The treble for me is,relatively speaking, completely smooth. There is a small dip at around 7.5 kHz and A small bump around 2 to 3 kHz. And maybe a small bump at 10 kHz . All of these are graphed by most graphing standards. But none of them are very large and can easily be corrected with eq for any user that has the correct depth and seal. but there are no significant dips or peaks for me. only the very very lowest sub bass is a low, say below 50hz.