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It is highly likely there is a whole bunch of ’speaker profile’ DSP processing (basically, frequency equalisation) to make the tiny speakers in these little digital devices to make them sound pleasing - and, the QMX doesn’t have that processing, or know the profile of the speaker… so, in the first instance, it’s likely non-trivial to make those little speakers sound good without some effort.

tl;dr… it’s an interesting topic. It’s done in a DAB radios with internal speakers to make them sound good (seeing as you are already in the digital domain with DAB, it’s just one more thing in the processing chain…). My surround sound system does something equivalent by you placing a microphone where you sit, and it plays sounds, monitors itself, and does the EQ - and then sounds soooo much better than before the EQ.

If you are more interested then there is some open source software you can use to measure things:
and then you can either write code or purchase some DSP boards to do this for yourself :-)

I did consider adding the ability to my ham radio dsp audio processor so I could ‘eq’ to my shack… but ultimately didn’t need it…

73, Graham, 2E0WRW