Key Differences

The driver size differs between the two (45 mm vs 38 mm), which can influence sound depth, bass response, and overall audio clarity. There is a noticeable difference in weight (388 g vs 260 Gm), which may affect comfort during extended use. Overall, both headphones are feature-rich and cater to users looking for a combination of sound quality, comfort, and wireless convenience. Impedance levels vary (250 Ohms vs 300 ohm), which can affect compatibility and audio output when used with different devices. Beyerdynamic DT 1770 PRO and Sennheiser HD 660S2 offer different noise cancellation capabilities (NA vs AMBIENT), which can impact how effectively they block external noise. If you're comparing Beyerdynamic DT 1770 PRO and Sennheiser HD 660S2, both models offer a strong combination of sound performance, comfort, and modern wireless features. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. The frequency response differs (5 Hz - 40000 Hz vs 8 Hz -41500 Hz), which can influence how well the headphones reproduce lows, mids, and highs. Both headphones offer solid battery performance, making them suitable for long listening sessions and travel.

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