Hello, I have something to install in the subwoofer box at the back right of the case room, the question is of course what is possible. both in the loud speaker boxes in the case room as well as in the subwoofer box there are no speakers installed….in the loud speaker boxes in the case room, however, there are cables laid. Have there successfully installed speakers. But what about the subwoofer box…How do I get the cables installed there at all? For what is this supposed to be. Have read there two sockets for 13cm speakers??? subwoofer installation is not possible??? should I take a subwoofer, first install an end stage, I still need a connection from the battery..is the one already installed…. Do I need an active subwoofer, i.e. subwoofer with built-in end stage, also an extra connection from the battery?