CMF by Nothing Buds with 42dB Active Noise Cancellation

The CMF by Nothing Buds are true wireless earbuds with 42dB active noise cancellation, Ultra Bass 2.0 technology, and Dirac Opteo professional audio tuning. These earbuds deliver up to 8 hours of playback on a single charge and 35.5 hours total with the charging case, while four HD microphones with Clear Voice Technology ensure clear calls in noisy environments. The Nothing X app provides full control over sound profiles, ANC modes, and touch settings.

CMF by Nothing Buds with 42dB Active Noise Cancellation: Key Takeaways

• 42dB ANC depth across 2900Hz bandwidth for effective ambient noise reduction
• Ultra Bass 2.0 with Dirac Opteo tuning for balanced, immersive audio
• 35.5 hours total playtime with fast charging support
• 4 HD microphones with Clear Voice Technology trained on 30 million noise patterns
• Bluetooth 5.3 with 15-meter wireless range
• Nothing X app for sound customization, ANC modes, and Low Latency Mode

What Are the CMF by Nothing Buds?

The CMF by Nothing Buds are true wireless earbuds from the CMF sub-brand of Nothing, a consumer electronics company known for distinctive industrial design. These earbuds focus on two things that matter most to everyday listeners: effective noise cancellation and reliable audio quality at an accessible price point. The standout feature is the 42dB active noise cancellation with a 2900Hz bandwidth, which uses an external HD microphone to detect surrounding sound and an internal processor to generate reverse sound waves for cancellation. When you need to hear your surroundings, Transparency Mode bridges the gap without removing the earbuds.

The audio system pairs Ultra Bass 2.0 technology with professional tuning by Dirac Opteo, a name associated with room correction and acoustic optimization. The result is a sound profile that emphasises low-end punch while keeping mids balanced and highs clear — a combination that works well across music genres, podcast dialogue, and phone calls.

Active Noise Cancellation: How 42dB ANC Works

The CMF Buds implement feedforward and feedback noise cancellation simultaneously. An outward-facing microphone captures ambient noise, and the onboard processor generates an inverted waveform to neutralise it before it reaches your ear. The 2900Hz bandwidth means the system tackles a wide range of common noise sources — traffic rumble, air-conditioning hum, and cafe chatter — rather than just low-frequency drone.

Switching to Transparency Mode activates the same microphones but feeds the sound through instead of cancelling it, so you can hear announcements or hold a short conversation without pausing your audio. The Nothing X app lets you toggle between ANC On, ANC Off, and Transparency Mode, and it also supports wind Noise Cancellation to reduce turbulence noise during outdoor use.

Ultra Bass 2.0 and Dirac Opteo Audio Tuning

CMF Buds use Ultra Bass 2.0 technology as the core of their low-frequency reproduction. Rather than simply boosting bass through equaliser gain, the system works at a deeper level to enhance bass perception without distorting vocals or instruments. This matters for genres like hip-hop, electronic, and film soundtracks where low-end presence defines the listening experience.

Dirac Opteo tuning brings professional-grade acoustic calibration to the CMF Buds. Dirac is a Swedish audio technology company that supplies digital audio optimisation to automotive manufacturers and consumer electronics brands. Its Opteo platform corrects both frequency response and impulse response — the latter being a detail many consumer earbuds overlook — to produce a more natural, spacious sound than default factory tuning.

Within the Nothing X app, users can adjust the Ultra Bass level manually across five steps, fine-tuning the bass emphasis to match personal preference or the genre being played. These customisations are saved to the earbuds themselves, so they carry over when connected to a different source device.

Call Quality: 4 HD Microphones and Clear Voice Technology

The CMF Buds carry four HD microphones — two on each earbud — working with Clear Voice Technology to isolate speech during phone and video calls. The system was trained on a dataset of over 30 million noise samples covering wind, crowd noise, traffic, and indoor HVAC systems. During a call, the algorithm continuously separates the caller's voice from background sound, reducing the noise floor so the other party hears you clearly even on a busy street or a noisy commute.

This makes the CMF Buds a practical option for remote workers who take calls from home offices, cafes, or co-working spaces, as well as anyone who needs reliable hands-free communication while on the move.

Battery Life and Charging

CMF Buds deliver up to 8 hours of continuous playback on a single charge with ANC active. The charging case extends total playtime to 35.5 hours before both earbuds and case need recharging. Fast charging provides approximately 6 hours of playback from a 10-minute charge — useful for topping up before a short journey.

Charging the case uses a standard USB-C connection. The exact full-charge time depends on the charger used, but the case is compatible with any standard USB-C power source. Battery figures are measured under standard test conditions and may vary with volume level, ANC usage, and wireless environment.

Connectivity: Bluetooth 5.3 and the Nothing X App

Bluetooth 5.3 provides the wireless connection between the CMF Buds and your source device. This version of Bluetooth offers improved energy efficiency and more stable pairing than earlier revisions. The earbuds maintain a reliable connection at up to 15 metres in open air — more than enough for everyday use around a home or office. Both earbuds establish independent connections to the source, which supports seamless switching between mono mode (single earbud) and stereo mode without re-pairing.

The Nothing X app (available for iOS and Android) serves as the companion software for the CMF Buds. From the app you can:

• Switch between ANC On, ANC Off, and Transparency Mode
• Adjust the Ultra Bass level across five steps
• Customise touch controls for music playback, calls, and ANC switching
• Activate Low Latency Mode for gaming (automatically optimised when connected to a Nothing smartphone)
• Update firmware when new releases are available

On Nothing smartphones, Low Latency Mode engages automatically for supported games, reducing audio lag to a level more suitable for real-time gaming. On other Android devices, the mode can be enabled manually through the app.

Who Should Consider the CMF by Nothing Buds?

The CMF Buds are built for people who want capable noise cancellation and good sound quality without paying flagship prices. The combination of 42dB ANC, Dirac Opteo tuning, and a long battery life addresses three of the most common complaints with budget earbuds — weak noise blocking, muddy sound, and frequent recharging.

The Nothing X app adds meaningful value by giving users control over sound and ANC behaviour, rather than locking all settings behind a fixed factory profile. The four-microphone call system is a practical differentiator for anyone who spends significant time on voice or video calls.

If you prioritise over-ear comfort, the largest drivers, or the absolute highest ANC ratings, you will find those qualities in higher-priced options. But for true wireless earbuds under the ৳5,000 mark, the CMF Buds cover the essentials well and add the Nothing ecosystem as a bonus.

Use Cases

Commuting and Public Transport

The 42dB ANC depth handles the sustained low-frequency noise of buses, trains, and rickshaws well. Transparency Mode lets you hear platform announcements or a colleague speaking without removing the earbuds. The 8-hour single-charge battery covers most daily commutes without needing the case.

Work From Home and Office Calls

Four HD microphones with Clear Voice Technology make voices sound clearer on calls than many single-microphone earbuds. The Nothing X app lets you switch ANC modes quickly during video meetings, and the in-ear fit provides natural passive isolation even with ANC off.

Travel and Long-Haul Flights

With 35.5 hours total playtime, the CMF Buds can go several days between full charges during travel. The compact charging case fits easily in a pocket or carry-on bag. Bluetooth 5.3 with 15-metre range means you can keep your phone in your bag while moving around a hotel room or seat.

What's Included in the Box

• CMF by Nothing Buds (left and right earbuds)
• Charging case
• USB-C charging cable
• Additional ear tip sizes (small, medium, large)
• User manual and quick start guide