I have 2 Sonos Hubs working great. One is connected through the optical output and the other through the digital coax output. I added a Sonos One connected through WiFi. The problem is that the Sonos One is a half second +/- ahead of both hubs. If I connect the hubs through the analog RCA inputs it sync’s perfectly. Conclusion: the delay is caused by the analog/digital conversion on the hubs? If that’s the root cause, is there a solution?