I'm afraid i must disagree ... he-400 highs are proheminents and can hurt sensitive ears. My brain and ears needed two weeks to accustom. Highs aren't harsh but stay present and sparkly ( hi hat are proheminent and sibilance can appear too ) . Very very good can although but he-400 trebles are a sensitive issue ( many discussions about this point in he-400 thread) .
For Teraflame , i would better advice HD650 ( very relaxed highs ) or Fidelio X1 maybe ?