OPPO Enco X4 Noise-Cancelling True Wireless Earphones Hands-On Review

October 23, 2026 16-minute read TDS REVIEW | OPPO Enco X4 noise-cancelling true wireless earphones experience. Lead author KingTsui, SSPAI author. From TDS Studio, bringing you a bit of audio-visual-related content; the podcast RKTALLK updates everywhere. WeChat official account TDS Studio. KingTsui KingTsui, SSPAI author. From TDS Studio, bringing you a bit of audio-visual-related content; the podcast RKTALLK updates everywhere. WeChat official account TDS Studio. Co-author KingTsui, SSPAI author. From TDS Studio, bringing you a bit of audio-visual-related content; the podcast RKTALLK updates everywhere. WeChat official account TDS Studio. KingTsui KingTsui, SSPAI author. From TDS Studio, bringing you a bit of audio-visual-related content; the podcast RKTALLK updates everywhere. WeChat official account TDS Studio.

From TDS Studio, bringing you a bit of audio-visual-related content; the podcast RKTALLK updates everywhere. WeChat official account TDS Studio.

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This article is TDS Studio's 33rd article on SSPAI, and again a first release across all platforms.

When we wrote about the Enco Free4 earlier, we mentioned the situation with the X3; at the time, it seemed that with the rise of mid-priced noise-cancelling TWS, the X3 no longer had such a big advantage, at least at the functional level. In the blink of an eye the X4 is released, and we bought it on day one again, to see whether it can offer some more progress compared to the X3.

Package & Accessories

Like the Free4, Clip2 and other products, the Enco X4's packaging still uses a similar white-based style, but this time a structure similar to a book's belly band has been added; after removing it, the box surface has an embossed pattern consistent with the belly band design, and the inner box is black, which fits our understanding of OPPO's flagship product line. The accessories are only three extra pairs of ear tips, with no charging cable included. Apart from the silicone filter mesh inside the sound outlet, the ear tip structure seems to have learned from Apple's experience and also uses a special silicone material with a foamed front end. This also makes its passive isolation performance slightly better than conventional stem-style TWS, while unlike fully foam ear tips it doesn't need to be pinched before wearing, and has relatively good durability.

Design, Fit & Acoustic Structure

The Enco X4 launches in three colors — Soft White, Titanium Gray, and Pink Gold; Soft White is a fairly conventional silver-and-white combination, while Pink Gold is a champagne gold leaning a bit more toward light pink. The Titanium Gray in our hands actually looks slightly light purple, and is indeed the most metallic of the three colors.

The charging case form is still the flattened oval OPPO has gotten used to, and from the side it still has a wedge-like structure similar to the Clip2. The sides and chamfered parts use a process similar to anodized sandblasting — of course it's actually plastic — and the large front and back areas use a skin-like coating; it's not yet possible to determine whether it will age and become sticky, but compared to the X3's faux-leather treatment it does feel smoother. The USB-C port is at the bottom, the pairing button is on the right side, and the build details are quite good, with even the port given a metal-bordered chamfer. In testing, the case can easily be opened with one hand, the feel is fairly smooth, and there isn't too strong an elastic feedback. The earbuds themselves sit in the case with moderate and stable magnetic force.

The earbuds themselves are still the common stem-style pods form, with a metallic sandblasted texture throughout; at the tail of the housing there is a ring of highlighted area reserved for the words "Co-created with Dynaudio", which serves as an embellishment to this appearance, and the build details remain very good. The housing is a fairly full oval, slightly wider vertically than the edges of the AirPods Pro 2, with not much difference in actual fit; basically, past users who can wear the AirPods Pro 2 well or are already used to OPPO Enco series in-ears will have no problem with the Enco X4's fit.

The Enco X4 supports IP55 dust and water resistance, enough to handle light rain or sweating during exercise.

Control & APP

The Enco X4's controls are implemented via the pressure-sensitive area on the side of the stem; unlike the mainstream approach of a recessed flat surface, OPPO chose to make a raised texture, and the blind-operation feel is not bad. It supports recognition of single, double, and triple pinches, long-press pinch, and up/down swipes; by default, single pinch is play control, double pinch is next track, triple pinch is previous track, long press switches noise-cancelling mode, and up/down swipe adjusts volume. Since the action is a pinch rather than a touch, a bit of force is needed, which also reduces accidental touches. The recognition speed and accuracy are both good, basically at the top level among TWS, on par with the AirPods and Galaxy Buds series.

The response speed and accuracy of wear detection are also good enough; it pauses when removed and resumes when worn, with almost no noticeable lag. The tactile feedback of the press action is still a bit worse than the AirPods series, but it is also among the best on the market. The default loudness of the voice prompts is sufficient, and you can also adjust it separately.

OPPO and OnePlus series earphones still rely on the HeyMelody app to link with other devices, and its UI design language is the same system as the current ColorOS. In the HeyMelody app, besides basic functions such as control customization, device switching, and firmware upgrades, it also provides a game mode switch and drop detection. From Clip2 The sound space discovered at the beginning of the period is also retained, and it even provides a function to pause sleep music...

On the software side, the Enco X4 can perform voice translation between more than 20 languages, with a monthly limit of 5000 minutes, and it can also be implemented on third-party phones through the Huanlü app. The fact that it is not limited to OPPO/OnePlus phones is very good. We have also captured some additional notes about this feature here.

In actual use, in Chinese-English, Japanese-English, and Chinese-Japanese translation scenarios, the reading and translation speed of the voice material picked up by the earbuds is relatively fast. Basically, as soon as a sentence is finished, it will produce a speech recognition result, and then the translation result will be sent back, which is basically sufficiently practical. However, the pickup on the phone side (when the other person is speaking) occasionally has difficulty fully recording long sentences and automatically interrupts, so optimization for different phones may still need to be strengthened. But in the scenario where you let the other person speak toward the phone and look at the translation result, while you use the earbuds to pick up sound and listen to the returned translation result, the Enco X4 is usable for everyday conversation.

Let me briefly mention a few smart control features.

Quick voice commands are a feature operated through recognition of fixed voice commands. Basically, after accurately saying the command, it responds immediately, though it may be a little less sensitive in overly noisy environments; in a quiet room it still responds very quickly. We tried Mandarin and the Taiyuan dialect. Mandarin recognition accuracy is very good, while Taiyuan dialect (which, compared with standard Mandarin, does not actually differ especially much in pronunciation) is more difficult. Current recognition also requires accurately saying the words; apart from cases like “previous track” and “previous song,” there is not much fuzziness.

Head movement sensitivity is not bad, but the movement range needs to be somewhat larger. The gyroscope-based cervical spine health feature has also been added, and it can also provide relatively detailed statistics on head-down posture. The sensitivity of conversation awareness is in a fairly appropriate state in quiet environments, but it still cannot avoid the possibility of being triggered even by quiet whispering, which is very normal. About five seconds after it detects that speaking has stopped, it restores the original playback state. This process uses fade-in and fade-out, with media content played at reduced volume, which is relatively natural and will not give you a “sudden braking” feeling.

ANC, Transparency & Call

Thanks to the foaming at the front end of the silicone tip, the passive isolation of the Enco X4 is actually slightly better than that of similarly shaped cavities such as the Free4 and X3. However, because the insertion depth and foaming ratio are not that high, and the cavity shape has not fundamentally improved, compared with the AirPods Pro 3, WF-1000XM5 / XM6, and Bose QC Ultra Earbuds 2, its passive isolation in the mid-high frequencies is still slightly worse.

Let's talk about active noise cancellation. It still continues OPPO's complex noise cancellation level settings. Among them, the deep noise cancellation level is a state that can be calculated in real time, and we can perceive this when switching between wind noise and different scenarios. However, it does not suddenly reduce the noise cancellation depth to medium and light; instead, it makes a gradual adjustment of about seven to eight seconds in ear pressure and low frequencies, and this design is relatively comfortable. In addition, it has a separate option that intelligently switches and adjusts among three intensity levels.

Under deep noise cancellation, its noise cancellation depth has a relatively obvious weakening ability for many stable low-frequency noises. Coverage of the lower-middle part of the vocal frequency band is also relatively adequate, and effective bandwidth coverage is also good, reaching current flagship standards. Overall, depth and bandwidth performance are on the same level as the vivo TWS 5 Pro, Freebuds Pro 5, and Galaxy Buds4 Pro, while the attenuation strength in the vocal frequency band is slightly lower than that of the Galaxy Buds4 Pro and WF-1000XM6. In scenarios such as subways, trains, and airplanes, its suppression of fixed mechanical noise still has a slight gap compared with the previously mentioned models.

The definition of adaptive is somewhat like the adjustable approach after the current iOS 27 update. You can choose whether you want a greater proportion of noise cancellation or a greater proportion of transparency, or choose the middle standard level. Generally speaking, the standard level leans a bit more toward more noise cancellation in noisy environments than Apple's adaptive middle level.

However, one thing must be complained about: at least as far as the current firmware version (116.116.199) is concerned, when the X4 enables noise cancellation (including adaptive and transparency), there is perceptible background noise... For a user like me who is insensitive to background noise, it is really not easy to have background noise that I notice on first listen. The Enco X4 achieved it. But then again, does this also affect long-term wearing and listening? Not really to that extent. This issue still depends on your own tolerance, and perhaps it is an individual bug with my unit. Ear pressure control is okay, and it is relatively appropriate even under deep noise cancellation.

In terms of wind noise resistance, it does not have a separate wind noise resistance mode. After deep noise cancellation is enabled, it can perform relatively intelligent wind noise adaptation. Before adaptation, wind sources from three directions will all produce wind noise effects, but after an adaptation process of about seven to eight seconds, wind noise will be controlled to a state where it does not noticeably affect listening.

Transparency mode, on the other hand, has only one level and is not that complex, and it also has a certain adaptive capability. Compared with the AirPods Pro series, its restoration of ambient sound still has a certain degree of attenuation in the high frequencies, but overall it is already relatively natural. Naturalness performance is good, and the main voice does not feel stuffy, so it is fairly usable in conversation scenarios. Wind noise suppression in transparency mode is also adaptive, but the filtered result does not seem as clean as with deep noise cancellation. After detecting wind noise, it reduces the strength of transparency mode, which will require time for users sensitive to ear pressure to adapt to.

OPPO specifically mentioned the X4's independent recording feature, although it is for the Find X5 series, Find N2 series, Reno 9 series, K10 series, OnePlus 10 series only supports it, but it shows that at least OPPO should be quite confident about the Enco X4's microphone. It has a VPU bone conduction microphone and a 6nm NPU for AI noise reduction processing. We actually conducted calls in a carrier environment; its call reception loudness is moderate, clarity is quite good, the tone is only slightly muffled, suppression of ambient noise is still fairly obvious, and the intervention traces are also relatively easy to perceive. The Enco X4 claims to resist call wind noise up to level seven wind; in actual attempts, wind sources from three directions indeed had no obvious impact on the X4's main reception clarity and continuity, so it does quite well in this respect.

Overall, the Enco X4's noise reduction capability ranks in the first tier among noise-cancelling TWS, there is no problem with that, and its computing power lets it handle sudden loud pressure noise somewhat faster than the X3. It has no problem meeting noise reduction needs for commuting and most scenarios, but it is basically at a similar level to this generation of products from vivo, Huawei, and Samsung; whether in noise reduction depth, bandwidth coverage capability, or transparency-related and adaptive-related aspects, it has no obvious shortcomings. Compared with the WF-1000XM6 and AirPods Pro 3 in overall noise reduction capability, it still has some gap, but it can still be included in the In-Ear Skyline Level of the TDS noise reduction capability pyramid, and ranks upper-middle among new products in this tier.

By the way, the impact of noise reduction mode on sound is still audible, so this still needs attention.

Signal & Battery | Connection & Battery

As a TWS earphone supporting the LHDC 5.0 1Mbps specification, we conducted signal testing according to the standard LHDC One independent transmitter used for LHDC, and it can only invoke the old version at a 48kHz sampling rate.

The Enco X4's basic signal performance is acceptable in the 48kHz scenario connected to LHDC One and in AAC, and packet loss begins to appear through a wall at a distance of about 9m, but within the unobstructed range of 9~11m packet loss remains controllable, and stuttering begins to appear beyond 11m. With AAC connected to the iPhone 17 and Xperia 1 V, it can also remain relatively stable within a distance of about 10m.

For devices within the OPPO ecosystem, it can be inferred that enabling LHDC in daily use is not a big problem.

The Enco X4 supports Windows Swift Pair and also supports dual-device connection. In the interface of the HeyMelody app, the priority of the multi-device switching function has been raised to the first tier, which is also a feature OPPO emphasizes. However, judging from the switching experience between LHDC and AAC devices, it is not yet completely smooth.

In terms of latency, it has a dedicated 39ms nominal low-latency game mode. We first connected to the Xperia 1 V with the AAC codec in the default state; during streaming video and local video viewing, the latency was roughly controlled at about half a character at normal speech rate, and after enabling low latency it came to about less than half a character. We also tested connection with the standard transmitter LHDC One at LHDC 48kHz; with game mode enabled the latency was still around half a character, and without it enabled it was a bit more obvious. Perhaps OPPO's own devices would be better? After all, in the LHDC 48kHz period there was still not much latency optimization.

In terms of battery life, OPPO officially provides very detailed test data, as shown in the table:

After testing through the standard process personally, with AAC connected to the Xperia 1 V, noise reduction off and sound mode-related settings at default, and continuous playback of streaming music (Apple Music Lossless) and podcast programs (Xiaoyuzhou) at 50% volume, the earphone-only battery life was 14 hours 39 minutes, counted from the indicated fully charged state, which is even a bit longer than the nominal value.

We also tested charging; it can charge relatively stably at 1.2~2.3W in the early stage, and in the later stage there is a long period at around 0.9W. It supports Qi standard wireless charging, but placing this charging coil on the front is really strange, so much so that I even suspect it was done to expose the Dynaudio logo on the back...

Speaker, Sound Modes & Codec | Driver, Sound Modes & Codec

Like the X3, the Enco X4 is also equipped with dual dynamic driver units. This time they are a coaxial 11mm "ultra-transient cast film" dynamic driver and a 6mm micro dynamic driver, also with dual DAC crossover drive.

The supported codecs are SBC / AAC / LHDC 5.0 / LC3, but OPPO's LHDC backward and cross-model compatibility has long been a difficult problem. In addition, it supports the LHDC Lossless 48kHz / 24bit tier for the first time, enabling a maximum bitrate of 2.3Mbps; in short, it is another thing limited to specific models.

The Enco X4 also supports spatial audio, and in practice it is not strictly the Dolby Atmos standard either. We still ran through the process, and it can present decent rear information, with only a slight sense of compression; the spatial presentation in three directions is also fairly regular, with relatively clear boundaries. There is still quite a lot of low-frequency reverberation, and overall thickness also increases. The sensitivity and accuracy of head tracking are both decent.

The so-called "Golden Sound" is based on ear canal scanning and something like a hearing test combined to generate an adjustment option based on six frequency bands. We tried it roughly and it was said that the mid-frequency boost range is relatively high, but to be honest, the difference before and after adjustment is not very large in terms of perceived sound. All five preset sound modes carry the Dynaudio participation mark; in addition, there is a " BassWave dynamic bass, but we don't recommend adding any more low frequencies... There is also a custom EQ that allows ±6dB adjustment at ten fixed frequency points. There is no Q adjustment or frequency setting, but tuning profiles can be shared.

Subjective Sound Description | Sound Description

Based on LHDC codec at 48kHz connected to LHDC One, sound mode "Dynaudio Original," with spatial audio, Golden Sound, and low latency disabled.

Enco X4's low frequency quantity is moderate with a slight emphasis, thickness is fairly high, and fullness is not excessive; elasticity is okay, and sub-bass extension performs well; attack and decay speed is medium, retaining mild reverberation; the coloration and richness of atmosphere are both present to some degree.

At LHDC 48kHz, Enco X4's low frequency emphasizes energy, with a somewhat larger—but far from as bloated as AZ100 and Ear (3a)—low-frequency body. Compared to TWS 5 Pro and FreeBuds Pro 5, its low frequency sounds a bit more boomy, and cohesion is not particularly high. Instruments with fundamentals in the lower-mid range have a slight forward tilt.

Midrange vocals are fairly close, mouth size is generally moderate, and refinement is not additionally emphasized; vocal texture is prioritized over line definition, vocals have some thickness while line prominence is less; the bias between male and female voices is not obvious, suiting timbres that are not overly thin or bright, with a slight boost for vocals positioned higher and more forward; grain is mildly retained, and smoothness is acceptable; timbre has a slight warm tilt, and coloration under LHDC is still not much; throat position is not high, breathiness proportion is slightly greater; forwardness of mouth sounds etc. is somewhat controlled but still perceptible; sibilance proportion is not much, and it is not completely smoothed out.

The transparency of the vocal frequency band is average, though there is no obvious artificial brightening.

For instruments, most also prioritize texture over line definition. Among strings, violin, viola, guitar, etc. all have some thickness, with bowing/plucking detail prominence slightly weaker; cello body is fairly large, taking up a considerable proportion in the space; brass has decent sense of grandeur, and brightness-needing instruments like trumpet have moderate brightness; woodwinds have okay naturalness, but always feel a bit too thick, making them seem to lack air. Instrument overtone naturalness is average.

Among percussion, Kick has slightly high presence, and Snare decay is not fast. Cymbals have moderate brightness, with metallic feel and harshness not strong.

High-frequency brightness is generally moderate, with two not-excessive peaks, and overall energy does not particularly accumulate. Extreme high-frequency extension has improved over both X3 and Free4, but compared to AZ80, WF-1000XM6, etc., the amount of extreme high-frequency information is still not rich. Roll-off is not early or fast.

Spatial scale is not large, but information within the space is fairly full, horizontal and vertical distances are similar, and boundary perception is fairly clear. Combined with the average "sense of height," Enco X4 can present a slightly oblate-spheroid, fairly near-field space. Separation between vocals and instruments is acceptable, and overall cohesion is good. Resolution capability is decent among thousand-yuan phone-brand TWS, with a slight "sense of resolution"; dynamics are okay, and transients are acceptable.

Under the same conditions, AAC codec connected to Xperia 1 V.

Low-frequency atmosphere richness decreases somewhat, while coloration increases, sounding more reverberant. Cymbal presence becomes higher, and the vocal upper range gains some unnatural coloration. Under AAC, X4 sounds lacking the fullness of LHDC, suddenly seeming much "hollower," as if something is diffused throughout the space, making naturalness and energy become indescribably strange. If switched to the "Dynaudio High Resolution" setting, this problem becomes even more serious.

In recent years, among phone-brand TWS, there have rarely been models with such an obvious tuning difference between AAC and high-bitrate codecs, but X4 has now "found that old feeling again"...

Overall Impression | Overall Impression

Ultimately, the evaluation of Enco X4 will vary greatly depending on the transmitting end (phone). If you are a user within the OPlus ecosystem, Enco X4 is a quite usable product; but if you have a device with limited LHDC support, especially users of Apple, Huawei (recent models), Samsung, Sony, etc. that have no LHDC at all, then from a sound perspective it is already not recommended.

So Enco X4's positioning is currently somewhat like Samsung and Huawei products: better when paired with their own phones and tablets, with somewhat poorer universality.

So placing it within the OPlus ecosystem, Enco X4 is clearly worth buying. In the thousand-yuan tier it has first-tier comprehensive noise cancellation capability with no obvious weaknesses, has good quality among phone-brand products and a relatively full, pop-oriented but not overly V-shaped tuning, and operation and detail experience have no obvious issues. But looking at the entire thousand-yuan market, under its current firmware version it pays too little attention to AAC. Compared with TWS 5 Pro and Freebuds Pro 5, it can only be said to trade blows at the same level, while still being at a disadvantage in AAC tuning completeness. We therefore give it an IV rating; whether it is specifically worth buying still depends on the above circumstances.

Firmware version: 116.116.100

For the KT MARK scoring mechanism and the conflict-of-interest "non-interference evaluation principle," please search for "TDS Studio Scoring Standards and Content Description V202502," which can be searched directly on mainstream search engines.

Some screenshots are from OPPO; all other content is entirely independently created. Please do not plagiarize content, copy the writing structure, etc. All rights reserved.

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