Originally Posted by shane55
If he's going to go digital with all audio output, why not just use the D-3 for all? Digital is digital (yeah, yeah... for the most part), so what would the spdif advantage be for the two mentioned?
First, I am not sure which of DL3 and S/PDIF is better for CD, due to some unknown implementation detail. But for DVD-V, I believe that the jitter-free clock feature of DL3 won't work with audio along with video. That flow-control feature like i.link(aka HATS, PQLS) uses fixed-frequency crystal oscillator at the receiver side. This is the best for audio, but the problem is the video which can't be synchronized with the receiver side clock.
When you use DL or i.link, and the video is sent along together, designers disable the the flow control to avoid lip-sync error. Then, the audio clock is generated by some PLL at the receiver side. This is known to have pretty bad clock quality. Jitter could go up to uS order, compared to ~ 100ps by crystal oscillator or up to hundreds of nanosecond by S/PDIF receiver PLL.
One more thing to note is about HDMI. HDMI uses similar S/W-controlled PLL to generate audio clock from the video clock that is sent over the physical HDMI link. So, HDMI link has worse clock quality than S/PDIF's as well, unless they use 2nd PLL to reduce the jitter.