I just setup my Sonance MAG 6.1 garden series speaker system last. I first tried playing a movie and it seemed to only play the the front L and R sound channels, no audio dialog. The sound was coming from an AppleTV 4K via AirPlay. Next I tried playing music from my iPhone via AirPlay and again part of sound (the voice dialog is missing). Then I tried using the Sonos app Sonos Radio to play music and again the voice is missing.

I called Sonance an verified the speaker installation and the it is wired in parallel and all speakers and the subwoofer are working.

Anyone have any ideas why I am only get part of the audio program?