Originally Posted by TJElite

OK, what are the specs of the ported box? what size sealed box? Any particular woofer?

I'll take a couple of liberties in the meantime. Here is a Crossfire BMF1028, 10" woofer in a sealed 1 cu ft box vs. a 1 cu. ft box tuned to 35 hz. The orange is the ported response, the red is sealed.

At 27hz, the sealed box is approx. 0.5 db louder than the ported. You can also see how the ported box rolls off at approx. 12db per octave from 50 hz, while the sealed rolls off at a shallower 6 db per octave.

Since these are arbitrary designs for an arbtrary woofer, I don't know how this pertains to the original question. But you asked for it.

Toby