I have the following equipment: Windows Media Center Marantz NR1602 Panasonic VT30 (50 inch) I have enabled auto lip sync on the amp, and I have set the audio delay to 0ms on the audio delay menu of the amp. Depending on the material I play, I get varying levels of video delay, meaning I have to adjust the audio delay every time I watch something different. Surely the point of auto lip sync is that this should be taken care of for me and I shouldn't need to be constantly adjusting the delay? I have ruled out the media centre and the content as being to blame by plugging the media centre directly into the TV, via HDMI, and experience no delay on video whatsoever, meaning that the delay when running through the amp must be the amps fault. A couple of questions, could it possibly be to do with the HDMI cable that's running from the AMP to the TV? If this wasn't high enough spec would it not be able to support the auto lip sync feature of the AMP? Also, I assume the HDMI cable that is running from the media centre to the AMP has nothing to do with it, since the auto lip sync is about the amp receiving a signal back from the TV about video/audio timings? Also, I find it odd that in the NR1602 manual it says that you can only adjust audio delay if you have auto lip sync feature switched to ON. Logically, I would have thought that audio delay is a manual version of auto lip sync - but perhaps I'm misunderstanding. The NR1602 is running the latest firmware. The VT30 was updated by an on site engineer perhaps 3 months ago. I am using the HDMI 2 port on the TV, which is the only one labelled ARC. Would dearly love to get this working.