I'm just saying what the formula says. If I take the Vb and Fb for that
KappaLite 3015 Med cabinet and k=0.732, the formula says that for
two ports of 4 inch diameter, Lv=8.22 inch.
If instead I calculate for one port with the same area, i.e. a diameter of
5.66 inch, the formula says Lv=7.01 inch.
Or, if I calculate Fb for one 5.66*8.22 inch port, it would be 46.96Hz
instead of 49.42Hz. Granted, that may be too small a difference to be
noticeable in this case, but in other cases it might not.
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