Who makes quality sealed box speakers?



Hi!

Sealed box speakers seem hard to find these days. What companies are currently making quality sealed box designs?

Thanks!
lowfidelity
Bigtee, can a passive radiator design really be called sealed? I think technically it is not. But I'm sure someone will correct me if this is not correct.

supporting evidence #1

supporting evidence #2
Aroc, Vandersteen uses a very unique arrangement. That so called passive radiator is actively driven below 35hz. The 8" driver acts in a sealed enclosure. The Vandersteen is sealed and is designed for a Q of about .7.