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Around 2.3 cubes with about 37 sq” of port area tuned to 32hz. 4” wide port that yields a velocity slightly under 17 m/s. I had already told you this. Trust me dude. It’ll sound so good and loud. Or if you want more efficiency, then just incorporate a 6” flared aero port instead on the same 2.3 cubes net volume. The port area is about 9” less but the efficiency would make up for it. Less port area is needed when using aero ports. Think of it like this. What is used for optimal flow? What shape is a straw or pipe?