Sennheiser MM 30i vs Sennheiser CX 686G – Specs, Price & Comparison (2026)

- Smart in-line remote control with microphone â€“ change the volume, control your music-playing options, answer or end calls and activate Voice Control â€“ all from a sleek built-in unit - Feel the beat â€“ thanks to bass-driven Sennheiser sound - Effective noise blocking â€“ ear-canal design for effective passive attenuation of ambient noise - Comfortable custom fit â€“ 3 sizes of ear sleeves (S/M/L) supplied - Made for the latest generations of iPod, iPhone and iPad* - 2-year warranty

- 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

Key Differences

Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. Both headphones are equipped with capable drivers that deliver balanced sound output suitable for music, calls, and entertainment. Both headphones offer solid battery performance, making them suitable for long listening sessions and travel. Both models feature noise cancellation, helping reduce background noise for a more immersive listening experience. There is a noticeable difference in weight (32 g vs NA), which may affect comfort during extended use. Overall, both headphones are feature-rich and cater to users looking for a combination of sound quality, comfort, and wireless convenience. Impedance levels vary (16 Ohms vs 20 Ohms), which can affect compatibility and audio output when used with different devices. Sennheiser MM 30i and Sennheiser CX 686G are well-known options in the wireless headphone segment, offering a balance of audio quality, battery performance, and smart features. The frequency response differs (17 Hz - 20000 Hz vs 18 Hz -20000 Hz), which can influence how well the headphones reproduce lows, mids, and highs.

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

Top Differences

Weight: 32 g vs NA
Impedance: 16 Ohms vs 20 Ohms

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Key Differences

Top Differences