The Khan is, indeed, an IEM within a rare class - treble-rich without sounding overly harsh. I'm quite sensitive to treble, so I shy away from earphones with (poorly) boosted highs. With the Khan, however, I don't detect much sibilance. It's an IEM teeming with detail. Nevertheless, after repeated auditions, I have been unable to adjust to the Khan's relatively lean nature; I find myself reverting to the Encore and the K10 for my usual fix. Hence, I'm very excited with the arrival of the Tux 5. I'm sure it'll be a hybrid that's more suited to my tastes.