Making a test box

Discussion in 'Home Theater Projects' started by Mark gas, Dec 2, 2004.

  1. Mark gas

    Mark gas Second Unit

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    I am making a box for 6.5 inch drivers that will be adjustable so I can change the air space inside the box. What’s the maximum air space a 6.5 inch driver will need? 1 cubic feet enough or should I go 2 cubic feet?
     
  2. GrahamT

    GrahamT Supporting Actor

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    The Vb depends on the driver and the desired Q. In general, 1 cu ft is plenty for a 6.5" driver but more info is needed. Why do you need to vary the Vb?
     
  3. Mark gas

    Mark gas Second Unit

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    I want to try out a buch of driver that I have and see what box size suits them the best.
     
  4. Greg Monfort

    Greg Monfort Supporting Actor

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    If you know its Vas, then 4*Vas is 'close enough' to a sealed IB, i.e. Qtc = ~Qts, whatever it is. If not, then just doing a quick search, the highest Vas I found for a 6.5" is 1.14ft^3, so I guess you can't go wrong with ~4.56ft^3.

    GM
     
  5. GrahamT

    GrahamT Supporting Actor

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    You can model the in box response in winISD and other programs if you have the TS parameters.
     
  6. Mark gas

    Mark gas Second Unit

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    yes but once I do I have to build a box for them. This way i can use winisd for box size throw the driver in the test box with a tweet and use a active xover and give a listen and then try another driver within minutes. 4 cubes might be a little to big for space wise so i might go for 2 cubes.
     
  7. Wayne A. Pflughaupt

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    No need to make the wall movable. You could build the box the biggest size you think you would ever need it, then cut several 1/4 cu. ft. styrofoam blocks. All you would have to do is drop enough blocks inside the box to reduce the airspace by the amount you want.

    Regards,
    Wayne A. Pflughaupt
     
  8. Mark gas

    Mark gas Second Unit

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    thanx for the tip
     

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