I bought a BT adapter for the AMP 1200 even tho I was an employee:
https://www.amazon.com/Logitech-Bluetooth-Audio-Adapter-Streaming/dp/B00IQBSW28
The only audio source we used with it was smartphones, connected via BT or direct line-in via cable.
You could attach other sources to it as well ... it had input jacks. We just used smartphones. No CD players, no AM/FM radio, no record players, just phones.
The AMP1200 system drove about eight speakers inside a restaurant, which is where I worked at the time. It was essentially one large room, roughly the size of a tennis court, as it had an open kitchen.
I don't recall which Sonos system it was replaced with, but it also had about a eight speakers. It would randomly cease playing music from time to time.
The Sonos was entirely app-driven and the app was unpleasant and non-intuitive compared to using Apple Music directly (which is what I did on the AMP1200 system.) The AMP1200 had a physical volume knob attached which was nice, and the Sonos lacked. The audio quality of Sonos and the AMP 1200 was about the same.
It was the first time I ever used Sonos and after my experience with it, I would noy buy one for personal use. Apparently other people have had good experiences w/ Sonos ... I have not.
I've come across those recent-ish news articles of users complaining of the Sonos app and I'm definitely not surprised to read such news.
The AMP1200 used cables to connect speakers ... it could have been used in a mult-room set-up so long as you ran the wires to achieve that.
I found Sonos to be flakey and unrefined.