SpeakerLink is basically AES/EBU, i.e. balanced digital the sort of cables that are run for x00m in studios and venues including as spaghetti.

Meridian owner since 1992
Prime & PSU, Focal Elear headphones, Roon (ROCK 8Gi5 NUC), Explorer 1 & 2, F80. 200/203, various Sonos (via Roon).