techPowerUp posted a review on the Sennheiser IE8 Earphones

IE8 is the name of a brand new earphone solution from Sennheiser. The Sennheiser IE8 boast a dynamic driver and an innovative bass adjustment feature that allows the user to tweak the bass response on the move. With a price of $400 they don't come cheap, but for an audiophile who is looking for the best sound quality possible, these might still be a very viable choice.

Sennheiser IE8 Earphones Review