Hi, I have the Signature Pro and am very very happy with this headphone ! The most natural sound that I ever experimented with Ultrasone. I tried in the past the 880, but was annoyed by the bass, and the mids were a little special, not as natural and warm than the 840. I'm very interesting...

Actually, the problem is not the treble !  The treble of the K612 is right, may be too smooth for me, even !   But this is the female vocales that I don't very like sometimes, with a pic at 2.5-3Khz.  If the treble of the K400 has much better intensity and clarity, and if it's not too...

Hi !   I'm very interesting by the K400, because of its wonderful midrange, according what I can read about it. But I have the K612, and I find it to be sometimes « splashy » in the Upper-mids, more especially between 1-4Khz, where the female voices can become acidic, agressive (the « iiii »...

Hi !   I have the Performance 820, it's a heavy-bass headphone, with well-prononced sub-bass.  There is a little sibilance, but it's not very harsh yet.  Just be carefuly with its treble, because of its good attack !  Otherwise, I think it has the same characteristics than the 840, at the...

Thank you for the comparison  !   Compared to AKG K545, did you find that K601 seemed to be more agressive and sibilant ?  Or the Treble and Medium quantify is the same ? Otherwise, the soundstage is really bigger compared to K545, or it plays in the same league ?     Thanks to others...

Hi everyone !   I'm very interesting by the 612, but I red that this one could sound agressive, sibilant and bass-light.  I have an AKG K545 that I love, and I would know if the 612 offer as many basses ? I also had a Q701 for a moment, and I found it to be very bass-light and totally lacking...