Why do the Clarinovas sound better? Just wondering...thanks.
When you listen to a digital piano, what you hear is the speaker. Yes there is a bunch of "stuff" driving that speaker, like multi-layered samples, key-off samples and and amplifier but in the end you hear the speaker.
Would a pair of monitors help? Likely yes but you have to experiment with the speakers, the amp and placement of the speakers and the direction they face. You might find for example the monitors sound best when mounted "knee high" facing up at the ceiling bases forward if your piano is backed up to a hard surface wall Of they might be best in the more conventional ear level both facing forward. It all depends on the room. It also depends if the player or the audience is to have the best sound.
Amps matter too. You can buy powered monitors and take whatever comes inside or you can audition amps and maybe even effects boxes like reverbs and active crossovers.
I'm experimenting. I'm finding I like the sound of vacuum tubes. I think they help kill the "digital sound" and then full rang speakers mounted at a tilt. Some day I'll figure out a sound system I like.
In the end you could easily spend $1,000 on a sound system or even 5X that much.