A speaker system with less than ideal crossovers will ruin piano every time. I have hybrid ESLs with the bass woofers crossing over at about 500Hz, pretty much right in the middle of the keyboard. Yikes! Thankfully, I simply can't tell when the notes cross over and the timbre never changes. Well done.
I heard a respected 3-way system once playing piano and it was super obvious when the notes switched drivers. That experience has since made piano my "tester" for speaker integrity/reproduction.