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.

smoky20404-24-2018 1:03am

dayglow Details Discussions Posts This discussion Message User 2,012 posts 05-02-2018 at 12:49pm Copy Comment URL Report Comment Edit Delete I equate "soul" being the human element of sound reproduction almost exclusively regarding vocal reproduction.