When playing a song in spatial audio, you will see the Dolby Atmos logo displayed on the Now Playing screen in the Sonos app.
Spatial audio music will sound good through your Beam + Sub Mini + Era 100s setup. But a pair of Era 300s will probably sound better since it adds two height channels. An Arc + Sub + Era 300s setup is the best option.
Test these songs in Dolby Atmos:
"Rocket Man" - Elton John
"Riders on the Storm" - The Doors
"Take On Me" - a-ha
"BOOM" - Tiesto & Sevenn
“Space Oddity” - Davie Bowie
“Chasing Utopia” - xPropaganda
“Into the Mystic” - Van Morrison
“On the Run” - Pink Floyd
“Drive” - R.E.M.
“Personal Shopper” - Steven Wilson
“Come Away With Me” - Norah Jones
“End of Night” - Tears for Fears
“Harridan” - Porcupine Tree
“Tour de France / Prologue / Etape 1 / Chrono / Etape 2” - Kraftwerk
“Exotic Contents” - Max Cooper
Yeah I am definitely playing Dolby Atmos tracks through the Sonos app.
Through the Beam gen 2 together with the era 100s it sounds noticeable on Drive by REM for example. Playing the same song on just my era 300 I don’t really notice anything so I am a bit disappointed with the era 300 so far. Perhaps I need to try it in a different room and different positions.
Yeah I am definitely playing Dolby Atmos tracks through the Sonos app.
Through the Beam gen 2 together with the era 100s it sounds noticeable on Drive by REM for example. Playing the same song on just my era 300 I don’t really notice anything so I am a bit disappointed with the era 300 so far. Perhaps I need to try it in a different room and different positions.
For the Era 300, find a room with a 8-9 foot flat ceiling and sit about 8-9 feet from the speaker. Also, a single Era 300 does a good job playing spatial audio music for a single speaker, but it cannot compete with a multi-speaker setup with actual surround speakers. Although a pair of Era 300s in the right room setup comes pretty close.
Ok, have ordered another era 300…. we’ll see. 
Not impressed even with the stereo separation with just the one speaker.
