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Calculating port length

Discussion in 'Subwoofer Box and Custom Fabrication' started by vincenzo, Feb 14, 2011.

  1. vincenzo

    vincenzo Full Member

    Hi everyone

    I've been doing a fair bit of searching, and I think that the correct way to measure port length, is along the red line:

    [​IMG]

    Did I get all of my red lines correct :confused:

    Oh, and I assume that if both sides of the port openings were flared, instead of just one as shown in boxes C and D, then the measuring point would not change for C or D?
     
    Last edited: Feb 16, 2011
    vincenzo, Feb 14, 2011
    #1
  2. Ranger SVO

    Ranger SVO Full Member

    Looks good to me. I do make a minor change for sharp right turns (example A), I add an extra inch.
     
    Ranger SVO, Feb 16, 2011
    #2
  3. TheViking

    TheViking Well-Known Member


    I have heard of this but never implemented it into any designs. I assume it is due to velocity and turbulance factors in the airflow.

    And ya...the redline is the right line!
     
    TheViking, Feb 16, 2011
    #3
  4. morespl

    morespl Full Member

    I'm off then

    I thought port length was the length of the actual inner piece of wood
     
    morespl, Feb 17, 2011
    #4
  5. Ranger SVO

    Ranger SVO Full Member

    For sharp turns your probably much closer to right than I am. Many professionals do NOT include any part of the length of a sharp turn (which is what your doing by only including the inside part). So I might agree with you. But for gradual turns Figures B, C and D are correct.
     
    Ranger SVO, Feb 18, 2011
    #5
  6. vincenzo

    vincenzo Full Member

    Thanks guys :D
     
    vincenzo, Feb 22, 2011
    #6
  7. caraudioking

    caraudioking Full Member

    this is correct!
     
    caraudioking, Feb 22, 2011
    #7