ok so i have the denon 3803 and it has a afdm setting, my guess is this is an auto flag detection mode. the book has no reference that i can find to what this does or is for. just one drawing of how to turn it on. it appears to turn the rear center ss channel on for every dvd. but if you set it to auto detect it will do that anyway for anything properly flagged. for dvd's like Sith and some newer star trek dvds you have to manually turn on the rear center channel. so i ask, what is afdm for?