Where are the ports located? Don't locate a port closerthan one diameter to a side or rear wall.


In Bassbox 5.1 (a professional program) the length for 2 x 4 inch ports is 8.4 inch (no fibre glass lined walls) Fb 25 hertz

With fibre glass lined walls and box internal dimensions that equate to 9.00 cu ft3 after subtracting bracing and any other solid objects port length is 7.20 inches x 2 4 inch port Fb 25 hertz