Key Differences

Impedance levels vary (250 ohm vs 300 ohm), which can affect compatibility and audio output when used with different devices. 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. Beyerdynamic DT 1770PRO and Sennheiser HD 660S2 are well-known options in the wireless headphone segment, offering a balance of audio quality, battery performance, and smart features. Both headphones offer solid battery performance, making them suitable for long listening sessions and travel. There is a noticeable difference in weight (388 g vs 260 Gm), which may affect comfort during extended use. In general, both options are suitable for everyday use including music, calls, travel, and work-from-home scenarios. Beyerdynamic DT 1770PRO and Sennheiser HD 660S2 offer different noise cancellation capabilities (NA vs AMBIENT), which can impact how effectively they block external noise. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. The driver size differs between the two (45 mm vs 38 mm), which can influence sound depth, bass response, and overall audio clarity.

Verdict: Choosing between Beyerdynamic DT 1770PRO and Sennheiser HD 660S2 depends on whether you value better sound, longer battery life, or enhanced features.