Surely Meridian drivers aren't just of the self units? I recall reading here somewhere that they are designed to there specification by the large OEM companies. At any rate even if there using $2 drivers they sound fine to me.

Living Room Kit: 861v4+ID40, DSP7000, DSP5500, DSP5500HC, HD621
Bedroom Kit: F80
QNAP TVS-471, Roon, iPad Air2