Impedance levels vary (32 Ohms vs 64 Ohms), which can affect compatibility and audio output when used with different devices. The frequency response differs (20 Hz-20,000 Hz vs 8 Hz - 25000 Hz), which can influence how well the headphones reproduce lows, mids, and highs. There is a noticeable difference in weight (380 g vs 220 g), 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. If you're comparing Sennheiser HD-451 and Sennheiser HD 280 Pro, both models offer a strong combination of sound performance, comfort, and modern wireless features. Sennheiser HD-451 and Sennheiser HD 280 Pro offer different noise cancellation capabilities (Yes vs NA), which can impact how effectively they block external noise. Overall, both headphones are feature-rich and cater to users looking for a combination of sound quality, comfort, and wireless convenience. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. Both headphones offer solid battery performance, making them suitable for long listening sessions and travel.

Verdict: Both models are competitive, and your decision should be based on your usage needs and preferred features.