Probably a stupid question but I'm a total noob in audio/video devices. My question is, if you have a good DVD player like Panasonic S97 connected to your LCD with HDMI, then why would you ever need to add another expensive component like a Panasonic SA-XR70 receiver to it? What is the function of the receiver besides having a possibly more powerful (in terms of RMS) audio output? Does the receiver add anything to the PQ or SQ? or it is just for adding more connectivity?