The frequency response differs (5 - 40,000 Hz vs 12 Hz - 38500 Hz), which can influence how well the headphones reproduce lows, mids, and highs. Overall, both headphones are feature-rich and cater to users looking for a combination of sound quality, comfort, and wireless convenience. Impedance levels vary (48 ohm vs 50 ohm), which can affect compatibility and audio output when used with different devices. There is a noticeable difference in weight (345 g vs 250 Gm), which may affect comfort during extended use. If you're comparing Beyerdynamic DT 900 PRO X and Sennheiser HD 599, 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. Both headphones offer solid battery performance, making them suitable for long listening sessions and travel. Beyerdynamic DT 900 PRO X and Sennheiser HD 599 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.

Verdict: Both headphones offer strong performance, and the right choice depends on your priorities such as battery life, comfort, and noise cancellation.