Believe me, I find it hard too. But, if you follow the other thread I linked, it seems as though the member is dead set on what seems to be fact.
I find it hard to believe that the 667 doesn't display DTS-MA or TRUE HD considering than even that model 2 generations ago was displaying both of those if using bitstreaming on the processor. Checking the OSD somewhere doesn't display this?
I just checked the manual for a picture of the display..and there definitely isn't a spot shown in the diagram for it like there is on the 663's. Shame. I can never see those little lights from that far away anyway
I'm not familiar with the newer GUI but surely there's a way to display what type of decoding it's doing. It would definitely be unsettling to never be able to even check it.
That is very odd indeed as my old Yamaha RX-V1800 displays this when encountered.
I want to answer this one once and for all:
There are two ways to view the current audio codec:
1) Press the "Info" button on the remote control and keep an eye on the Receiver front panel "large text area" where the input type is usually displayed. Each press of the "Info" button displays a different category, e.g. "Input", "Codec", etc.. Once you reach "Codec" it will display the category title momentarily then display the actual codec being used. Many times this will merely display "PCM" for digital sources.
2) Enter the OSD and choose "Info" from the upright column on the left of the screen. Then, from the row of choices that appear at the bottom of the screen, choose "Audio". This will display the current audio codec, and with more information than if shown on the front panel of the receiver. I have personally seen this section of the menu display "DTS-MA" and/or "Dolby True HD".
If an end user of this receiver is not seeing these codecs displayed, then it is quite possible that their source is performing the decoding and sending the signal to the receiver as linear PCM, in which case the codec will be displayed as such.
To the OP: I remember reading some years ago in Crutchfield that the ~$500 price point is where receivers really start to get "nice." While inflation and the economy has had some effect on the validity of that statement, it holds quite true with the '667. Mine has done everything I've asked of it without a single complication or technical issue. I've never looked at the owner's manual and, while I am a techie, I'm no genius to have figured out the OSD menu and various(!) other features myself.
With the '667, and many comparable receivers no doubt, you will not go wrong. Good luck and happy hunting!