if you have the Q90R soundbar, you'd probably want to change the gain on each speaker separately.
rear left, top rear left, etc.
you also want more volume range, and not just up to +6. Mainly because the rear speakers are not powerful enough.
Why Samsung is doing this? This soundbar has so much more potential and very expensive, one would hope to see more common functions available in it and thus make it stand out more from the sea of Soundbars.
I wish someone would hack the bootloader of the soundbar and come up with a unlocked functions.