The Cambridge Soundworks speakers only support Coax digital input. The microsoft vga adapter only includes an optical output for digital, but it does include analog stereo outputs which you can use to connect to your speakers. There are red and white rca plugs you can use to connect to external speakers or a reciever. It also includes an adapter to convert the left and right rca plugs to a stereo mini plug. (suitable for plugging into your speakers) you may want to pick up a stereo rca extension cable (male on one side female on the other), as the rca plugs are integrated into the vga cable and will end up at the back of your monitor.