Precision Power PRO15 - Manual (Page 9)

Ported speaker diagram
PORTED ENCLOSURE
Internal dimensions should be calculated to determine the correct enclosure
volume. Be sure to allow for speaker displacement, extra bracing (if used),
and port displacement (only the length of the port that is INSIDE the
enclosure). It may be necessary to angle the port to fit your design. To
calculate the displacement of the port:
(Outside) Radius
2
x 3.14 x Length of the port that is inside the enclosure.
7
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