I have an Apple TV 4K plugged into a Vizio TV via HDMI, and a Vizio soundbar plugged into the TV via an optical cable.
When watching movies, the volume range is pretty good. Setting my soundbar to its lowest volume point leads to low volume, and a comfortable listening volume is about 1/3-1/2 of the max volume.
But when listening to music via Apple Music app on the Apple TV, setting the soundbar to its lowest volume point still outputs loud music. There is no way I can comfortably set it to something between mute and loud. Increasing the volume on the soundbar by 1 step up from mute leads to music that is louder than what I would expect at this low volume point.
I am able to mitigate this by enabling Reduce Loud Sounds and Sound check, but the music is still a bit too loud to my taste, even on the lowest volume point on my soundbar. Plus, Reduce Loud Sounds has a negative effect on the music (highs are muffled, etc).
So what I've been doing to avoid this issue is to Airplay from my Mac to the Apple TV and setting the volume to 50% in iTunes on my Mac, but it kind of defeats the purpose.
I am observing the same behaviour with my 4th generation Apple TV, plugged into a Yamaha receiver via HDMI. When watching movies, I set the receiver volume between -20db and -30db. But when listening to music, I have to set it between -50db and -60db. So, the same behaviour (music louder than movies), but since I have a finer-grained control over the volume with my receiver it is not really a problem.
How do I resolve the issue?