Sennheiser RS-120 vs ACwO Decibel – Which Headphones Are Better? (2026)

Up To 35 dB Active Noise Cancellation : Experience crystal-clear sound flowing seamlessly, With Active Noise Cancellation up to 35dB, Decibel creates a personalized sound sanctuary wherever you roam. Comfortable To Wear : Juggling work calls, workouts, and unwinding with music? No problem. Advanced True Wireless Stereo (TWS) technology ensures a rock-solid connection that effortlessly adapts to your day. Type-C Charging Case: Forget about scrambling for a charger ever again. These earbuds boast lightning-fast charging HYPER BOOST Technology. A quick power-up for just 15 minutes fuels 15 hours of listening, so you can ditch the outlet and get back to your music without missing a beat. No Compromise On Audio Quality : Forget compressed audio and frustrating dropouts. SBC and AAC codec support guarantee crystal-clear, lossless playback across all your devices. Immerse yourself in every nuance of your music, movies, and podcasts, exactly as the artist or creator intended. Crystal-Clear Voice Calls With 4 ENC Mics : Background noise is no longer a concern. With 4 built-in Environmental Noise Cancellation (ENC) mics and advanced processing technology, these earbuds ensure your voice is transmitted with perfect clarity during calls, regardless of the environment. Non-Stop Playtime UpTo 60 Hours : Leave the charger behind and embark on extended listening adventures. A single charge delivers a whopping 60 hours of playback, so you can listen from sunrise to sunset (and beyond) without worry. Even a quick minute of charging fuels hours of listening, ensuring the music never stops. Deep Bass, Deeper Connection : Experience music like never before. High-fidelity audio with a tetanized diaphragm delivers rich, layered tones and crystal-clear highs, bringing your favorite songs to life with unparalleled detail. Imagine the thundering drums, the soaring vocals, the intricate melodies - every element of the music is reproduced with stunning clarity and precision.

Key Differences

Impedance levels vary (24 ohms vs 140 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. In general, both options are suitable for everyday use including music, calls, travel, and work-from-home scenarios. The driver size differs between the two (NA vs 13 mm), which can influence sound depth, bass response, and overall audio clarity. The frequency response differs (22 - 19500 Hz vs 20Hz - 20KHz), which can influence how well the headphones reproduce lows, mids, and highs. There is a noticeable difference in weight (230 g vs 40 GM), which may affect comfort during extended use. Sennheiser RS-120 and ACwO Decibel offer different noise cancellation capabilities (No vs Active Noise Cancelling), which can impact how effectively they block external noise. Battery life varies between the two (20 - 25 hrs vs 60 Hours), which affects how long you can use them on a single charge. Sennheiser RS-120 and ACwO Decibel are well-known options in the wireless headphone segment, offering a balance of audio quality, battery performance, and smart features.

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

Top Differences

Battery Life: 20 - 25 hrs vs 60 Hours
Noise Cancelling: No vs Active Noise Cancelling
Driver Size: NA vs 13 mm
Weight: 230 g vs 40 GM
Impedance: 24 ohms vs 140 Ohms

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Key Differences

Top Differences