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

Key Differences

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. Sennheiser RS 175 and Sennheiser MM 400-X are premium wireless headphones designed to deliver high-quality sound along with advanced features like noise cancellation and long battery life. Both models feature noise cancellation, helping reduce background noise for a more immersive listening experience. In general, both options are suitable for everyday use including music, calls, travel, and work-from-home scenarios. Both headphones are equipped with capable drivers that deliver balanced sound output suitable for music, calls, and entertainment. 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. 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.

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

Top Differences

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

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Key Differences

Top Differences