BTW, if I remember correctly T90 has 250 ohm impedance, you may want to get a proper amp for it. I once tried plugging it directly to my phone and it sounds pretty bad. Driven by the Hugo, it suddenly become totally different.

T90 is the one that I spend the most time with, among the three HPs I currently keep. Driven by the Hugo, compared with the Grado PS500, T90 has much larger soundstage and thus better instrument separation. I appreciate this a lot. Compared with the HD800, T90 is not as detailed, neutral as the...

This is Alan located in SF bay area. I love playing with headphones, and have a small collection at home, they include an HD800, a Grado PS500 and a Beyer T90, I use Chord Hugo as both DAC and AMP. Nice to finally become a member of this forum !