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Old 27th September 2004, 07:20 PM   #1
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Join Date: Jan 2004
Location: tennessee
Default one for the box builders

I was looking around the shop trying to find a little somthing to do.I ran across 2 mtx 12`s.Digging up the specs on the drivers
and mtx recomends 1.25 ft^3.
So after doing the math i came up with a 12x7 tube.if my math is right 3.14 x R x R x D.Never built a tube and looking for something differant to build.
What i`m wondering if anyone has ever tried a sealed tube.
thanks
donnie
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Old 28th September 2004, 02:42 AM   #2
Mikett is offline Mikett  Canada
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Join Date: Aug 2003
Location: Toronto
1. don't forget displacement of the woofer itself.
Volume is

2. you mistook D for R. R=0.5 This results in needing about 19" of tube length.

3. Since the cone displaces about 1/3 of the volume in it's depth, Add about 2" of tube length to accomodate the volume taken up by the woofer

4. Don't forget the end caps. Assuming you use 3/4" , you'll need extra .75"

Total so far is 19+2+.75=21.75"

Use 22" total tube length. ----- 7" was too good to be true!
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Old 11th October 2004, 09:19 PM   #3
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yep it was to good to be true.
i figured it all wrong oh well.......
thanks
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