It looks like the sub10 is designed to work best with Burchardts's active speakers. As Deep_333 states, you would connect your amps pre out to the sub10's input and then connect the sub10's output to one of Buchardt's active speakers input.
Sub woofer naive question day
I am a geezer and have had decent audio equipment for better than fifty years. But have never owned a sub woofer. What is the proper way to implement the speaker into a system with an integrated amp that does not have a specific sub tap? The amp has a line out and a pre out.