Its for the JBL 2225H. The two ports I am using - is 3" wide each, and 5.67" long each. Its a PiAligned cabinet, so Vb is 47L and Fb is 53Hz. I have 3" distance from each wall which is port diameter - except from back wall to back of port.

The depth of the cabinet is just 9.5" - and the port is 5.67" long, so thats 3.83" distance. It will have highpass filter, approximately 80 to 100Hz. And I've designed for about 400W maximum power input, but it wont be used like that all the time of course. Do you think this is enough distance?

Thanks!
Adrian