Soundcore Liberty 4 NC or CMF Buds Pro 2? Which has better ANC?
For active noise cancellation, the Soundcore Liberty 4 NC has the stronger overall case. Its Adaptive ANC 2.0 adjusts to your ears and surroundings, and independent testing found it effective at reducing traffic and public-transit noise. The CMF Buds Pro 2 also offer impressive ANC, especially for low-frequency sounds, but the Liberty 4 NC is the better pick when noise blocking is your main priority.
The Soundcore Liberty 4 NC and CMF Buds Pro 2 are both affordable wireless earbuds with active noise cancellation, adaptive modes, and app-based controls. On paper, both make strong claims about how much outside noise they can reduce.
That can make the choice confusing. Soundcore advertises up to 98.5% noise reduction, while CMF lists up to 50 dB of hybrid ANC. Those numbers are measured and marketed in different ways, so they should not be treated as a direct head-to-head measurement.
For this comparison, the more useful question is how the two earbuds handle everyday noise such as traffic, buses, trains, office sounds, and general background noise.
How the ANC Systems Compare
The Liberty 4 NC uses Adaptive ANC 2.0. Soundcore says the system uses internal and external sensors to monitor noise and adjust cancellation in real time. The earbuds also provide manual ANC levels and additional controls through the Soundcore app.
The CMF Buds Pro 2 uses hybrid ANC up to 50 dB. Its adaptive mode can adjust noise cancellation based on the environment, and the Nothing X app provides High, Mid, Low, and Adaptive settings. CMF also says the earbuds can compensate for noise leakage caused by the fit.
| ANC feature | Soundcore Liberty 4 NC | CMF Buds Pro 2 |
|---|---|---|
| ANC system | Adaptive ANC 2.0 | Hybrid ANC |
| Claimed maximum | Up to 98.5% noise reduction | Up to 50 dB |
| Adaptive mode | Yes | Yes |
| App controls | Soundcore app | Nothing X app |
| Manual ANC adjustment | Yes | Yes |
| Wind reduction | Yes | Available through ANC controls |
| Best use | Stronger overall noise blocking | Strong budget ANC |
| Available |  | |
The important point is that 98.5% and 50 dB are not directly comparable numbers. A percentage reduction and a decibel reduction use different measurement methods, so choosing a winner from those marketing figures alone would be misleading.
Which Has Better ANC in Real-World Use?
The Liberty 4 NC has the edge when the goal is maximum everyday noise reduction.
SoundGuys found the Liberty 4 NC effective at reducing traffic and public-transit noise. Its adaptive system can also change the ANC level based on the environment, while manual settings give you more control if you prefer to adjust the strength yourself.
The CMF Buds Pro 2 performs well too. SoundGuys measured strong low-frequency noise reduction and found it effective against traffic and general background noise. However, higher-pitched sounds such as some vehicle noises and horns can remain more noticeable.
This difference matters because ANC is generally most useful against steady, low-frequency sounds. Engine rumble, air-conditioning noise, buses, and train noise are easier for ANC systems to reduce than sudden voices, sharp horns, or other high-frequency sounds.
On a Bus or Train
If you commute by bus or train, the Liberty 4 NC is the better fit for a noise-focused buyer. Its ANC has been specifically praised for handling traffic and public-transit noise, which are common situations where strong low-frequency cancellation matters.
The CMF Buds Pro 2 is still capable here. Its testing showed strong attenuation of low-frequency sounds, so you should notice a meaningful reduction in engine and road noise.
The difference is that the Liberty 4 NC gives you more ANC adjustment options, which can be useful when the surrounding noise changes during a commute.
In an Office or Coffee Shop
Both earbuds can reduce steady background noise, but neither should be expected to make conversations disappear completely.
The Liberty 4 NC combines ANC with passive isolation, although SoundGuys noted that some voices and higher-frequency sounds can still get through because the earbuds do not isolate as deeply as some alternatives.
The CMF Buds Pro 2 also works well for general background noise. Its ANC was found to reduce low-frequency environmental sounds effectively, while its transparency mode can help when you need to hear people around you.
Why Ear Tip Fit Matters More Than the Numbers Suggest
ANC performance is not just about the electronics inside the earbuds. The physical seal between the ear tip and your ear canal also matters.
If the ear tip does not seal properly, outside sound can enter around the earbud. This can make even strong ANC feel weak.
Nothing specifically recommends trying different ear-tip sizes when ANC performance is poor because an improper fit can reduce the effectiveness of the noise-canceling seal.
That means a person may have a better experience with the CMF Buds Pro 2 if it fits their ears better, even though the Liberty 4 NC has the stronger overall ANC case.
For either model, try the included ear tips and choose the size that creates a secure seal without feeling uncomfortable.
What About the ANC App Controls?
The Liberty 4 NC has a particularly flexible ANC control system. The Soundcore app includes adaptive ANC, multiple manual noise-cancellation levels, and wind reduction. It also provides transportation-specific ANC options.
The CMF Buds Pro 2 uses the Nothing X app and offers High, Mid, Low, and Adaptive ANC settings. The case also has CMF’s Smart Dial, which can be used for several controls, including noise cancellation.
If you like adjusting ANC for different situations, the Liberty 4 NC gives you more control.
If you prefer a simpler setup with a distinctive physical control on the case, the CMF Buds Pro 2 has an interesting advantage.
Does the 50 dB CMF Claim Mean It Has Better ANC?
No. The CMF Buds Pro 2’s 50 dB ANC claim does not automatically mean it cancels more noise than the Liberty 4 NC.
CMF’s 50 dB figure describes the maximum noise reduction claimed by its hybrid ANC system. Soundcore instead advertises up to 98.5% noise reduction for the Liberty 4 NC. These figures use different ways of describing ANC performance, so they should not be compared as if 50 is simply better or worse than 98.5.
Independent testing is more useful when comparing actual performance. RTINGS currently compares both models and lists ANC among their measured characteristics, while its overall comparison gives the Liberty 4 NC the edge across several areas.
Battery Life Can Matter for ANC Users
If you frequently use ANC for long periods, battery life is worth considering.
Soundcore rates the Liberty 4 NC for up to 10 hours on the earbuds and 50 hours with the charging case, with the exact runtime depending on settings and use.
The CMF Buds Pro 2 is rated for up to 43 hours with the case, while independent testing found around 6 hours and 15 minutes of continuous playback with ANC enabled.
This does not make battery life an ANC feature, but it can affect the experience. Someone who uses noise cancellation throughout a long workday or commute may appreciate the Liberty 4 NC’s longer rated total battery life.
Which One Should You Choose for ANC?
If your main question is simply which has better ANC, the Soundcore Liberty 4 NC is the stronger choice.
Its main advantages are its effective noise cancellation in common travel situations, adaptive ANC system, manual adjustment options, and long battery life. Independent testing also supports its ability to reduce traffic and public-transit noise.
The CMF Buds Pro 2 is still a strong option if you want good ANC at a lower budget. Its noise cancellation is particularly effective against low-frequency background sounds, and it adds features such as the Smart Dial, IP55 protection, and a dual-driver design.
| If you care most about… | Better fit |
|---|---|
| Stronger overall ANC | Soundcore Liberty 4 NC |
| Traffic and transit noise | Soundcore Liberty 4 NC |
| More ANC adjustment options | Soundcore Liberty 4 NC |
| Long battery life | Soundcore Liberty 4 NC |
| Strong budget ANC | CMF Buds Pro 2 |
| Low-frequency noise reduction | Both are capable |
| IP55 water and dust resistance | CMF Buds Pro 2 |
| Smart Dial controls | CMF Buds Pro 2 |
Frequently Asked Questions
Still deciding between the Soundcore Liberty 4 NC and CMF Buds Pro 2? These common questions cover the key ANC differences, the 50 dB claim, and which earbuds may work better for travel and everyday noise.
Is Soundcore Liberty 4 NC better than CMF Buds Pro 2 for ANC?
Yes, the Liberty 4 NC has the stronger overall ANC performance based on independent comparisons and testing. The CMF Buds Pro 2 still provides effective noise reduction, particularly against low-frequency background noise.
Does CMF Buds Pro 2 really have 50 dB ANC?
CMF rates the Buds Pro 2 for up to 50 dB of hybrid active noise cancellation. That figure is a manufacturer claim and should not be directly compared with Soundcore’s percentage-based noise-reduction claim because the measurement descriptions are different.
Which is better for airplane or public-transit noise?
The Liberty 4 NC is the better choice if blocking travel noise is your main goal. Independent testing found it effective against traffic and public-transit noise, while the CMF Buds Pro 2 also performs well with low-frequency environmental sounds.
Final Verdict
For a buyer choosing specifically for ANC performance, the Soundcore Liberty 4 NC has the edge over the CMF Buds Pro 2. The CMF model is not far behind in everyday use, especially with steady low-frequency noise, but the Liberty 4 NC offers a stronger overall ANC package and more ways to control it.
One practical tip: don’t judge ANC by the advertised dB or percentage number alone. Fit the earbuds correctly, test them with the type of noise you actually deal with, and compare the experience in the places where you plan to use them most.
