rear port speakers, distance to wall?

Discussion in 'Speakers' started by Shane Morales, Dec 19, 2003.

  1. Shane Morales

    Shane Morales Second Unit

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    How close to a wall can rear ported speakers (bookshelf, one port) be before it's too close? Is an inch too close?
     
  2. Greg-ST

    Greg-ST Stunt Coordinator

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    An inch is definately too close for a rear-ported speaker. It'll muffle the sound. You'd probably want it at least two feet from the wall.
     
  3. Geoff L

    Geoff L Screenwriter

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    A ~{Min of 2-1/2 to 3 times}~ in distance from any wall boundry. The measurement comes from the ~{largest active driver}~ in the rear ported speaker..

    ======>
    Largest driver x 2.5 = Min./distance
    ======>

    5-1/4"-driver = 13-1/8" from any wall/s (Min)

    6-1/2"-driver = 16-1/4" from any wall/s (Min)

    8" driver = 20" from any wall/s Min

    ETC....

    I read this in one of the high end audio mags quite some time back, when and where, don't recall..
    Certainly not a set in stone rule, but a good starting point to work from I would think.

    Moving a rear ported speaker toward a wall/boundry will help to increase the speakers lower end responce (to a certain extent), but at the cost of muddying it up eventually. This, along with clouding, and just plain trashing the midrange.

    An inch from the wall, as Greg mentioned, that would not be good....

    Regards
    Geoff
     
  4. CurtisSC

    CurtisSC Screenwriter

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    Geoff,

    I think it is 2-1/2 to 3 times the size of the port, not the driver.
     
  5. FeisalK

    FeisalK Screenwriter

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    or you could try some Golden Section settings (from Cardas Insights)

    to me, there's too many occurences of the Golden Section in nature to discount it totally [​IMG]
     
  6. Chu Gai

    Chu Gai Lead Actor

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    There are all sorts of occurrences in nature besides Fibonacci sequences:primes, exponentials, logarithmic, pi, mandelbrot, palindromics, exponentials, inverse square relationships, speed of light, avogadro's number, and so forth.
     
  7. FeisalK

    FeisalK Screenwriter

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    yes, and yet we dismiss Fibonacci sequence applications as flaky. heck we are even trying to use mandelbrot to predict the weather.
     

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