Check the listing for details. Beyerdynamic DT 990 Pro X Studio Headphones - Black. Color: Black, Condition: New. Listed at 199.99 USD. Beyerdynamic's Sonic Legacy Reimagined Constituting a classic reimagined, Beyerdynamic DT 990 Pro X headphones meld the legendary sonic signature of the DT 990 Pro with the flexibility of the dynamic Stellar.45 driver system. Ideal for the studio, these headphones boast an open-back design, delivering a superbly detailed, delightfully airy sound with a natural high-end lift and incredible transparency — exactly what you need to reveal the hidden nuances of your mixes. Moreover, the DT 990 Pro X headphones operate at an ultra-low impedance rating, making them suitable for a variety of critical listening applications. Each pair comes with a detachable 3-meter connector cable, a 3.5mm jack adapter, and a rugged drawstring bag, ensuring easy travel and transport of your gear.