Hi BR Klaus The following has taken a little while to prepare but if you look at the attachment you will find that it includes three sketches. The sketches are a bit "smudged" due to the JPG compression, but this allowed me place the 3 sketches in the one file. Sketch 1 - This is a pictorial of the 10pi, its basic crossover configuration and its relationship to the AR11. Sketch 2 - This is a sketch of the crossover components in the box. Sketch 3 - This shows the connections for the swithes us