I just hooked up my pair of Beolab 8000 to my Macbook pro, finally. Used the line in. If not connected to the computer, do I need to power them down?Pleased to hear my old pals again! I have a pair of CX 100, & 2 Beolab 3500 speakers that I would like to know what my connection options are. Both to either a IPod , Macbook Pro, and or a Harmon Kardon