Would two 2-1/2" ports work for my Titanic ...

Discussion in 'Home Theater Projects' started by Jason Hammerly, Dec 12, 2003.

  1. Jason Hammerly

    Jason Hammerly Supporting Actor

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    I have a 12" Titanic MK II and was using winisd to come up with a box design. I came up with a 142.5 L enclosure with a tune of 20 hz. With 2 ports of 2-1/2" and a length of 11.06" I have a mach of .08. Is there anything I should worry about going this route? I have this 2-1/2" PVC laying around from a project and figured I could use it rather than buying one 4" flared port. I could even go with 3 ports 17.5" long from the 2-1/2" PVC. Any opinions on this one? thanks

    Jason
     
  2. Jason Hammerly

    Jason Hammerly Supporting Actor

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    Any advice for me guys?? thanks
     
  3. Kyle Richardson

    Kyle Richardson Screenwriter

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    That size enclosure would work with the Titanic MkII just fine for an EBS alignment. 2 of the 2.5" ports will be fine as well but I'd round the MDF at the port opening to create a flare to reduce wind turbulance. Other than that you are good to go!
     
  4. Jason Hammerly

    Jason Hammerly Supporting Actor

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    cool ... thanks.
     
  5. Mike Keith

    Mike Keith Second Unit

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    That seem a little high, I don't know about the units of measure you are useing .08 mach? how did you get this number. WinISD only shows MPH f/s m/s, I'm used to the m/s and and as far as my calculations go .08 mach is about 26.4 m/s which is too high you need to be around 18m/s or lower.
     
  6. Kyle Richardson

    Kyle Richardson Screenwriter

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    If the vent edges are rounded he shouldnt hear any audible chuffing except for the possiblity of sine waves in the 20Hz area. For regular listening material he should probably be fine.
     
  7. John_MackieBass

    John_MackieBass Stunt Coordinator

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    If the ports are not front firing that should help eliminate the port noise as well.
     
  8. Jason Hammerly

    Jason Hammerly Supporting Actor

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    would I be better off with rear firing rather than front firing?
     

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