square port calculator

if possible can someone give me a square port calculator, or even tell me how to calculate from round port to square port. thanx xTimx

 NOTES ON CALCULATING PORTS

SURFACE AREA OF PORT

To get the square inches of a ports surface area you multiply 3.14 times circumference of the port. IE (4¡±)

If you have multiple ports you then multiply the results by the number of ports that you have. So if you have (2) 4¡± ports then you calculate as follows

3.14 X 4 = 12.56  12.56 X 2 = 25.133   25.133 Is the surface area of the two ports now combined

four is the size of port 12.56 is the surface area of one port the X 2 means that you have 2 ports and 25.133 is the total volume of both ports.

HOW TO CONVERT A CIRCULAR PORT TO A SQUARE PORT

If you want to use square ports, use a port whose height multiplied by its width equals the 'port area the port length will be the same as the round port.

Let¡¯s say you want to convert a 4¡± port which is 14.5 in long to a square port. Multiply 3.14 X 4 = 12.56 now calculate what times what would = 12.56 or 12.5 2 X 6.25 =12.56 so you have a port that is 2 X 6 ¨ù X 14.5 long  Or if you have 25 sq/in of surface area and a length of 14.5  you calculate:  25 % by 2 =12.5 so you have 2 X 12.5 X 14.5 long.

A good site with a port calculator is http://www.eatel.net/~amptech/syndicate/spboxnew2syndicate.htm

Which is  Basic Car Audio Electronics

If you give me your email I will send you a copy with the correct characters

if you try out a program like WinISD it will cal. for you     it is freeware and can be easily be found on the net2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR

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2007 World Record

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actually i found another good site for square port calc. here it is......http://www.loudspeakers101.com/VentCal1.htm