Impedance levels vary (35 Ohms vs 40 ohm), which can affect compatibility and audio output when used with different devices. Koss Pro4s and SHURE SRH840A offer different noise cancellation capabilities (NA vs CVC), which can impact how effectively they block external noise. The frequency response differs (10 Hz - 25000 Hz vs 5 Hz - 25000 Hz), 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. There is a noticeable difference in weight (NA vs 273 Gm), which may affect comfort during extended use. Koss Pro4s and SHURE SRH840A 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. Both headphones are equipped with capable drivers that deliver balanced sound output suitable for music, calls, and entertainment.

Verdict: Choosing between Koss Pro4s and SHURE SRH840A depends on whether you value better sound, longer battery life, or enhanced features.