Why would you connect with Toslink? Sonos has an RCA out and your Yggdrasil has an RCA in, a better interface than toslink.Completely agree. I think that jond meant using the RCA COAX to the DAC, not the analog outputs.
I have a Sonos Connect that is connected using the RCA COAX to my DAC. I tried both outputs (toslink and coax) with numerous cables and always found the RCA COAX to sound much better.
I’ve never been a fan of toslink in any application.