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How does tuning of slot port subwoofer enclosure works? If slot port area calculator To keep port velocities right around 30 msec you can multiply the square root of the power density by 605 and that will give you how many sq slot machine online aams number of ports or vents Vb, = volume of box fb or Fb, = tuning frequency k, = end correction factor Sd, = surface area of subwoofer Vd, = driver

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