Optical Cable Connection From Amp 2.1 to my Computer to make Computer an audio source

The bottom line is, unless we are talking audio streaming only that has no need to be synched with the screen, Sonos’ analog Line-In is not a good bet because all real time audio must be buffered for transmission to other rooms.  Video specific units like the soundbars and Amps, which connect to a TV via HDMI-ARC, have a special connection to subs and surrounds that has a much smaller buffer, but it is limited to transmission in a single room.  If you attempt to send TV sound to other rooms, even that is delayed due to the buffer inserted for multi-room streaming.  

Thanks jgatie..!….yes this will be audio only...I am a musician and have bands studio recordings as files on my computer and I want to play them….basically only an audio source is needed….and my bad for stating the incorrect optic in/out!

I believe that the best signal available will be 3.5 headphone out on lenovo to phono in (l and r) on sonos amp...adjustments and alignment I assume can be made on the app?

Use a 3.5mm stereo y-cable,

Yes Thanks….any complications or directions in app set up between lenovo and amp after properly wiring (3.5mm headphone out to rca in l and r on amp)..? 

Could you not just point Sonos to you music library? https://support.sonos.com/en/article/add-your-music-library-to-sonos

The only advice I would give is disable all sounds from the computer.

Thanks…..anything in the sonos app?

I now have headphone out on the sonos (3.5mm stereo)….into phono inputs on back of sonos 2.1 (rca l and r)….signal shows strong on my computer…..so output is good….in sonos app on my phone in amp settings line-in says connected...source name I checked computer, source level 8 (pc), autoplay volume on 78%... what am I doing wrong please?

Oh...no sound out of sonos system….sorry

What Sonos headphone outs? Do you have a Gen 1 Play 5, the only Sonos I've had with headphone output?

Still have no clue what a Sonos 2.1 is. Could you give us the actual device name?