Sennheiser CX SPORT vs Sony WH-RF400 – Key Differences & Best Choice (2026)

Sweat and splash resistant, designed to compliment your workout activities. Bluetooth 4.2 with multi-point connectivity allows pairing with eight (8) devices and simultaneous connection with two (2) devices. Sennheiser proprietary transducers, designed and engineered in Germany, deliver balanced and detailed sound with dynamic bass capability. 6 hour battery life from a 1.5 hours charge, a 10-minute quick charge provides an additional 1 hour of battery life making sure the CX SPORT is ready to work out. A choice of four sizes (XS, S, M, L) of ear adapters and three sizes (S, M, L) of ear fins create a personalized fit for optimal wearing comfort and excellent passive reduction of external noise.

Comfortable fit. Smooth and Comfortable Earpads. High fidelity sound reproduction. 3 transmission channels available. Comfortable fitting ear pads and headband. 1.57" driver unit delivers a wide frequency range. Listen for longer with up to 20 hours of battery life. Noise reduction system reproduces a clearer sound. New mode â€œVOICEâ€ for clear hearing of personal voice range. Transmission distance varies depending on conditions of use. Automatic tuning on headphones for optimum signal reception. Requires use of RCA Audio Out or Headphone Jack on television. Volume control function and sound effect function on the headphones. Easy recharging function with secure charging mechanism â€“Rechargeable Battery. Wireless system that allows you to listen to a program free the restriction of a cable. Noise reduction system to reproduce a clear sound with minimum transmission noise.

Key Differences

The driver size differs between the two (10 mm vs 40 mm), which can influence sound depth, bass response, and overall audio clarity. Battery life varies between the two (6 Hours vs 20 Hours), which affects how long you can use them on a single charge. Impedance levels vary (28 ohm vs 32 ohm), which can affect compatibility and audio output when used with different devices. In general, both options are suitable for everyday use including music, calls, travel, and work-from-home scenarios. The frequency response differs (17 Hz - 21000 Hz vs 10 Hz - 22,000 Hz), which can influence how well the headphones reproduce lows, mids, and highs. There is a noticeable difference in weight (15.07 gm vs 275 Gm), which may affect comfort during extended use. Both models feature noise cancellation, helping reduce background noise for a more immersive listening experience. If you're comparing Sennheiser CX SPORT and Sony WH-RF400, both models offer a strong combination of sound performance, comfort, and modern wireless features. Sennheiser CX SPORT uses Bluetooth 4.2 while Sony WH-RF400 supports Bluetooth 5.0, which can impact connectivity stability and efficiency.

Verdict: Choosing between Sennheiser CX SPORT and Sony WH-RF400 depends on whether you value better sound, longer battery life, or enhanced features.

Top Differences

Battery Life: 6 Hours vs 20 Hours
Driver Size: 10 mm vs 40 mm
Bluetooth: 4.2 vs 5.0
Weight: 15.07 gm vs 275 Gm
Impedance: 28 ohm vs 32 ohm

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Key Differences

Top Differences