can anyone design this box

[Henline2205 10+ year member]

Ported for an fi 18' btl h=max of 21 in. w= max of 39in. d=25-35.. i dont know much about how big the port should be, so could someone just draw me up a sketch and give me some idea how it should look.. i would also like to have a 55 degree angle on the back of the box if it is possible if not that is ok too.. this is my first box that i am building so i really need this sketch to help me out.. thanks

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[SHiZNiLTi 10+ year member]

Ported for an fi 18' btl h=max of 21 in. w= max of 39in. d=25-35.. i dont know much about how big the port should be, so could someone just draw me up a sketch and give me some idea how it should look.. i would also like to have a 55 degree angle on the back of the box if it is possible if not that is ok too.. this is my first box that i am building so i really need this sketch to help me out.. thanks

Why another thread about the same thing?

Video of 18 BTL in the below box:



7cuft @ 32hz with 100sq.in. of port. Below is the link to the build of it. Double baffle w/ dowels top to bottom, rounded port with cut 45 in back of port...

http://www.caraudio.com/forum/showpost.php?p=2673699&postcount=1

19" tall x 37" wide x 27" deep The port is 5.75" wide x 17.5" tall...

I'll eventually scan in the cutsheet I have drawn out.