Posted by Wayne Parham [ 70.234.159.49 ] on June 18, 2008 at 13:28:06:

In Reply to: lab12 posted by David Morehouse on June 17, 2008 at 23:33:07:

Most prefer to keep airspeed under 75mph, and the airspeed you've calculated is 125mph. Remember, however, that maximum airspeed is only realized at frequencies near fb, and only at high power. You can use a steep high-pass filter to reduce excursion below cutoff if necessary, but for home theater and hifi subwoofer applications, I don't think you'll need it, either for port "chuffing" or for protection against over-excursion. You can also reduce turbulence using ports with radiused ends.

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