Again, as already pointed out by PENG and 3db, our brains don't hear those numbers. What is on paper is one thing, how we actually perceive the sound is another.
Any measurement is only a snapshot of the overall speaker or subwoofer. There are no standards on making those measurements, so everyone measures differently. How our rooms interact with the speakers & subs is also a factor.
A lot of people claim that sealed subs are better for music. One reason they give is that sealed subs roll off gradually below the tuning frequency, whereas ported subs will drop like a rock off a cliff. You can see that on paper too.
If you ask the sub gurus like Funk, Seaton, Rythmik, SVS, HSU, etc, they will tell you that there are always trade-offs and limits. But well designed subs (like well designed speakers) will sound great.