Hello, I have a Pioneer VSX 1015 THX reciever with 7.1 speakers. My reciever has an option to turn the extended mode off for watching 5.1 movies so the rear speakers will be inactive. The manual claims many movies might actually sound better this way because they were inteded to be 5.1. I do notice sometimes when watching movies there isnt a ton of sound coming from the side or rear speakers unless its an action / adventure movie. Any thoughts on if its better to watch a 5.1 movie in 5.1 or 7.1? Thank you!