Thanks. The only digital signals are the HDMI video from the Blu-ray & HD DVD straight to the Mitsubishi. Everything else is 100% Analog signal. So my audio system is 100% analog. My Left speaker is being powered by 3 amps. My Right speaker is being powered by 3 amps. And my Center speaker is being powered by 4 amps. I would like to think that all these Tri- and Quad-amping greatly improves the sound.