Best answer by Airgetlam
The Sonos Amp does not support a Center speaker, instead it creates a “phantom” center channel by combining signals through the left and right speakers.
Best answer by Airgetlam
Having exactly the same problem as everyone else! Sub not working when connected to a brand new Sonos Amp. Cable and Sub working just fine on my old receiver.
Will this be fixed by Sonos? Havent seen any official comment from Sonos on this issue wich seems to be VERY common.