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  #1  
Old 08-28-2011, 01:39 PM
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Default What's my box tuned to?

I designed my box using the RE Calculator and it says that my box is going to be tuned to 35hz. But when I put the same dimensions and everything into Torres it says that my box is going to be tuned to 40hz.



Here are the specs:
Width - 32"
Height - 13.5"
Depth - 20"
Port Height - 12"
Port Width - 3.5"
Port Length - 15.75"

This is for two 12" subs so I'm estimating around .2 displacement for both.

I plan on gluing the box when I get home from work tonight and if I had to it would be easy for me to cut some more wood to make the port longer.

Anyone know what my box is going to be tuned to or why the calculators are giving me different information?
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Last edited by nicholask1993; 08-28-2011 at 01:44 PM.
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Old 08-28-2011, 01:51 PM
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if your using 3/4 board i got

3.9 gross
- .5 port
- .2 sub

with a final figure of 3.2 cubes tuned to 41hz,
if you want 35 hz you need a 23.5" long slot

i didnt double check my figures, but im kinda new to this too, so im just getting my feet wet lol i could be wrong
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Old 08-28-2011, 02:01 PM
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good looking box tho, are you gonna throw in sum 45's in the corners,
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Old 08-28-2011, 02:26 PM
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I might throw some small 45's in the corners since I have some extra MDF that is the perfect width and won't take up too much airspace.

So if I add 7.75" of port I'll be tuned where I want to be an it will bring my airspace to 3Ft3, exactly what I was shooting for.
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Old 08-28-2011, 03:20 PM
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Ugh.. 20-1.5-15.75=2.75. Is the distance between your port piece and the back wall < 3.5"? Normally you want it to be the same distance as the rest of your port, and it would effectively extend the port to be as long as the box is deep. I.e. If your port piece was 15" long that would leave a 3.5" opening behind the port to the rear wall. This would effectively create a small turn like an L port (with no 2nd physical extension) that would make it the same length as the box depth.. 20 inches.

Then youd have your ~3.2cube box with a 20" long port and 42square inches of port giving you a tuning of ~37hz according to The12Volt.com
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Old 08-28-2011, 03:23 PM
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^^ yeah thanx to 12.volt^^ thats where i got the info at, ther calculater is pretty accurate
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Old 08-28-2011, 04:02 PM
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Quote:
Originally Posted by surreal View Post
Ugh.. 20-1.5-15.75=2.75. Is the distance between your port piece and the back wall < 3.5"? Normally you want it to be the same distance as the rest of your port, and it would effectively extend the port to be as long as the box is deep. I.e. If your port piece was 15" long that would leave a 3.5" opening behind the port to the rear wall. This would effectively create a small turn like an L port (with no 2nd physical extension) that would make it the same length as the box depth.. 20 inches.

Then youd have your ~3.2cube box with a 20" long port and 42square inches of port giving you a tuning of ~37hz according to The12Volt.com
Thanks for the explanation. My port wall is 15" not 15.75" as I said earlier. So if I were to add say a 3" piece to make an actual "L Turn" my port length would be 23" correct?

Also when using the calculator on the12volt I use the volume after sub displacement and don't account for port volume right?

This is my first time building/designing a box... :/
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Last edited by nicholask1993; 08-28-2011 at 04:08 PM.
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