Box for AQ SDC 2.5 15", is this port length correct?

[mike11202 10+ year member]

^^ Picture of box on RE Calculator

How long should the port be for 36 hz? Thanks

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[Xprime4 10+ year member]

edited:can't read

 

[mike11202 10+ year member]

tell me you ain't gonna put two 15 into 4.1 ported?

its 1 15 //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

 

[mlstrass 5,000+ posts]

assuming 16^2 of port area per cube then the port should be 20" long...