BR on the serial rag devotees Birch Raw. In other words, everything that you see that makes it look different than a typical Klipschorn was done after it left the factory.
Your sub has an active and a passive woofer. They’re two completely different woofers.
Also, I don’t think your sub is quite old enough to be in the Klipsch museum which is the topic of the forum section you posted this in. 😉