The driver size differs between the two (53 mm vs 45 mm), which can influence sound depth, bass response, and overall audio clarity. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. Impedance levels vary (44 ohm vs 48 ohm), which can affect compatibility and audio output when used with different devices. Audio Technica ATH-A990Z and Beyerdynamic DT 770 PRO X offer different noise cancellation capabilities (Sound Isolation vs Ambient Noise Isolation), which can impact how effectively they block external noise. Both headphones offer solid battery performance, making them suitable for long listening sessions and travel. The frequency response differs (5Hz - 42KHz vs 5Hz - 40KHz), which can influence how well the headphones reproduce lows, mids, and highs. From a usability standpoint, both models provide a reliable and premium headphone experience. Audio Technica ATH-A990Z and Beyerdynamic DT 770 PRO X are well-known options in the wireless headphone segment, offering a balance of audio quality, battery performance, and smart features. There is a noticeable difference in weight (335 GM vs 305 GM), which may affect comfort during extended use.

Verdict: Choosing between Audio Technica ATH-A990Z and Beyerdynamic DT 770 PRO X depends on whether you value better sound, longer battery life, or enhanced features.