Originally Posted by MichaelEllis
I have just purchased and BenQ W1200 project from Amazon. Whilst this may be good projector I have found a serious problem with video delay.
When I present a synchronised video/audio stream via HDMI to the W1200, I observer there to be approximately 200 to 300ms of delay in the video channel. This means wholly unacceptable lip-sync probelms using the BenQ W1200 internal speakers (so what are they for then?) You can clearly feel the lag in projection if you connect the W1200 to your computer and mouse around the screen too (a significant fraction of a second!)
As a test, plugging the same source into my flat screen TV shows no observable lip-sync issues.
The problem is always there irrespective of any video processing options being on or off, although switching on frame interpolation may marginally exacerbate the problem.
I have since contacted BenQ and they advise that I send back the projector for a firmware upgrade, however they are unable to tell me what the maximum delay in the video channel can be.
HERE IS THE RUB
If the BenQ W1200 does have a video delay in excess of 200ms, it means that many AV receivers will not have insufficient audio delay to compensate!
For instance Marantz NR1602, NR1402, NR1401,NR1601, Dennon Cara all have maximum audio delays of 200ms!
As yet I have not purchased an AV receiver, but you can see why this delay information is critical to my choice of AV receiver. I consider it unfortunate that this information is not in the W1200's technical specification. I consider it reprehensible that the information cannot be provided when asked for!
My W1200 is running version firmware 1.0.2 I understand the current version in 1.0.4 but again BenQ decline to tell me what has changed!
Overall, not a happy bunny!
As an aside, I am considering writing an iPhone app that could accurately measure video projector delays. I'd be interested to know if anyone would pay a few quid for such a thing (I know i would)