what Gareth and N-OS X-tasy, as long as the media was recently and well mixed in 5.1 (or 3.1).
Media that has been
upmixed with an app can vary, a lot, depending on the app and how it's applied.
But the apps have become much more
sophisticated of late.
A long explanation.
Longer and historical explanation.
Some modern rcvrs have the "ability" to upmix.
but where local OTA stations are concerned rather than actual media or streaming services that get the idea, Netflix, Apple, HBO .... YMMD.
One place I work has 5.1 wrongly installed from my pov. But it's a corporate facility. Decisions are slow and not necessarily made with full understanding by the "deciders" who may be more interested in showing off whos' zipper is longer.
My friends place down the block is extremely well designed and installed by JBL and Dolby as 9.2 or 11.2 (I fergit which). With the most modern kick ass dig audio console .... anywhere.
For me, it sounds way better than the JBL/Dolby demo I heard some years back when Atmos officially hit the streets. But that was a demo room and people were still wrapping their ears around getting 5.1 right let alone immersive.
After hearing their "system", there was no reason for me to update my "home theater".
As a true audio professional, my "home theater" is stereo, no .1, a 10-year-old 5.1 rcvr, and probably 35 yo design ROR speakers.
I'm not sure they were ever commercially released.
The were designed by Ted Rothstein and Shimon Ron.
A couple of very smart guys what had their hands in early Electric Lady, Record Plant NYC, and Bearsville Studios, NY, among others.
In television, where I work now, if it looks good, it sounds fine.
But if it sounds great, no one gives a grumpy.
“Art is how we decorate space.
Music is how we decorate time.”
Jean-Michel Basquiat