Some spikes in measurements can be artifacts of the measurement device itself. The Senn measurements are close to what I hear with the original ie800. Having said that, I've had two pairs of ie800 (bought one and returned it only to buy another pair which I still use regularly over two years later). The first sound initially sounded terrible (It's okay to say something doesn't sound good, twister6!). It had a strange BA-like sharp thin treble. I freed the driver with LOUD LOUD LOUD music for 24 hours. None of this useless 5,000,000 hours soft piano music. The peak disappeared. I found I could wear over-the-ear, which is recommended as it eliminates all microphonics. Now, with the ie800S, everyone can wear over-the-ear. @twister6, could you please try playing the ie800S overnight at a volume which is painful with the earphone held 1in (2.5cm) away from the ear? Could be fun!