Normal
It was about 43 - 44 L allowing for the, horn and diver volumes - I did not calculate an equivalent square port area, but he box needs to be tuned to 65 - 75 Hz depending on the driver.Doing the ports the way I did braced the box walls, in addition the port exit is a bit small but doing it this way minimized port noise. The port tuning frequency is also below the crossover point to the subs; and the port resonant frequency above the crossover frequency to the horn.
It was about 43 - 44 L allowing for the, horn and diver volumes - I did not calculate an equivalent square port area, but he box needs to be tuned to 65 - 75 Hz depending on the driver.
Doing the ports the way I did braced the box walls, in addition the port exit is a bit small but doing it this way minimized port noise. The port tuning frequency is also below the crossover point to the subs; and the port resonant frequency above the crossover frequency to the horn
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