if done right, vented is louder, and is best for spl. Sealed takes up less space and is more punchy. but for vented boxes you can't just go out and buy a box. It will sound best building the right sized box for whatever specific speaker you are using
sealed boxes are also more accurate in sound reproduction, but once again.. as stated above, they are less efficient. The ported boxes or mostly tuned for specific frequencies for higher spl. If you want it louder and "boomier", go with ported.
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