Beyerdynamic DT770 PRO closed back headphone in the easier to drive 32 ohm impedance version. The 32 ohm Pro version has vinyl pads, an all black finish and a shorter 5ft cable. DT770 has a bass reflex design for improved bass response with excellent clarity. A classic studio monitor design with soft headband & deep ear pads for great comfort.
The easiest DT770 to drive, the 96 db sensitivity is still a bit low, making these a good match for a dac/amp. The new Fiio K3 makes an excellent affordable combo.