If you're comparing Beyerdynamic DT 1770 PRO and Beyerdynamic DT 1770PRO, both models offer a strong combination of sound performance, comfort, and modern wireless features. The frequency response differs (5 Hz - 40000 Hz vs 5 - 40 000 Hz), which can influence how well the headphones reproduce lows, mids, and highs. Both headphones are equipped with capable drivers that deliver balanced sound output suitable for music, calls, and entertainment. Both headphones offer solid battery performance, making them suitable for long listening sessions and travel. Both headphones are designed for comfort and can be used for extended listening sessions without major discomfort. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. Impedance levels vary (250 Ohms vs 250 ohm), which can affect compatibility and audio output when used with different devices. Both models feature noise cancellation, helping reduce background noise for a more immersive listening experience. From a usability standpoint, both models provide a reliable and premium headphone experience.

Verdict: Choosing between Beyerdynamic DT 1770 PRO and Beyerdynamic DT 1770PRO depends on whether you value better sound, longer battery life, or enhanced features.