there are quite many discussions about pro/con sealed/vented.
you have more punch with a port, which is important for movies. Not needed for music that much. But lack of precision is mostly not as big as oftend said.
The best way to find out, which sub of both is best, is to buy them both and send one back after testing.
Then you know, if you will need the extra gauge of the port or if it annoy you while listening to music.
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