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Subwoofers - shouldn't they be several feet off the floor?

Discussion in 'Subwoofers' started by NicolasB, Dec 18, 2003.

  1. NicolasB

    NicolasB
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    It occurs to me that putting a subwoofer on the floor guarantees maximum excitation of floor-to-ceiling standing waves. You'd get a more linear and hence more pleasing response if the sub was a few feet off the floor.

    (I wonder, incidentally, if this is at least part of the reason why people claim dramatic results for putting subwoofers on complicated stacks of anti-vibration material and paving slabs - not just the lack of vibration, but simply the fact that it's higher up).
     
  2. Ed Selley

    Ed Selley
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    Many of us have had enough problems convincing our better halves to accept a large angry looking box in the first place- elevating it into total line of sight is asking for seperation.

    Single blokes, do let me know.
     
  3. lowrider

    lowrider
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    Subwoofers are made to work best on the floor... :rolleyes:
     
  4. MarkE19

    MarkE19
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    I'm waiting on delivery (tonight hopefully) of an Auralex Gramma isolation platform for my CHT-10. I'll let you know if it improves things once its in place.

    Mark.
     
  5. Jeff

    Jeff
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    I'm not convinced, that is simply the most practical place to put it.
     
  6. hornydragon

    hornydragon
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    Well a forum memeber recently put a Jamo sub on the ceiling!!!
    And you can make those huge tubes. even underground horns!!!
    simple idea watch a film lying on the florr and see if it sounds better!
    ( or better still get the wife to hold above her head for a few films!!!
     
  7. lowrider

    lowrider
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    Where are the woofers on floorstanders, (forget 2 ways)... :confused:
     
  8. MuFu

    MuFu
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    I'm not convinced, that is simply the most practical place to put it.

    MuFu.
     
  9. Jeff

    Jeff
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    How practical would it to build an 18" sub as a floorstander? Anyway there would be no point, the ideal height of the sub is room and location dependant. Normal sub placement is 2 dimensional, for the very best positioning you need to think in 3D.
     
  10. GaryG

    GaryG
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    I've had a number of IB configurations in two different locations in the ceiling, a twin driver sub in a plinth immediately beneath my sofa, a couple of Servo 15's in different locations around the room and an SVS style tube sub with the speaker at the top rather than the bottom (about 3ft off the floor) located next to my main speakers, (placing the driver roughly at the same height as the mid-range driver in the main speakers). I'm quite sensitive to the location of the sub and found that the response from the tube sub next to the main speakers gave me the most pleasing result.
     
  11. slingshot

    slingshot
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    I built a tube sub (looks similar to SVS) and before finishing I played about with height of the legs. And it made quite a bit of difference I tried between 3 and 8 inches (size does matter), I ended up with 3", too much higher and the bass seemed less tight and more boomy.

    Now either it need something close to fire against so that the driver would respond quicker or moving it higher affected the room modes more.

    Actually that doesn't really help at all does it ? Oh well next one I build I'll test outside and rule out the room.
     
  12. garylloyd

    garylloyd
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    In a review of servo-15, the Perfect Vision magazine did recommend rasing the sub foot off the floor.But no explanation why was given.
    Could be for this reason?
    Gary
     
  13. NicolasB

    NicolasB
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    Slingshot. I would imagine a sub that fires downwards would require something solid and close by to fire against.
     
  14. Dodgey

    Dodgey
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    I'm not single, and I can put as many speakers where I like. Guess I chose the right bird
     
  15. thackl

    thackl
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    Multiple subs can do a lot to eliminate room modes. Depending on the distance to each other (not more than half the wavelength of the upper frequency up to which yoiu want them to work) up to 8 subs (4 front, 4 back) are needed to achieve an astonishingly flat frequency response. Attached is a link to a thread on a German website. You need to scroll halfway down to see photos of how you can construct such arrays as the problem is to get them high up the wall. In this case the construction of 'shelves' makes it even look good!

    Cheers
    Tom
    http://www.areadvd.de/ubb/Forum13/HTML/006782-2.html
     

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