In what way is an object suspended in mid air affected by bass notes?

Discussion in 'Home Theater Projects' started by James W. Johnson, Jul 5, 2004.

  1. James W. Johnson

    James W. Johnson Screenwriter

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    I am looking for answers to this question because I am considering making a device to suspend my CD player in mid air.
     
  2. StephenHa

    StephenHa Second Unit

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    bass compresses the air in the room more (it's a bigger wave)
     
  3. HowardLi

    HowardLi Extra

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    I don't think you could suspend something in the air using sound waves, as the compression of the air is followed by a rarefaction.

    A constant flow could do it.
     
  4. James W. Johnson

    James W. Johnson Screenwriter

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    Well I know I am a pretty crappy writer but I did not mean I was going to suspend the player with sound waves. [​IMG]
     
  5. Cam McFarland

    Cam McFarland Supporting Actor

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    LMAO...[​IMG]
     
  6. Michael R Price

    Michael R Price Screenwriter

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    Suspending the player in midair would still allow it to vibrate, but it would not transmit those vibrations to other objects ... it'd be isolated. This may or may not be a good thing. There are some acoustic isolation/decoupling products that do what midair suspension would do (but to a lesser extent) and there are some acoustic coupling devices that do the opposite. All of them claim to improve sound quality. [​IMG]
     
  7. Mark Shannon

    Mark Shannon Screenwriter

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    How are you planning on doing this James? Magnets?
     
  8. James W. Johnson

    James W. Johnson Screenwriter

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    I was thinking about something using some thin cables ...so technically it may not be totally de-coupled from the room unless I can run the cables in from outside or something.

    I had something like a plant hanger in mind.

    [​IMG]
     
  9. Seth_L

    Seth_L Screenwriter

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    And why exactly do you want to do this?
     
  10. Dustin B

    Dustin B Producer

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    Have you considered setting up a HTPC James. You could rip your music to a lossless format, store it on the harddrive and not have any skipping problems.

    Movie soundtracks would be a little more difficult. But with a highspeed DVD drive it should only take a few minutes to copy a movie to your harddrive before you watch it. Then delete it when you're done.

    As your hearing goes though, I fear for the structural integrity of your house :p)
     
  11. James W. Johnson

    James W. Johnson Screenwriter

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    I do not have my stereo blasted to 180dbs all the time. I like high SPLs but its only occationally and high SPLs in small does are perfectly safe.
    I am probably pickier than the average HTer as far as SQ goes as well so if it wont go loud cleanly then it wont go loud at all.

    Furthermore alot of the problem has to to with the fact that my rack sits in a closet that collects alot of bass , I never had this problem before moving my gear into the closet.

    Its mostly the cheaper players I have had that skip, Ive been thru around 5 players in the last few months that skipped. Currently I am using an older Sony ES player that sounds fantastic but it is really prone to skipping , probably due to its age.
    My Denon DVD-2200 is the only player that has not skipped but I do not use it for redbook CDs.

    I think I'll just go ahead and try some esoteric decoupling devices first.
    Perhaps these...
    http://cgi.audiogon.com/cgi-bin/cl.p...wek&1091458506
     
  12. Andrew Pratt

    Andrew Pratt Producer

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    James maybe try a cut up mouse pad as an isolation device first...I have small squares under all my devices as its dirt cheap and seems to work alright in stopping vibrations from my IB which is right beside the gear rack.
     
  13. ThomasW

    ThomasW Cinematographer

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    There are devices for isolating CDPs that use neodymium magnets set to repel each other. These effectively 'float' the device on a cushion of air.

    One could certainly make one of these given the good availability of neodymium magnets. Or one has a spare $350, one can buy them. GR-Research offers one called "The Levitator", other places offer them under different names.

    [​IMG]
     
  14. Pus Suchre

    Pus Suchre Stunt Coordinator

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    Now "The Levitator" is just cool. I have no need for one at all- but if I had a spare $300 I'd buy it- because it really is cool [​IMG]
     
  15. Brett DiMichele

    Brett DiMichele Producer

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    the problem with the levitator like all non semiconductor
    based floating (or any other magnetic device) is that the
    magnets do not balance the device and there is still a
    physical coupling between the base and floating upper
    section (see the aluminum posts? those keep it centered).

    I worked on something like this myself and I gave up after
    I was unable to get the magnets to balance themselves out
    via polar orientation.

    To me, having centering pegs just goes against the whole
    idea behind the device.
     
  16. Chris Keen

    Chris Keen Stunt Coordinator

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    What if....

    The balancers were not aluminum posts, but instead were fishing line? Perhaps there would be a need for more than two "posts" but still. Go back and experiment Brett, tell us how it goes.

    [​IMG]
     

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