how long of a port

[trigger2008 10+ year member]

I am going to put 2 15's in a 8.9 cubic ft box(all the room I have) ported at 30htz I am using a slot port 14.75 by 7 and 22.85 long is this right and if not let me know what size port I should use my slot port has to be 14.75 high.

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[Acidburn 5,000+ posts]

Where Av is the cross-sectional area of the port (in square inches),

Lv is the length of the port (in inches)

and Vb is the enlcosure's net volume (in cubic inches). use that formula, its from http://www.jlaudio.com/tutorials/ports/index.html oh and don't forget the correction factor for a slot port