The frequency response differs (6 Hz - 51000 Hz vs 5Hz - 40KHz), which can influence how well the headphones reproduce lows, mids, and highs. Sennheiser HD 800 and Beyerdynamic DT 1990 PRO MKII 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. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. The driver size differs between the two (NA vs 45 mm), which can influence sound depth, bass response, and overall audio clarity. Both models feature noise cancellation, helping reduce background noise for a more immersive listening experience. In general, both options are suitable for everyday use including music, calls, travel, and work-from-home scenarios. Impedance levels vary (300 Ohms vs 30 ohm), which can affect compatibility and audio output when used with different devices. There is a noticeable difference in weight (Approx 330 g vs 376 GM), which may affect comfort during extended use.

Verdict: Choosing between Sennheiser HD 800 and Beyerdynamic DT 1990 PRO MKII depends on whether you value better sound, longer battery life, or enhanced features.