AcademicBarzo
100+ Head-Fier
Do you also notice a dark tone in the bass and low mids? Something which is not exaclty muddiness but which can be improved by decreasing low mids and upper bass with EQ?
There is a dark tone, consistent with many Sennheiser headphones, including the HD650s, which I also own. I don't EQ the headphones - just not something I've ever played with - but I do find the sound signature engaging with the majority of music. It is not an incisive and detailed listen, but it does track the beat of music well and manages to retain enough sparkle in the treble to be interesting. I would suggest there is a mild boost at the top of the treble frequencies, with a mild roll off below. That would explain the bit of spark, alongside the darker character. It is also clear that the mid bass is boosted, not the lower bass - presumably to give heft and thump. However, whatever has been done in tuning the midrange means that this is not an obvious V shaped sound.