Ports and 'Stuff'...

Discussion in 'Home Theater Projects' started by Adam O, Aug 9, 2003.

  1. Adam O

    Adam O Stunt Coordinator

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    I was wondering if you have the diameter and length of the port determined for a given volume, do these numbers need to be recalculated if stuffing is placed in the box, as the stuffing would effectively increase the volume in the box???

    If this is true how does one go about determining the volume increased based on the mass of the stuff placed in the box?

    For example:

    Start with a 215L Box with 2 Dayton 15" DVC subs.

    To tune the box to 18Hz one would need 2 4" X 24" Ports.

    If one were to add x g of fill what change to the length of the ports would be needed to maintain an 18HZ tuning frequency??

    Thanks alot,

    adam
     
  2. Jake K

    Jake K Stunt Coordinator

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    I don't think polyfill works the same way in a vented enclosure, but I'm not really sure.
     
  3. Pete Mazz

    Pete Mazz Supporting Actor

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    The polyfill would affect the apparant volume of the box, just as it would in a sealed enclosure. You'd need to keep the polyfill away from the internal opening of the vent, tho. You would also have to guestimate the volume increase and shorten the port accordingly, as larger enclosures require shorter port lengths for the same tuning.

    Pete
     

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