http://www.innerfidelity.com/images/PhilipsFidelioL1.pdf
I did some reading into frequency graphs and wondered why I dig the sound as much as I do. But now it makes a lot of sense and actually impresses me.
The bass is very clean, dry and punchy - and it's peak is at very low 40 to 50 Hz! From then on it's a clean warm tilt down to 1000 Hz.There's no bass bleed, no hole in the mids, etc. Very harmonic.
I read that a peak in the 2kHz brings the voices up front, and that's exactly what the Fidelio does. I like that a lot! I think the Shure SE215 does the same.
The 5kHz dip seems to be normal and many headphones do that. I've heard that this frequency carries all the garbage information of music. I will try to boost it with an EQ some time and try to verify.
Lastly, highs are very well extended. For the price anyway.
Exactly! They will.
I have the L1 for over one month now and I can safely say that it is by far my favorite headphone I have heard yet. It's like a fun Ultrasone or Triple.Fi 10 tuned into serious musical reproduction and much better timbre. Amazing.