It's been said that the more power you have in your stereo the better. Massed choirs and close miked piano are terrible for power needs and many speakers with passive crossovers can also have difficulty here as so many go wrong to one degree or another right where the ear is most sensitive, although if the issue clears at lower volume it's more of a power issue I'm afraid.
The other thing is that smaller domestic speakers just cannot give the scale a full-power orchestral work needs and one thing I remember from my big ATC active owning days is how much more effortless music like this became. The full twin-bass ATC's took this even further and these could probably go louder cleanly in a typical room than the real thing in a concert hall - I'll never forget my session with some ATC SCM200A's in a living-room sized, well, living room - absolutely incredible unforced and unfettered dynamics I'd never heard before or since, one track being with a tenor voice with piano accompaniment - astonishing!
Tear down these walls; Cut the ties that held me
Crying out at the top of my voice; Tell me now if you can hear me