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Unibox help???

Discussion in 'Archived Threads 2001-2004' started by JimHal, Jan 3, 2002.

  1. JimHal

    JimHal Stunt Coordinator

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    What exactly is the "Port End Correction" field for a Vented Box.

    I have chosen a 5" port with two flush ends. It resuls in .85 in this field.

    Is this value .85 inches, cenitmeters, or something else?
     
  2. Jack Gilvey

    Jack Gilvey Producer

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  3. JimHal

    JimHal Stunt Coordinator

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    So the "Port Lenght" field will be the actual cut length of the port, right?

    Thanks for the help.
     
  4. JimHal

    JimHal Stunt Coordinator

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    Yippee. Almost time to cut.
     
  5. JimHal

    JimHal Stunt Coordinator

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    Another question: This one about F3.

    I have a Dayton 12" DVC, I was planning on a 120L enclosure, a 5" port tuned to about 18.5Hz resulting in a length of 76.88cm. This will give an F3 of 20.57.

    Would I be better off tuning to 20Hz to lower the F3 to 19.67Hz? Will this difference even be audible without an SPL meter?

    I am wanting a sub the will be good for mostly movies.
     
  6. Brian Bunge

    Brian Bunge Producer

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    Jack,

    It's nice to know I wasn't the only one with Unibox questions!

    Brian
     
  7. JimHal

    JimHal Stunt Coordinator

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    Great, thanks Jack.

    I'm planning on using a tube. I originally wanted to build a box but it is just way too big.

    Thanks again for your help.
     
  8. Brian Bunge

    Brian Bunge Producer

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    BTW, you can drop the DVC 12 into the Shiva EBS box (142.5L with 20Hz tuning) and use the standard 4" dual flared port from PE as well. Unibox gives a port length of 37.19cm or 14.64". You get 108dB at 19Hz and 110dB all the way out to 80Hz or so, anechoic of course.

    I just placed an order. Both the driver and port are on backorder.

    Brian
     

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