To connect the complete Logitech system to the receiver you will need to use 3 stereo speaker to line level converters. Connect one to the front speaker terminals. Connect one to the surround speaker terminals. Connect half of the last one to the center speaker terminals. Since the receiver already has a line level output for the subwoofer you now have a 5.1 channel analog input for the Logitech 5.1 input. You will need 3 cables each with 2 RCA plugs at the receiver end and 3.5mm stereo plugs at the speaker end.