Well, here goes my first posting here. And yep, as usual it's a problem of some kind. After reading a few posts here about the difference between DD & DTS I thought I'd take a look as it's never really bothered me before. Anyway, I put on Gladiator and chose DTS but it seems to revert back to DD once the film starts. My amp (Sony STR-DB930) shows DD & DTS on the front. But my DVD player (Sony DVP-S315) only shows DD. Is this the problem? Will my DVD player not play DTS? They are connected by an optical cable if that makes any difference.