Originally Posted by Vesper
Side question related to lag: I understand how it impacts gaming, but how about audio-sync? Display lag means the picture will be behind the audio signal, which the receiver likely will be processing/broadcasting before the picture. Now, maybe this is a wash due to speed of light vs. speed of sound, but I'm curious how this plays out. Obviously receivers have delay settings to allow all channels to reach you at the same time, but has anyone ever upped these settings to accommodate display lag?
input lag can cause lip sync issues, most notably if your not using the HDMI audio stream coming from the TV, like if you have HDMI plugged directly into the TV and then use Optical digital audio out to a A/V Receiver like I do
if the audio is coming out of the TV or is being fed from the TV to the Receiver the TV SHOULD compensate for the delay, but this is not always the case
newer HDMI receivers have sound delay to correct this problem as well
also as long as the input lag is fairly small its not really an issue, Before i got my Sony 32xbr6 I had a crappy Insignia 32" It had horrible input lag I never tested it at the time because I didnt really know about the problem but i seen it with PC use big time with the mouse and also saw lip sync issues with ANYTHING except for the TV's tuner, this included routing sound though the TV first then to a Receiver!!
now my sony 32xbr6 I have tested for input lag, I thought it was lag free beforehand but it is not, in video modes on any HD input its around 40ms in game mode drops it to about 30ms and SD inputs (svideo was tested) in game mode 40-50 ms never tested svideo out of game mode but its prolly about 10 ms higher.
now i have my PC, PS3 and xb360 plugged into my Receiver directly via optical so I can get DD and DTS sound from movies, and my SD cable box is connected to the TV (composite video, analog audio its a crap STB) and I never see lip sync issues on any input, I think the cable box plugged into composite would be the most likely to cause lip sync issues due to this being the highest lag input on the TV but because i route the sound through my TV then into my Receiver the TV is most likely delaying the sound to compensate for the lag and on other inputs the TV is lag free enough for it to be a non issue