Key Differences

Impedance levels vary (250 ohm vs 300 ohm), which can affect compatibility and audio output when used with different devices. Both headphones offer solid battery performance, making them suitable for long listening sessions and travel. Beyerdynamic DT 1770PRO and Sennheiser HD 660S2 are premium wireless headphones designed to deliver high-quality sound along with advanced features like noise cancellation and long battery life. From a usability standpoint, both models provide a reliable and premium headphone experience. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. Beyerdynamic DT 1770PRO and Sennheiser HD 660S2 offer different noise cancellation capabilities (NA vs AMBIENT), which can impact how effectively they block external noise. The driver size differs between the two (45 mm vs 38 mm), which can influence sound depth, bass response, and overall audio clarity. The frequency response differs (5 - 40 000 Hz vs 8 Hz -41500 Hz), which can influence how well the headphones reproduce lows, mids, and highs. There is a noticeable difference in weight (388 g vs 260 Gm), which may affect comfort during extended use.

Verdict: Both models are competitive, and your decision should be based on your usage needs and preferred features.