If you are interested in lip-sync I'd suggest reading:http://www.pixelinstruments.tv/pdf/A...Asynchrony.PDF
This is "science" not "fiction" (like so much snake oil this industry pitches to the gullible public - like giant speaker cables and tons of other stuff that has little to no real benefit) but the industry seems to have done a great job suppressing this information.
If you buy the Stanford research - that lip-sync error - even when unnoticed has a negative impact on our perception of the characters -making us feel they are more anxious, less successful, less persuasive, etc. you won't find an a/v receiver with a lip-sync correction feature that solves this problem.
They all seem to regard lip-sync error as being caused entirely by the fixed video delay from a display when in reality that is often less than half the problem. The rest is in the arriving signals and in my personal system varies randomly from program to program from audio arriving 71 ms early to 39 ms late. My display only adds 60 ms of video delay so it is the lesser contributor to lip-sync error.
A/V receivers which put their delay function in a set-up menu overlaying the screen during adjustment (and I've never even read about one that doesn't) as if it were a set-and-forget parameter can't solve the problem caused by this variable lip-sync error.
Only three products that I know of can: An Alchemy2 digital delay line, a Felston DD740 (or older DD340 or DD540 too) or a Primare Delay Box.
All three are digital (s/pdif coax and optical) audio delays which intercept the s/pdif audio between your sources and a/v receiver and allow you to delay it is 1 ms increments (and 1/3 also on the DD740) via + and - buttons on their remote handsets but the important thing is that they do not disturb the image during adjustment like a/v receivers do. That is essential if you want to achieve lip-sync because scenes with lips appropriate for the subjective adjustment don't always come along early in a program or stay on screen long enough to confirm the change. You may need to tweak the delay several minutes into a program and disruptive menus would make that essentially impossible.
The other caveat is "enough delay". Most A/V receivers offer too little delay with some only having 80 ms which is seldom enough and even those with 200 ms would fall to 100 ms at 96 KHz which is often too little especially for the larger video delays in HDTV.
I use a Felston DD740 (and had a DD340 and DD540 before it) but all three of these boxes that i mentioned work similarly and all have over 600 ms delay which can handle the largest delays you are likely to encounter.
And don't be misled by HDMI 1.3's claim of "automatic lip-sync correction". That's definitely a misnomer since automatic lip-sync correction is not possible due to the fact that there is no watermark in the signals to define when they were "ever" in-sync.
All that feature does is allow a 1.3 display to tell a 1.3 receiver what video delay it will add (through the HDMI EDID handshaking). For example in my case my display would tell my receiver it adds 60 ms video delay and the receiver would add 60 ms audio delay.
That's basically the same as you manually setting a 60 ms fixed delay in a normal av receiver so this highly touted "feature" would save you perhaps a minute "one time" but the point is neither it's automatic setting nor your manual setting of a "fixed delay" can correct for the variable lip-sync error and it actually makes the problem worse than if left uncorrected if the audio arrives delayed!
That's right, HDMI 1.3 's "automatic lip-sync correction" can actually exacerbate the lip-sync problem rather than correcting it. Take my system for example where my arriving signals come in ranging from audio "ahead" of video by 71 ms to audio being delayed by 39ms and my display delays video 60 ms.
Consider the case where audio arrives delayed 39 ms. If I did nothing - no delay applied - I would only see a 21 ms leading audio lip-sync error because 39 ms of my display's 60 ms video delay would cancel the 39 ms delayed audio leaving only 21 ms lip-sync error. Now consider the same situation with HDMI 1.3: The 1.3 display would tell the 1.3 receiver to add 60 ms audio delay so I would see 39 ms delayed audio - nearly double the lip-sync error rather than correcting it.
It is important to set a receivers delay to zero (and turn off HDMI 1.3's automatic lip-sync correction) when using one of the delay units I mentioned so that you can use the video delay of your display to correct for audio delay in the arriving signals.
With my DD740 I would apply 21 ms of delay for the case when audio arrives delayed by 39 ms. 39 ms of the display's 60 ms video delay would cancel the arriving audio delay and the remaining 21 ms of my display's video delay would be cancelled by the 21 ms audio delay from the DD740.
It would work the same way with the other units so you effectively have a negative time adjustment equal to your display's video delay. That is a display with a 100 ms video delay in conjunction with a DD740 would have a lip-sync correction range of -100 to +580 ms meaning it could maintain perfect sync for audio delayed up to 100 ms all the way to audio arriving early by 580 ms.
I could not watch TV without my DD740 so if lip-sync is important to you I'd suggest you look very carefully before buying a new receiver expecting it to correct lip-sync. Unless one has come on the market that allows tweaking of the delay without image disturbance all you will be doing is masking the problem perhaps reducing lip-sync error enough that you can again look away from the faces of the characters and ignore it but that does not solve the problem - not the 'real" problem of lip-sync error undermining the very essence of cinema itself -our impression of the characters.