Get a Sonos Roam and output the Mac audio over Bluetooth (or Airplay) to that device and then group it with your Play:1 in the Sonos S2 App is perhaps the easiest/cheapest way to achieve the outcome - both Sonos products need to be on the same WiFi network.

Oki thank you ken 

so basically i can use the roam the one sl the ray or the era for group with the play 1 and then send the audio via bluetooth from my computer on the one of the previous speaker and then this one will dispach on the play 1 

do i understand properly ? 
sorry im new to sonos 

Yes. I’m doing this currently…using AirPlay 2 to send a signal from my Apple TV to a Sonos One, which is grouped with a pair of PLAY:3s in the Sonos system. I’ve turned down the Sonos One, and listen to the PLAY:3s. 

I’ve also done this with a Sonos Roam, using either Bluetooth, or AirPlay 2 from my iPad and grouping my Roam with either my PLAY:1s or PLAY:3s to my Sonos. 

thank you guys

just bought roam but i cannot group with the play 1 do you know how to do it ?

Use the Room menu on the App.

Tap the square icon in the Roam’s room.

Tap the line for your Play 1 and then done.

thank you very much guys you are awesome find out the solution with your advice