Is it true that the power handle of a sub in a correctly built ported box (above the port tuning frequency) will handle more power than a sealed enclosure above these same frequencies for the same sub (lets just say 22hz tunning frequency for giggles)???
Actually, both thermal and mechanical power handling is higher with a ported box. The reason ported is recommended when using lower power is simply because it is more efficient. At any point above tuning, a ported box will have more cone control than a sealed box, equalling less excursion and also having less distortion than a sealed box. The tuned frequency is the point of highest mechanical power handling, and excursion is kept to a minimum even though SPL rises at that frequency. That's the reason SPL competitors apply 10,000+ watts to a sub at tuning and get tons of SPL, with a sealed box and that much power you'd blow the cones straight out of the subs. Thermal power handling is higher with a ported box, too, since air is allowed to move in and out of the box, it helps keep the voice coil cooler.