calculating port length and diameter

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oxygen65

Silver - Posts: 252

Joined: August 19, 2005

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Posted: May 25, 2006 at 2:09 PM / IP Logged

ok i am building a box for 2 orion 15 h2's and the dimentions are 38wide x 25high x 30deep for a total of 14.15 cubic feet. and i want to make this box ported but i have no idea how to figure out the port diamiter or the port length, the box will be tuned to 32mhz.

stevdart

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Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: May 25, 2006 at 2:53 PM / IP Logged

https://www.the12volt.com/caraudio/boxcalcs.asp

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

luckydevil

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Joined: July 04, 2005

Location: United States

Posted: May 25, 2006 at 2:59 PM / IP Logged

Don't forget to subtract the cubic ft of the port from the box also.

stevdart

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Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: May 25, 2006 at 3:58 PM / IP Logged

...and you should have at least 1 cu ft of bracing incorporated into a box that size.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

oxygen65

Silver - Posts: 252

Joined: August 19, 2005

Location: United States

Posted: May 25, 2006 at 11:24 PM / IP Logged

yea i looked at that and tryed to put all the info in and to tune it to 32 mhz it said to have like a 7 inch port like 12 inches long,and that seems a little strange in a box that is 30 inches long

luckydevil

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Posted: May 26, 2006 at 12:42 AM / IP Logged

If I were you I would go with a slot port.

killer sonata

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Joined: May 17, 2006

Posted: May 26, 2006 at 1:37 AM / IP Logged

according to the dimensions you provided 38 x 25 x 30 = 28500 inches when you divide that by 1728 inches to calculate the cubed footage, I get 16.49 ft^3 not 14.51 ft^3. am I doing something wrong?

luckydevil

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Posted: May 26, 2006 at 1:48 AM / IP Logged

killer sonata- you aren't accounting for the 3/4" MDF.

killer sonata

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Joined: May 17, 2006

Posted: May 26, 2006 at 3:06 AM / IP Logged

oh ok. But wouldnt you want to use 1" MDF for a box that large?

luckydevil

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Joined: July 04, 2005

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Posted: May 26, 2006 at 3:33 AM / IP Logged

Personally I would, but his original figures were for 3/4" MDF.

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