@TLS Guy, I need clear dialog for movies. When I switch to TV, the AVR autos to DD, Surround. When streaming Netflix through TV App, AVR switches to DD TV, for surround through speakers. I have the sound auto switching to whatever source in use. This saves time to adjust sound for each source. All sources are fed to the AVR, with the TV utilizing eArc. Anyway, tomorrow, I will do some experimenting and go from there. Again, appreciate your suggestive input.
It is very hard for me to answer these questions as I don't seem to encounter the types of issues that others have.
I have a carefully balanced system, and my center speaker is essentially totally unique, and quite unlike anything on the market. I would say though that I have zero issues with dialog, for movies or TV. That also applies to my 2.1 system and 3.1 system. For the later it does not matter if it is run 2.1 or 3.1 the difference is minimal and my wife can not tell the difference. The AV fronts are a totally integrated speakers, with the sub 1 and 2 channels reproduced by the four drivers in the long transmission lines of the front right and left speakers. The surround backs also have a response well down to 20Hz, the 3 db point is 27Hz The 3.1 system also has a TL sub. The family room system uses two isobarik subs, but the front speakers don't start to roll off until just below 30Hz, so the subs are only "marginally cracked open" below 40 Hz. To be honest they make a minimal contribution.
Now I listen mainly to music, symphonic, chamber , solo, choral and opera. I do not listen to multi miked highly processed pop music if I can help it.
I listen to 2 channel in the AV room with the DD Surround upmixer. In the 3.1 system I listen 2.1. I find the Dolby upmixer works well for me in the main. If not I listen 2.1. That is rare. On those occasions when I do have to listen to highly processed rock/pop, then the upmixer invariably makes a total mess of it, and I have to go 2.1.
I am not guessing here, but using hard data from my analysis of the wav. files, that the processing of "pop/rock" totally destroys normal phase relationships and the up mixer can not work. That is the reason people who listen to this type of music have to use center spread.
So I do not use center spread when using the upmixer, and in almost all cases the balance between right, left and center speakers is optimal. For opera voices move seamlessly across the stage as they should without variation of tonality.
For multichannel and Atmos I leave everything the way it was mixed pretty much.
I find the upmixer does a quite remarkable job of conveying the acoustic of the venue. Not as good as discrete Atmos recordings, but it is very good.
So, I leave my systems essentially alone. I have done careful set up with measurements and never get an itch to change anything. I really just change volume and switch inputs pretty much. That way I enjoy my programs.