There is a noticeable difference in weight (270 g vs 250 g), which may affect comfort during extended use. Beyerdynamic DT 770 PRO and Beyerdynamic DT 990 PRO are premium wireless headphones designed to deliver high-quality sound along with advanced features like noise cancellation and long battery life. Both headphones offer solid battery performance, making them suitable for long listening sessions and travel. Both models feature noise cancellation, helping reduce background noise for a more immersive listening experience. Impedance levels vary (32/80/250 Ohms vs 250 Ohms), which can affect compatibility and audio output when used with different devices. Both models provide a wide frequency range, delivering a balanced audio experience across different types of content. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. From a usability standpoint, both models provide a reliable and premium headphone experience. Both headphones are equipped with capable drivers that deliver balanced sound output suitable for music, calls, and entertainment.

Verdict: Choosing between Beyerdynamic DT 770 PRO and Beyerdynamic DT 990 PRO depends on whether you value better sound, longer battery life, or enhanced features.