Originally Posted by 117olddude
Having an interesting time trying to figure out why 5.1 source- played from BD via Direct or Prime Direct (either HD Dolby or HD DTS)- is coming out of 7.1 speakers....
So is this a design flaw, a receiver that has an issue, or something I have done? And remember, I started off with a fresh reset and, after running MCACC, pushed no buttons except for the two that control Direct/Prime Direct and DTS Master/Dolby HD.
You may be experiencing how the player implements DTS-MA. Some players, Pioneer's used to have this "feature", were designed to duplicate the side surrounds into the rears so that 5.1 >> "faux" 7.1. I know a number of Pioneer players & some Panasonic players implemented DTS-MA in this way at least a few years ago. I don't know about new Pio/Panny players. It was an option by DTS. And I don't know or remember if some Samsung, Sony & LG players ever did it this way.
This hasn't been discussed in quite awhile & I haven't visited BD player threads in a long time but it was a topic of discussion several years ago because many Pioneer AVR owners discovered they had 7.1 from 5.1 and also discovered that they could NOT add Dolby PLIIx, DTS Neo6 matrix processing. The only processing we could add on top of DTS-MA was THX. Oppo was one of the players that DID NOT duplicate the sides so earlier generations of receivers could add PLIIx with an Oppo player to get matrixed 7.1 instead of faux 7.1.
Dolby TrueHD was not an issue back then and if you had a 5.1 disc, it would stay 5.1 in Direct unless you were in Auto Surround & added PLIIx, etc. So if you are still getting 7.1 in Direct mode, the duplication implementation may not be what's causing it for you. It only applied to DTS-MA. So not sure why this would be happening with TrueHD unless it's also an issue with your player
I haven't kept up with newer BD players, owning both the older $2K Pioneer BDP-09 (which duplicated) and the Oppo 93 (which didn't duplicate) so have no idea if this is still an issue with some players.
So, if you have an older player, this may be what's happening to you. and if that's the case, there's nothing you can do about it unless you turn the rear channels off in the setup menu (not worth the hassle IMO).
I can't think of any other reason off the top of my head why you are getting this effect.