My question, does the Sonos Subwoofer output uses the 0.1 LFE (Low Frequency Effects) channel from Dolby 5.1? And where/how can I verify or test it?
If it is not there, you will loose low freq special effects in the audio.
I own a Onkyo A-9050 (stereo amp with subwoofer RCA out), but when it broke I used schematics to repair it. Then I noticed that the subwoofer out was just a 80hz lowpassfilter and the 0.1 LFE channel was not used at all even when the amp had a Optical input.
My setup is a B&W DM605 S2 and I now use a Optical TOSLINK from my 2019 LG-TV but I will change to HDMI ARC with a new 2.1 Amp. (maybe the SonosAmp).
hopefully someone can help me.