I've recently got back into AV and purchased an Arcam AVR300. The problem is that I am very disappointed with the overall surround sound performance of most films and only films with DTS seem to bring the system alive. I'm using the AVR300 in 5.1 format only. I have recently tried all of the Star Wars Trilogy and Top Gun. All of these films encode in Dolby Digital only on my system and do not sound OK but not great. However, Master & Command and The Return Of The King both play in DTS and sound excellent. Am I doing something wrong ? Any helpful comments would be much appreciated.