So I wanted to play my decks but coming through the Sonos throughout my house and as I’m sure everyone’s aware it’s been said it’s impossible, however I’ve found a way!!! 
 

so connecting the decks to the Sonos Ray which has a optical input 

so you’ll need a rca cable splitter to optical  ( this connects the decks to the Sonos ray ) 

now with this set up there is a delay from the decks headphones and the Sonos playing .

so to sort this you’ll need to purchase a lip sync corrector 

And a aux to rca cable x 2 of these 

When that’s connected I found my deck headphones where super quite so I bought an amp to make them louder .

so from the decks to the Sonos ray is rca to optical lead

and to sort the delay is a aux to rca cable plugging into a lip sync corrector which then plugged into a headphone amplifier via rca to aux lead then plug your headphones into that 

 Links below 

https://cpc.farnell.com/cyp/au-d18/lip-sync-corrector-adjustable/dp/AV21325

https://cpc.farnell.com/pro-signal/psg3414/hi-res-dac-headphone-amplifier/dp/AV29090?st=Pro%20amp%20headphone

there is a 75ms delay from when you use the decks to the sound being produced , I personally can’t even tell.