Miscalculation in sub box, what now??

Discussion in 'Home Theater Projects' started by BryanDO, Oct 9, 2006.

  1. BryanDO

    BryanDO Stunt Coordinator

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    I just finished my sealed shiva box and noticed while building I made the box a little smaller than what i was intending. I was going for a 2.4cu ft box but ended up with 2cu ft and a qtc of .747. I was aiming for an even response of .707. Now I plan on adding some polyfill to help make up for the difference. Thing is how much to I add? I was thinking 2 lbs but I'm not sure. What's the formula for adding fill and how much volume will I gain with how much fill?

    Thanks alot,
    Bryan
     
  2. Brent_S

    Brent_S Second Unit

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    You should be fine, especially with the 2 lbs of fill. The room and driver manufacturing tolerances will probalby make more difference than your .04 predicted Qtc difference.

    There's a thread on fill material and density going on right now at either AVS or HTGuide...can't remember which. Test results (Nousaine?) showed as much as a 40% volume difference with the right amount of fill, but beyond a point, you actually start decreasing apparent volume.

    -Brent
     

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