What is meant when someone says a component is lacking soul


I have seen this mention in some reviews of the bell canto Evo 2i gen ii integrated amp.
smoky204

no soul=clinical, uninvolving

soul=more "body", perhaps even a little (horrors!) warmth

Recently had a glaring example of this when I sent my amp away for extensive modifications/rebuild and pulled out my slightly modded Adcom 555 back-up amp.  Gave it a couple weeks to come to life but never happened. What I wasn't hearing was any note decay, any hall sound.  The notes played but that was it.  Dynamically, it was like going from a Bosendorfer to a garden variety harpsichord.  No ebb and flow to the music!  No "life".  Or you could call it a lack of "soul".