Could I port a Tempest in 24x24x24"

Discussion in 'Home Theater Projects' started by Mark Fitzsimmons, May 10, 2003.

  1. Mark Fitzsimmons

    Mark Fitzsimmons Supporting Actor

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    Right now my tempest is in a 21.5" cube sealed.

    I think the largest volume I am going to be able to get away with is a 24" cube.

    If I create a new enclosure, could I vent it? Or is the volume still unsufficient?
     
  2. Dustin B

    Dustin B Producer

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    With some stuffing you'll should get about 165L net out of that. You could get a single 4" flared port in there. Would be pretty close to that 170L design DanW suggested a while ago.
     
  3. Mark Fitzsimmons

    Mark Fitzsimmons Supporting Actor

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    I thought stuffing of a vented enclosure was a no-no? [​IMG]

    And rather you just kind of lined the walls. . .
     
  4. MichaelAngelo

    MichaelAngelo Stunt Coordinator

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    Consider a slot port.
     
  5. Mark Fitzsimmons

    Mark Fitzsimmons Supporting Actor

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    Isn't one 4" port a little small for a Tempest?

    Out of the three reference designs for the tempest two of them use twin 3" ports and one uses two 4" ports.

    I took some measurements and think I can handle a 24" x 24" x 28" enclosure (exterior dimensions)

    Assuming 3/4" MDF this gives us 220 liters of internal volume. Not accounting for volume losses for driver, bracing, and port displacement.

    Think in the end we may be around 190-200 liters?
     
  6. Dustin B

    Dustin B Producer

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    You can't densely stuff a ported enclousre, but you can stuff it a little to get some appearent volume increase. SVSubs do this.

    If you can get the net volume to a little over 200L a 20hz tune with a 6" port becomes possible.

    You won't be able to realize the full potential of a Tempest with a 4" port, but it will still work.
     
  7. Robert_CA

    Robert_CA Stunt Coordinator

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    Mark,
     
  8. Robert_CA

    Robert_CA Stunt Coordinator

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    Mark, I just finished my 214L Tempest last Friday using similar dimensions (mine is 26.5x24x24)and used the twin porting recommended in the Adrie application paper. I couldn't be more pleased with the result. I watched Attack of the Clones Saturday and in the opening scene when Princess Amadala's ship flew by, it scared the snot out of me! I could really FEEL the bass that the Tempest produced in my 22 x17 room. Independence Day is on tap for tonight!!
     
  9. Mark Fitzsimmons

    Mark Fitzsimmons Supporting Actor

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    Robert,

    Those are dual 3" ports right? Do you hear any port noise?
     
  10. Robert_CA

    Robert_CA Stunt Coordinator

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    Yes they are and I haven't detected any noise from them during testing. I've driven the Tempest moderately hard on a couple of occasions and it has performed above my expectations.[​IMG]
     
  11. Justin Ward

    Justin Ward Supporting Actor

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    My 24 x 24 x 30 SBB$ Tempest is ported with two 3 inch PVC ports. There is port noise when test tones are played but I've never noticed it during a movie.
     

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