I owned a Powerfield sub. I don't remember it being sealed. I remember a slotted port.
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PF15, PF1500, PF18 and PF1800 were all sealed. And yes, they did add a LOT of weight to movies, but they are most definitely not fast enough to blend with Thiel's or Magnepans (I've had/tried both). For a dedicated home theater, they are a very good, and inexpensive, choice, but for music, you can find better