Sennheiser CX 686G vs Sony MDR-EX31BN – Key Differences & Best Choice (2026)

- Inline smart remote and mic on the cable are compatible with most smartphones and portable players (including Android, Windows Mobile and Blackberry devices) - Maximum ruggedness and durability â€“ Sweat and water-resistant - Sealed in-ear-canal design for improved blocking of outside noise - Antimicrobial ear adapters (SteriTouch) - Slide-to-fit system is fully adjustable for an individualized fit - Para-aramid-reinforced cable provides superior strength and reliability - Oval-shaped cable ensures a tangle-free listening experience and reduced cable noise - Convenient storage pouch and cable clip included - 2-year warranty

- Wireless Stereo Dynamic In-Ear Headset - 13.5mm high sensitivity driver - Hybrid silicone rubber earbuds (S,M,L) supplied fitting and long-term wearing comfort - Bluetooth Power Class2, Noise Cancelling set Bluetooth - Output :- Bluetooth power class2 - Maximum Communication Range :- Line of sight approx. 30ft (10m) - Frequency Band :- 2.4GHz band (2.4000GHz-2.4835GHz) Microphone - Unit/Type :- Electret Condenser - Directivity :- Omnidirectional Microphone - Frequency Range :- 100Hz - 4,000Hz General - Type :- Closed, dynamic - Power Source / Battery Type :- Built-in Li-ion Rechargeable Battery - Battery Life :- (NC ON) Approx. 9.0 Hours, (NC OFF) Approx. 10.5 Hours - Battery Charging Time :- Approx. 2.5 Hours

Key Differences

Impedance levels vary (16 ohm (1KHz) vs 20 Ohms), which can affect compatibility and audio output when used with different devices. Sony MDR-EX31BN and Sennheiser CX 686G offer different noise cancellation capabilities (Yes vs NA), which can impact how effectively they block external noise. The frequency response differs (20 - 20,000Hz vs 18 Hz -20000 Hz), which can influence how well the headphones reproduce lows, mids, and highs. The driver size differs between the two (13.5mm vs NA), which can influence sound depth, bass response, and overall audio clarity. Both headphones offer solid battery performance, making them suitable for long listening sessions and travel. 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. There is a noticeable difference in weight (Approx 34g vs NA), which may affect comfort during extended use. If you're comparing Sony MDR-EX31BN and Sennheiser CX 686G, both models offer a strong combination of sound performance, comfort, and modern wireless features.

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

Top Differences

Noise Cancelling: Yes vs NA
Driver Size: 13.5mm vs NA
Weight: Approx 34g vs NA
Impedance: 16 ohm (1KHz) vs 20 Ohms

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Key Differences

Top Differences