To follow on, a ported design is more efficient because the driver is not: a) fighting a sealed air mass to achieve its excursion, b) more efficiently coupling with the air in your room. For a given level of power you will get more loudness and/or extension out of a ported design.

On the other hand, the sealed mass acts as a natural damper and you don't have to worry about a rumble filter to keep the driver from unloading at tuning.

Fred

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Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!