I had a decently reviewed mid range soundbar with surround speakers and subwoofer from Sony a couple of years ago and voice in a lot of films/TV was often drowned out by music or background sounds. Not many options to adjust but nothing really helped. Eventually changed it to a high end Samsung Q950A soundbar and the difference was night and day. I can only assume that the Sony had a really weak centre speaker or it just didn't process it properly. Won't ever buy Sony again.
If going for a soundbar for speech clarity I'd make sure it's a 3.0 as a minimum. The center channel really helps in that regard.
Ordered myself a Sonos Beam Gen 1 soundbar (second hand).. Hope it works well. I'm looking forward to watching tv without angrily shouting "FFS!" when the music comes on and quickly reaching for the volume control.Will be checking back here to see how you get on because been having the exact same issues. To hear conversations I end up with the other sounds far too loud . It seems especially more noticeable when watching things on nowtv unless I'm imagining it