Thanks for the update. I remember when I first encountered the audio-lock-delay that I thought I was the only person who had it or actually noticed it. My player has been mainly a PS3 (connected through HDMI) for Bluray movies and the occasional CD/DVD and/or mediaserver streaming of music. I thought this set-up might not be that common in the market that Rotel sells, so I felt pretty lost and thought it was a problem unique to the PS3. I also tried connecting it through the optical cable, but that had the same problem even more - the problem there being that everytime no sound was audible, it would clip the sound as soon as something was played (like a menu click). At least through HDMI, the problem was limited to music playback when the player switches to the next track or when I skip a track myself. Also, why reduce yourself to optical if the whole point of HDMI is to enjoy high-res multichannel encoded movies (DTS-HD etc)....
To find out more about the problem; my dealer gave me a Rotel DVD player (that I hooked up via HDMI) to try out and to my amazement, it didn't exhibit any of these problems.
I think the last that I found out about the issue (I think when I was in direct contact with the B&W Group who handles the Support overhere) was that is the way the signal is transmitted. From what I understand - the receiver guys think it's a problem of the player, and the guys who make the players, they think as long as receiver guys do it right, it should work regardless. One would think HDMI should have made this whole mess easier for everyone.
One other issue that i have is that sometimes, the RSP1570 loses the signal and mistakenly thinks the DTS signal is actually PCM. The result is very bad DTS clipping/noise that can damage your speakers. I've had this happen to me a few times at the beginning but now take extra care when fast forwarding in movies (even mute it sometimes) to make absolutely sure this doesn't happen. I've had the same issue happen with some Dolby Digital AC3 inputs as well, though they are quite rare. Also not sure if that is due the RSP1570 or the player... one way or the other, it's not very comforting. Not sure if you've ever experienced this on the 1572... I hope not.
I'm not sure, but if you search my post history on here, you should find the old topic of the RSP1570. I think there was some good information posted there on the same issue.
But yeah, as I said, I've learned to deal with it and not be bothered by it anymore.
Anyway, thanks a lot for the update. I might give the RSP1572 a go (I will test it first), simply because it might be the last of the 15 series and I like the idea of being a bit future proof with the HDMI 1.4, although I still have no interest in 3D movies at home. What I might be a bit concerned about on the new RSP1572 is the new remote (?) and I was wondering if the Faroudja scalar introduces some lag - and if yes, how much? It's probably a non-issue, but I actually bought a projector with a low picture latency because I use it for gaming where latency is crucial. Given that I have a RMB-1575 and the RSP1570, sticking with the 15 series would be nice as it fits in nicely.
Picture of my setup: