Frequency response of the Fidelio L1, in left (blue trace) and right (red trace) channels, level referenced to 94 dB @ 500 Hz.
The frequency response measurements reveal nothing terribly unusual: a bass peak at 50 Hz, a midrange peak at 2.7 kHz, and a small treble peak at 7.8 kHz. This is a pretty standard response curve for a good over-ear headphone, the only thing unusual is that the midrange peak is a little stronger than we usually see.
