I have done a bit of research on this, but I haven't really found a definitive answer. I just got a new receiver - the Yamaha RX-V475. I am trying to figure out the "optimal" set up. Right now I have my cable box (Charter), PS3, and Apple TV running directly to my TV via HDMI, then I have the TV connected to the AVR via a digital optical cable. It sounds great to me. However, I have heard that, with most TVs, the sound that gets transmitted to the AVR through optical is stereo rather than 5.1? And that it can't handle Dolby HD signals. Is that correct? I have a traditional 5.1 speaker set up, and with my current connection scheme, I'm getting sound out of all my channels and it sounds just fine. So I'm wondering, would I be better served connecting my TV to the AVR via HDMI instead? And if it is better to connect through HDMI, is it a vast difference, or rather marginal (it will be a bit of a pain to change everything over, so I want to be sure it will be worth it). Also, if I decided to connect all of my peripherals to the AVR via HDMI (pass-through?), does the AVR have to be turned on for those to work? My TV is an LG 55LM4600, if that makes a difference.