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Hard to get good pics of a wall inside the car lol

Not yet, the latest prototype just came in. We need to finish testing and magically come up with the funding to put a respectable production run in. Dcon is getting some nice upgrades.

If you have a 4" aeroport, the area is the area of a 4" circle. If it's a 6" port, the area is that of a 6" circle. The flares on the end don't count for port area. However, you actually did write a correct question, and that is the "effective" port area of an aeroport. Not the actual port area, which some of these other guys apparently thought you asked. Generally, you only need 50-75% of the port area when using aeroports. So if a box and sub would need 100 sq. inches if using a slot port, you should be able to get away with 50-75 sq. inches with aeroports. That helps keep port length, and thus port volume, down so that you don't need as large of an enclosure in net size. But also, they don't "trick" the sub into thinking anything, they just allow for smoother airflow in and out of the port, which reduces the chance for port noise. Port noise is one of the main reasons subs need the port area that they do.