OK, did this box in scetchup. Trying to build ported box to Alpine specs. 1.3 cubes before sub and port. Here's where I'm confused. Owners manual says
Vent Area 11"x1" or 11" squared.
Vent Length 22"
I don't know what to make of this. I've only built a few ported boxes and have always used round ports. I don't even know what Alpine is suggesting the box to be tuned to, I'm just trying to use their specs.
Here's what I've got, can any tell me if I'm even in the ball park?