Originally Posted by Fanboyz
Yes but it still gets sent out as 6.1 cpm with a silent Back surround channel.
You can't add THX-Surround EX to something that the receiver already thinks is in 6/7.1.
Had a play with my system and THX works, but Cinema 2 and EX modes are disabled because the AVR thinks the input is discrete all the time. All I can select is THX Cinema, THX Music or THX Game and all 8 channel lights are on. I got the same for my PC connected over HDMI as well even for 2CH music. All 8 lights are on yet sound comes from front L and R only.
So yes back surround is folded into the rear surrounds but the Oppos and the PS3 still send out a 6.1 LPCM track with an empty back channel.
So where does the OPPO and PS3 send the 6th channel to? If it is doing this properly, it should either send it to both back surrounds or simply fold it back into the surrounds of the main 5.1 mix. Mine appears to fold. The point I am making is that you don't lose that back surround info, you still hear it. Again, not perfect, but better than dropouts.