Sennheiser RS 175 vs Sennheiser MM 400-X – Full Comparison & Verdict (2026)

- Closed, circumaural headphones with excellent digital wireless audio transmission - Exceptional digital audio clarity and transmission range of up to 328ft/100m (line of sight) - Enables switching between dynamic bass and virtual surround sound listening modes for situational sound customization - Supports analog and digital audio inputs and allows toggling between the inputs - Intelligently designed controls for maximum ease of use - Multi-purpose transmitter â€“ also functions as â€˜easy-chargeâ€™ cradle and docking station - Multi-receiver transmission â€“ transmitter supports up to two pairs of headphones simultaneously - Ergonomic design for enhanced wearing comfort - 2-year warranty System Features - Range : Up to 100 m - Signal-to-noise ratio : Analog input: typ. 85 dBA at 1 Vrms : Digital input: > 90 dBA - Modulation : 8-FSK Digital - Carrier frequencies : 2.4 â€“ 2.48 GHz

- CD quality audio â€“Featuring the apt-XÂ® codec, the headsets can connect wirelessly to any BluetoothÂ® apt-XÂ® enabled devices, such as the new Apple computers and selected Creative and Samsung music products - Wireless freedom â€“ BluetoothÂ® 2.1 guarantees hands-free convenience without wires and the advanced A2DP profile for Stereo BluetoothÂ® delivers optimized hi-fi stereo sound - Invisible microphone â€“ with high-performance sound quality for clear conversations - Direct cable option â€“ for use on airplanes, with an airline adapter included - Easy headset controls â€“ in one intuitive cluster - Sennheiser sound quality â€“ hi-fi headphone drivers ensure superior dynamic range, detail and excellent bass - Wearing comfort â€“ padded ear-cushions provide an excellent soft fit, even on long trips - Easy-2-GO â€“ the headset folds into a compact bundle for travel and storage, while the headband is metal-reinforced for durability - Flexible â€“ replace the battery with a s

Battery life varies between the two (18 Hrs vs 10 Hrs music, 20 Hrs talktime), which affects how long you can use them on a single charge. If you're comparing Sennheiser RS 175 and Sennheiser MM 400-X, both models offer a strong combination of sound performance, comfort, and modern wireless features. Both models feature noise cancellation, helping reduce background noise for a more immersive listening experience. Both headphones are equipped with capable drivers that deliver balanced sound output suitable for music, calls, and entertainment. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. There is a noticeable difference in weight (310 g vs 105 g), which may affect comfort during extended use. The frequency response differs (17 Hz - 22,000 Hz vs 15 Hz - 22000 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.

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

Top Differences

Battery Life: 18 Hrs vs 10 Hrs music, 20 Hrs talktime
Weight: 310 g vs 105 g

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Top Differences