Nothing good about Dynaudio at low volumes. Good sound at low volumes is complex and not related to sensitivity either. There are some speakers with a deserved reputation for good sound at low volumes, Harbeth comes to mind.
How your system attenuates volume matters hugely in this equation too. Autoformer volume controls like those from Slagle excel at low volume listening as they are at max current when at high attenuation, unlike resistor ladders.
As a rule 90% of the low sensitivity monitors out there with main drivers in the classic 6.5" range sound best with SS amps that thump a bit in the midbass (ie Pass) That is where many fall short at low volumes, they need to be playing louder to come on song and sound balanced. An amp that hits a bit harder can make up for that at lower volumes.
Old Tannoy professional system 10 and System 1000 are excellent at low volumes and don't need a ton of power to be on song at low volume. Pretty sensitive too.