Were passive radiators an ultimate failure? Does any speaker company still use them? A friend of mine is asking about them in regard to vintage speakers, and all I remember is being unimpressed. But I don't want to tell him that without some back-up.
The cabinet should be sealed, to avoid noise and messing up the alignment. It will, however, operate as a bass reflex system. "Sealed enclosure" indicates an Acoustic Suspension system.
Some prefer less bass from their systems. With a rear-firing port; wall proximity can become an issue as well. I used to provide a couple pieces of bonded Dacron, with my vented systems, so customers could adjust to their tastes.
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