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 24th January 2004, 09:29 AM #1 sma   diyAudio Member   Join Date: Dec 2003 Location: jakarta enclosure port anyone can help for port specification?.I want to build subwoofer enclosure the enclosure spec is 2.50 cu ft volume,port is 25sq inch X 15" Lenght....I don't understand about 25 sq",how i can convert that to normally round diameter inch?
 24th January 2004, 09:33 AM #2 busterno1   diyAudio Member   Join Date: Mar 2003 Location: brisbane queensland you can see if this helps http://www.loudspeakers101.com/VentCal1.htm
 24th January 2004, 09:41 AM #3 sma   diyAudio Member   Join Date: Dec 2003 Location: jakarta thank you, i already try but i don't understand use this conversion.i input data,but the calculator can't process...i don't know what the mistake. is the sq inch port mean not rounded ?
 24th January 2004, 12:49 PM #4 busterno1   diyAudio Member   Join Date: Mar 2003 Location: brisbane queensland To use that calculator you need to know what freq the port will tune your box to . what dia tube is available to you to use such as plumbing pipe 3" or 4" plug them in & it will give you a length
 24th January 2004, 05:47 PM #5 Ron E   diyAudio Member     Join Date: Jun 2002 Location: USA, MN square inch is a measurement of area a circle with an area of 25 square inches is : Area=pi*diameter^2/4 rearrange: sqrt(4*Area/pi)=diameter For your area of 25 square inches, the diameter is 5.64 inches, or 14.3 cm. It is hard to make a round port a specific size, so you can scale your length, based on available port diameters. L1/L2=A1/A2, where L1, A1 are the original length and area, and L2,A2 are the new length and area... rearranging again, and Realizing that area is proportional to diameter squared, and entering your port data: L2=15*(Diameter^2/5.64^2) You input the diameter of the ports you can get, and from that you can get the new length..... __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Armaments, universal debt, and planned obsolescence--those are the three pillars of Western prosperity. —Aldous Huxley

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