Specially when playing an instrument the room reflections and phase distortions are VERY noticeable, and can be corrected.

Even in many home cinema systems there is some form of this avaiable.

This can all be accomplished  with the proper plugin in your DAW of course, but there are nowadays solutions  in the form of active speakers with ARC built in, like the Iloud MTM from ik multimedia, which comes with measurement microphone included.

An NO ,i have no connections with them....haha! But really, for at home lsp reproduction, this is the way to go!!

I have experimented a while with a Blue Sky 2.1 system of a very good quality, that I still use in my studio for double checking my mixes.  Unfortunately, it did not sound good for PLAYING piano. Even if the satellites are small and were mounted on microphone stands, the system failed to give a sense of connection to the sound.

I happen to be using PTQ with a set of Blue Sky MediaDesk 2.1 monitors. The 4-inch satellites are placed on foam pads on top of the digital piano and the sub is sitting next to it. Overall I do like the playing feel in this setup. I don't perceive the bass as separate from the rest of the sound. I agree that super low subbass is not needed for a piano to sound lifelike.

In my setup I find the sound more piano-like if I let the speakers lie on their backs firing upwards. That way one has less of a feeling of listening to speakers, as the sound gets dispersed more in a way that is similar to how a piano standing in the room would do it. Additionally, using the line-in on the DP to add another PTQ channel adds another bit of immersion, as e.g. the keys slightly vibrate on the lower notes. In my PTQ mic presets I try to place the mics at positions that mimic the speaker locations in my setup. I.e. one left and right over the soundboard, and another one under the piano, for the DP speaker.

I prefer stereo or even a mono, with a quality speaker, than a 3D sound with poor speakers.

Bass response has to be sufficient, but there is little need for extreme bass response. I forgot the exact link (I'll look for it), but rigorous frequency content measurements have been made on grand pianos that showed that the amount of energy in the very low (<50 Hz) frequencies is surprisingly small. Not to mention that most typical rooms used by pianists are not large enough or not acoustically suitable for deep bass reproduction.

I wonder whether anyone here tried to play Pianoteq through a regular 2.1 system (2 little speakers and a subwoofer).

I'd like to stress that I'm meaning here 2 little speakers (not studio monitors) and the sub.
I've seen some pretty decent youtube piano players that have this setup (not necessarily with PTQ) and was wondering whether you could get any satisfying result.

Regards,
David