I am new around this community, although I am using Sonos for about 8 months. I started with a Connect for the living room (to control the AV Receiver powered 7.1 system). Then I got another 2.1 + AV Receiver in the bedroom, which asked for another Connect, than Connect AMP for stereo speaker in the bathroom and another Connect AMP for a pair of B&W in the office area.
When I got all these together I found a buzzing delay between living room and the other 3 rooms. But this is happening only when I play the audio from the TV through Line-In, NOT when I am using online radio or play music from my phone/cloud/any other digital straight source.
Details for set-up of the living room system: the IPTV cable goes into the TV Receiver. Then, through a HDMI cable, both sound and video go to CBL/SAT input from the Denon AVR-X4100 A/V Receiver. The video signal goes out from the A/V Receiver to the TV through HDMI cable (ARC Monitor output from receiver and ARC input into TV). The TV is a 2012 Samsung Smart TV that has HDMI-CEC (Anynet+) function and it is active. From the same A/V receiver I take off the sound through the Optical Link and plugged into Connect's Optical In. So the Connect is basically taking the sound from the AV Receiver and sending it to the other 3 rooms. In the living room there is a 7.1 system (B&W based) connected to the A/V Receiver.
The point is that somewhere on the road, the living room speakers sound is ~ half second in front of the other rooms' sound. I mention that the other rooms have the same delay (all 3 sound the same, only the living room is ahead of time).
Any idea how can I fix this delay? Makes sense to have a small delay, because of the Optical Cable between AV Receiver and Connect, but maybe is something that can be done, as it is annoying to get from one room to another and to get the sound offset....
Sorry for the long post, but I wanted to make it as clear as I can :)