My test above was done with BT earbuds. Just a local file. No internet music streaming.
I played a 1920x800 video with mpv. DE is GNOME. PPD set to power. Power consumption is 6.5-8W: fullscreen is a little lower, window is a little higher, BT or computer speaker audio does not look much different.
My understanding is that the EC update 3.03b was only released as beta and was incorporated into BIOS release 3.05.