The frequency response differs (5 Hz - 35000 Hz vs 10 Hz - 25000 Hz), which can influence how well the headphones reproduce lows, mids, and highs. Impedance levels vary (32/80/250 Ohms vs 250 Ohms), which can affect compatibility and audio output when used with different devices. Beyerdynamic DT 770 PRO and Koss PRO-4AA are well-known options in the wireless headphone segment, offering a balance of audio quality, battery performance, and smart features. Both models feature noise cancellation, helping reduce background noise for a more immersive listening experience. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. 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. There is a noticeable difference in weight (270 g vs NA), which may affect comfort during extended use. 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 Koss PRO-4AA depends on whether you value better sound, longer battery life, or enhanced features.