I cannot find this "PCM" option, but instead there is a "Passthrough" option, which is currently enabled, and I think that's the same as having PCM disabled. ... View more

Hi,   Not sure which is the reason, but the low volume on rear speakers when in surround mode has been fixed for me recently, either when I upgraded the R1 firmware to version 3117 (not published on website, but forcing an update from the app will trigger the update), or when I switched from a 5 GHz to a 2.4 GHz wifi connection.   ... View more