I recently upgraded to a DLP and am having trouble with sound sync from various sources, but I will just focus on the DVD player. I am using a Logitech z-5500 system. No matter which input on the logitech I use to receive sound (digital or analog), the sound is early by a split-second. Just for troubleshooting, I connected the coax output from the player to the logitech, and the analog R/L outputs from the player to the TV itself at the same time. I play a DVD, and you can hear the two sets of sound being out of sync with each other. So, there is some sync issue with using the logitech but it is ok when going directly to the TV's speakers.
Just to make sure I'm not going crazy, I hooked everything back up to an older analog CRT and everything is fine there. The two sets of sound are in sync with each other.
I'm having trouble figuring out where the problem lies, with the TV or with the logitech system. Is the TV causing some sort of lag? If so any ideas on what I can do?