Re: SEALED vs PORTED (basic info.)
As far as power handling, the answer as always is "It depends". It depends on the sub. It depends on the enclosure, not just sealed or ported, but tuning and volume as well. Frequency at which the power is delivered is very important as well. Below tuning, excursion increases exponentially in a vented box. Right at tuning the sub can handle a huge amount of power mechanically (in regards to excursion anyway, the stresses involved may well rip the sub apart) but just above or anywhere below tuning excursion is much higher and power handling takes a pretty big hit. A smallish sealed box will have better power handling than a larger one but will need the extra power to compensate for a drop in efficiency. Really low frequencies can damage a sub in a sealed box as well, as it takes less power to reach excursion limits when subsonic frequencies are involved.
If you really want a good idea of what the box does for power handling, get an enclosure program that does an excursion plot and play around with it a bit.
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