Key Differences

Impedance levels vary (100 ohms (when noise cancelling function is used) vs 70 Ohms), which can affect compatibility and audio output when used with different devices. Audio Technica ATH-ANC9 and Sennheiser HD 25-1 II offer different noise cancellation capabilities (Yes (Reduces Noise up to 30 dB) vs NA), which can impact how effectively they block external noise. Both headphones offer solid battery performance, making them suitable for long listening sessions and travel. Audio Technica ATH-ANC9 and Sennheiser HD 25-1 II are well-known options in the wireless headphone segment, offering a balance of audio quality, battery performance, and smart features. The frequency response differs (10 - 25,000Hz vs 16 Hz - 22,000 Hz), which can influence how well the headphones reproduce lows, mids, and highs. There is a noticeable difference in weight (220 g (Inclusive of Battery and Cable) vs 140 g), which may affect comfort during extended use. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. The driver size differs between the two (40 mm vs NA), which can influence sound depth, bass response, and overall audio clarity. In general, both options are suitable for everyday use including music, calls, travel, and work-from-home scenarios.

Verdict: Choosing between Audio Technica ATH-ANC9 and Sennheiser HD 25-1 II depends on whether you value better sound, longer battery life, or enhanced features.