The frequency response differs (3 - 100,000Hz vs 10 Hz - 23000 Hz), which can influence how well the headphones reproduce lows, mids, and highs. The driver size differs between the two (40mm Dynam vs NA), which can influence sound depth, bass response, and overall audio clarity. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. Both models feature noise cancellation, helping reduce background noise for a more immersive listening experience. Impedance levels vary (24 Ohms vs 32 Ohms), which can affect compatibility and audio output when used with different devices. There is a noticeable difference in weight (225 g vs 174 g), which may affect comfort during extended use. Both headphones offer solid battery performance, making them suitable for long listening sessions and travel. From a usability standpoint, both models provide a reliable and premium headphone experience. If you're comparing Sony MDR-1A-B and Beyerdynamic T 51 P, both models offer a strong combination of sound performance, comfort, and modern wireless features.

Verdict: Choosing between Sony MDR-1A-B and Beyerdynamic T 51 P depends on whether you value better sound, longer battery life, or enhanced features.