Let me see if I can sum this up right and get what exactly 6.1 is. There are DVD's encoded with DTS-ES that have a real 6th channel- one that's actually programmed to be it's own unique channel, encoded into the DVD. Then there's Dolby Digital EX and DTS-ES Matrix which are programmed from the DVD creators to take certain parts of the rear speakers in the 5.1 setup, and form a 6th channel. This isn't as fake as your receiver trying to make one, because it's encoded that way right on the DVD. So, it's still a pretty clearly designated 6th channel. Then, lastly, you can use a receiver to fake DD EX or DTS Matrix on any 5.1 which just guesses from the rear two channels and tries to come up with a 6th one. So, to restate, there's 3 ways to have 6.1: 1. DTS-ES - real 6th channel. 2. Dolby Digital EX or DTS-ES Matrix - an encoded mix of the back two channels, making a semi-real 6th channel. 3. Dolby Digital 5.1 or DTS with receiver forcing 6.1 - fake 6th channel that's a mixture of the back two. That's my understanding of it after my studying into it. Anyone, step in if I'm wrong. A few questions to add: 1. As I said, I can tell the receiver to fake a back channel for any 5.1 DVD. What's you guys' experience with the results? Is that usually a good thing, or do you all find that it is better just to leave it alone? 2. On DVD's that have Dolby Digital EX and a DTS channel (not DTS-ES), is it better to go with the DD EX, or just go DTS Matrixed? (Pirates of the Carribean, for example) 3. How beneficial do you think it is to have a 7th speaker? Or, what really is the point? Does it just balance things better? 4. My receiver has outputs for 6 speakers, but I don't see a seventh. After reading the Primer, I gather that I have to have a specific receiver for 7.l. I know there's only 6 discrete channels though, so I just want to be sure: Does this mean 7.1 is not an option on a 6.1 receiver -- no way to separate the 6th channel externally into two rear speakers?