I have a set of Logitech Z-5500 speakers. It appears the control pod has gone bad. It has power, but no sound from the speakers. Anyways to make a long story short Logitech has given me a code for 50% off another product. The closest they have is the Z906. I've also discovered that I can get a cable which will allow me to bypass the control pod and connect directly to the amp using the analog connections. I mainly use my htpc for watching recorded tv and ripped dvds. Am I really going to hear any difference going from using a digital connection on the Z-5500 to using an analog one?