The cables aren't active, they're cables
They are called Active Cables because they are used when the mics are assembled in that (remote) connection.
MBHO refers to the configuration as "Extended preamp with balanced capsule attachment".
Call them active cables
Schoeps "Active Collette Cables" do not contain any active(powered) components to the best of my knowledge.
(I don't think they have any passive components, either)
Schoeps people, feel free to jump in and tell me if I am missing something...