The frequency response differs (5 Hz - 40000 Hz vs 5Hz - 40KHz), which can influence how well the headphones reproduce lows, mids, and highs. Impedance levels vary (250 Ohms vs 30 ohm), which can affect compatibility and audio output when used with different devices. If you're comparing Beyerdynamic DT 1770 PRO and Beyerdynamic DT 1990 PRO MKII, both models offer a strong combination of sound performance, comfort, and modern wireless features. There is a noticeable difference in weight (388 g vs 376 GM), which may affect comfort during extended use. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. Both models feature noise cancellation, helping reduce background noise for a more immersive listening experience. Both headphones offer solid battery performance, making them suitable for long listening sessions and travel. In general, both options are suitable for everyday use including music, calls, travel, and work-from-home scenarios. Both headphones are equipped with capable drivers that deliver balanced sound output suitable for music, calls, and entertainment.

Verdict: Choosing between Beyerdynamic DT 1770 PRO and Beyerdynamic DT 1990 PRO MKII depends on whether you value better sound, longer battery life, or enhanced features.