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For this to work in a 12 inch sonotube you would either fold the port or let it stick out above the sonotube like a stove pipe. In 2.5.cu ft tuned to 18 hz, with 500 watts input power and a HPF at 16 hz, port air speed would be 30 m/s at 17.5 hz with a 4 inch flared port 38.75 inches long.

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