Let me share my impressions having tested a great model of over ear headphones with an open back Beyerdynamic DT 1990 Pro. These are wired headphones of German production. They are declared to be a great choice for neutral listening that makes them good for both professionals and music fans. Let’s see why.
Concluding from the Beyerdynamic DT 1990 Pro specs of frequency response these are really high-end headphones decent for critical listening with the field of ranges from 5Hz to 40KHz. The impedance of 250 Ohm suit mostly for professional audio receivers that corresponds to its intention. The sensitivity declared is 102 dB.
I love the open back headphones like Beyerdynamic DT 1990 PRO for its spacious soundstage and clear imaging around the scene. The highs are crystal and front together with a good bass. The midrange is placed a bit in a shadow to emphasize these ranges and it sounds harmonious.
The connection with a detachable cable of 3 m/9.8 ft is enough for the purpose of the open back type headphones as you will hardly use it out and on the go.
I respect the German production of Beyerdynamics for its build quality and materials. The headband may be adjusted to your head. Large cups feel very soft to touch with microfiber cushions. They are breathable for the open back. The cups do not fold. With the weight of 370 g/13 oz they are decent for long wearing. I should admit that they may feel tight for large heads.