[Mike P.]

Using WinISD, port air speed with 600 watts input would be 21 m/s at 20 hz, 29 m/s at 15 hz and peaks at 33 m/s at 11 hz. The port dimensions are wide and narrow, not the best for air flow. Changing the dimensions to 3" by 9" by 27" long would be a better choice. It will help with air flow and has a slightly larger surface area to reduce air speed.

 

[Mike P.]

If you're doing a slot port make sure you round over the edges. Take pics of the build and post them. :T

 

[Mike P.]

Glad that you are happy with them. What was the net volume of the cabinet?

 

[Mike P.]

Looking good!