612

  18. #18

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    Default

    Not yet. I am planning to today or tomorrow. I have been backed up with other work.

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