The frequency response differs (20 Hz-20,000 Hz vs 16 Hz - 22000 Hz), which can influence how well the headphones reproduce lows, mids, and highs. Impedance levels vary (32 Ohms vs 60 Ohms), which can affect compatibility and audio output when used with different devices. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. Overall, both headphones are feature-rich and cater to users looking for a combination of sound quality, comfort, and wireless convenience. Sennheiser HD-451 and Koss R80 offer different noise cancellation capabilities (Yes vs NA), which can impact how effectively they block external noise. Sennheiser HD-451 and Koss R80 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. There is a noticeable difference in weight (380 g vs NA), which may affect comfort during extended use. Both headphones are equipped with capable drivers that deliver balanced sound output suitable for music, calls, and entertainment.

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