11.1 is actually 11.1.4:
Speakers: 7 Soundbar + 4 Rear
Subwoofer: 1 Sub
Atmos: 2 Soundbar + 2 Rear

Unfortunately, I can't say anything about Q-Symphony.
But the sound is still very good.

Don't know if it has 11 speakers or if it means soundbar + TV speakers.

The answer to Q-Symphony is clear: it doesn't work at all.
Neither technicians from Mediamarkt - M-Electronic - Interdicount have managed to activate this function! Samsung Support DE and CH as well as tel. support have not managed it either. I also read on the internet that it doesn't work! Seems to be just a big publicity stunt. (That's why I bought the expensive HW950 and TV 65/800A. ) By the way, I didn't even get an answer to an e-mail to the management on the Samsung side. I WAS a loyal Samsung customer!