I always thought a touch of ssl bus compression can add a touch of "high fi whatever" if that's what you're asking.

Soundtoys Sie-Q high band has kind of a slope curve that adds a nice presence. Air band on the Maag EQ is well-liked (though I have no personal experience with it). Simultaneous boost/cut with a Pultec style EQ.

Other than that, can't really think of any "magic high fi whatever plugins" to be honest.