I have a PC with my RTX 3090 hooked to a Benq TK700Sti. I then have the eARC returned from the projector to the Beam, Sub, and two One SL.
In the sound settings in windows, it senses that the max number of channels is 6, and also shows several supported formats, which includes Dolby digital 5.1. Additionally, I am able to go through setup and select correct correct positions and even enable the 5.1 setting. Everything seems like it should work.
The problem is that when I actually try to test the speakers, the left and right channels are the only ones that play sound. If I click on the symbol of any other channel in the testing diagram, no sound plays. Also, if I play Netflix or something, the Sonos app says it is playing in stereo PCM.
The 5.1 setup is identical for my Apple TV 4K and my PS5, and I get proper Dolby Digital 5.1 with those.
Any idea what the problem could be?
Best answer by Corry PView original