I'll agree with Aroc and add bass done properly which to me means proper weight. Also agree that planars tend to sound more real than cones for accuracy.
What sonic characteristics matter the most?
When you listen to the overall sonic signature of your system which specific characteristics [ timbres, details,transparency, mico/maco-dynamics, imagining/soundstage, prat, low frequency reponse,etc.]are the most important and least important regarding your highest level of relaxation and pleasure of the music you are playing at that moment? I also would be very interested if you GON members would not only share what are your priorities on this topic, but the underlying reasons for these priorities. I think it will be fascinating to see how similar or divergent we are in what matters the most or the least regarding these characteristics in the sound of our systems. Thanks to all who are willing to share.