Roland68
Major Contributor
The K812 must be adjusted very precisely and should not be too tight, as it was developed as a work headset and is also very well ventilated.I had the AKG K812 and they had far to little clamp.
Otherwise... sibilance issue. Then somewhat okay.
As for the sibilance, it must be said that the K812 is the opposite of most headphones, it forgives absolutely nothing, neither in the music material nor in the device, and is absolutely merciless and unsparing to the music material. If there is a sibilance somewhere, you will hear it.
That is exactly why it is one of my favorite headphones, especially when comparing devices and wearing them for hours.
If these characteristics bother you, I can highly recommend the Fostex T60RP.