Theres a ton of questions on this and other forums about surround speakers not working well when PCM (Stereo) feed is detected and it seems there is a setting missing from the “Surround Audio” page of the controller.

This is especially the case in my set up, where my speakers are used primarily to fill the space in a large area so that music primarily fills the room, this set up works really well with stereo audio sources and really comes to life when we use surround sound (and apple spatial audio does this well).

However every time we come across a video source where stereo (PCM) audio is present, the ambient rear speakers just are not powerful enough to fill the room.
 

We have the option for Audio sources in the “Surround Audio” settings that allow for Ambient or Full Music Playback which is great for audio, but we need the exact same option for Stereo PCM (Video Equivalent) - Maybe this could even be solved by a tick box that just says “apply these settings to PCM Audio”

Obviously I realise there will be some video sources with PCM that would be better with Ambient, but giving users the choice to find the best balance in their own set up would be the better of two evils as the alternative is to group the speakers rather than use a surround set up.

Set up… Beam, One, Sone SL.  Samsung Frame TV