I normally use a Comcast hi def pvr connected to a Denon receiver using component and optical cables to Samsung DLPs and Polk Audio Csi3 Center channel. I have had a lot of problems with audio and video not lining up. I have screwed around with extreme speaker distance modifications but it's just jerry rigging. The problem seems to be worse on hi def stations and it varies by station. Ads for local news programs seem to be the worse. It looks like bad Japanese dubbing. thanks in advance for any help.

I'm watching this because it seems I've seen it more with Denon than with most others.

I have seen it more on Hi Def as well with Yamaha's and D-TV as well. Comes and goes which is the hardest part.

Hi-def is more to process, so it takes more time. Denon has a delay feature which is ajustable that will slow down the audio to sync with the video. With a DLP set you should always sell a receiver with delay capability just in case. I think Denon starts with the AVR2807.

I've done a few systems lately with Denon AVR's (various models), Denon DVD's (typically the 1920's) and JVC 56inch 1080p models with absolutely no lip sync issues. 2 instals used comcast cable with hidef using component video and 2 were DTV. I allways use the HDMI from the Denon DVD because of the Faroudja chip it uses and component from everything else. One thing I have done though is route the video direct rather than through the AVR, I usually do this when possible just to minimize the number of connections and chances of signal degradation. Anyway I have yet to experience a problem.

The problem is that some channels have a lip sync problem and others don't. If you adjust the receiver to compensate for this( assuming that all of them need the same delay) them you will have the channels that didn't have the problem with the same problem. Basically there is nothing you can do about it.

Well then its a comcast problem and there is not a right answer for what to do. I doubt you want the customer messing with the delay time. Especially if it just depends on what channel you happen to be watching.

As a footnote, it actually starts with the AVR1706. :)

I agree, trying to fix the problem by adjusting the receiver settings is the wrong way to go. I have never seen this problem here in the Denver market or back in Minnesota where I set up a similar system for a relative. I would talk to comcast, it could be a cable box problem...

We have had this issue with the On Demand feature only, however, it was with a Denon. Apparently the On Demand feature requires a very specific signal strength, can't be too high or too low. Took us meeting five different Comcast guys five times. They always pointed the finger at us, then we finally got a guy who admitted it and took out the amplifier and everything was fine.

If you watch the same channel, does it get better and worse? If so, there is really not much to be done.

Here in the NW, we have Wavebroadband, they use the same Moto HDDVR. I have one in my own system. I only have the lipsync issues on the local ABC affiliate in HD.

I notice it on hdmi dvd players. dvds2500 -> RXV4600 -> Q006. Really bad lipsync problem. Same system SA8300hd component ->RXV4600 ->q006 no lipsync problem.?

Instead of running an optical connection, just run L/R analog audio. I know this is a step down in that it won't be a digital signal, but i have found that this fixes the problem everytime.