I came across a Sonos installation when looking at the houses Wifi issues. It has 11 pair of speakers connected via two speaker switchers.........
I asked about the Sonos system and how it sounded, they didn't really have any issues with it. I didn't pursue it anymore and went on to check the WiFi issues.
Damn, I can guarantee if it was done right they'd be able to tell the difference. It's kinda like when you ask "how's the WiFi working?", "It's fine, why?". You can see they have two or three routers, extenders, etc with different names in the house. You pull it all out and out in a decent system and then they say "wow, I didn't know it was supposed to work that quick".
Sometimes you don't know how bad things really are until you try something else.