these are real detail monsters! Extremely clean smooth clear highs and mids BUT I found you NEED a good pure copper cable to bring the low end up . They have a definite character which makes them a winner or not depending on your preference. If details are your thing then they are amazing. They will however show up ANY issues with the recording, meaning with the highest quality recorded and mastered albums the T4's shine with a reference high/mids quality. Sometimes hiss is there but that is the trade off with such detail.