Ken, I finally took a look at the manuals. The delay instructions for the 525 are among the worst that I've ever read(that's saying a lot as manuals go), switching back and forth from speaker to listener distance and then speaker to TV screen distance. Then, as you say, it doesn't mention distance to the main front speakers at all. Nevertheless, the only thing that seems to make sense is that the distance to be measured has to be from each speaker to the listener's ears(including the height factor). Although it seems odd, as Peter said maybe the 525 computes the unspecified front speaker distance as being equal to the center(which it's supposed to be). I also looked at the 630 manual, and as a couple _30 owners here have indicated, it's been changed and has clearer delay instructions, including the main front speakers. Strange.
