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You know, I think it’s more about the implementation than if the sub is sealed or ported. There are great examples of both. The trend is clearly toward sealed subs driven by high power amps and lots of eq.
If you want to do a ported sub that plumbs the depths it will be very big - like 5 cu ft. The WAF will be lower than the frequencies it can reproduce! That’s why most commercial subs are sealed in small enclosures. Passive radiator subs can be made very small as well, and can go very low. Size for size I don’t see a huge improvement and the cost will be higher for the passive radiator sub. You bring up a good point - it is definitely way more difficult to match any sub with ported mains. The phase/amplitude response varies with the position of the mains and is hard to predict. One sub manufacturer even tells you to stuff the ports of your mains before attempting to integrate the two.
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