Compare: LG 55 B4 vs XIAOMI A PRO 2025

LG OLED B4 is an exceptionally versatile device in the semi-premium category. For how else could one describe an OLED television that is so well-priced, and whose price, as history shows, will quickly fall? Ideal blacks and contrast are two things that inevitably mesmerise, and we are certain that anyone who has owned a device with this panel will not be able to return to LCD units. The brightness results of the television in HDR content may seem rather low; however, in this case, thanks to this particular panel, they will appear optically much higher. It is worth noting their stability and uniformity in practically every scene. In this case, a minor downside is the brightness of a full-frame shot filled with a large amount of white. However, we do not believe this to be a serious problem, as there are not many such instances anyway. The factory colour reproduction also deserves praise, which in our specimen is very decent, but one cannot help but remember how beneficial calibration has been for the image, allowing the director's intentions to be conveyed fully. LG B4 will be an excellent choice for all kinds of gamers, as well as sports enthusiasts. The former will certainly appreciate the rich support in the form of all the conveniences stemming from the HDMI 2.1 standard. Meanwhile, the latter will benefit from the advanced motion smoothing with multi-step adjustments. And lastly, one cannot overlook the convenience provided by the remote control with a built-in gyroscope, allowing it to function like a mouse. The WebOS system, which we will navigate, is extremely smooth and responsive. It offers a multitude of applications, which will be more than sufficient for the vast majority of users. The heart of the LG B4 television is the advanced Alpha processor, responsible for the smoothness of the image and advanced signal analysis. In summary: who is the LG OLED B4 for? It is the perfect device for those expecting the highest possible image quality within a given budget, but not only that. The LG B4 stands out significantly above its competition at this price point, which cannot offer such high-quality images.

Xiaomi A Pro 2025 is an affordable QLED model that works well as a basic television in the home. The Google TV operating system deserves attention. Thanks to it, one can easily use apps like Netflix and YouTube. The interface is clear and user-friendly, and the ability to search by voice in Polish allows for quick access to content of interest. The picture on the A Pro 2025 is sufficient for everyday television watching or film viewing. Smooth tonal transitions and the enhancement of older materials make even lower resolution content look good. However, the screen brightness may disappoint in very sunny rooms – here the television performs mediocrely, but it fares much better in a dimly lit room. The television is rather suitable for occasional gaming. Low input lag ensures quick response, which is important for dynamic games. However, the 60 Hz panel and lack of more advanced features may not appeal to gamers seeking perfect image fluidity. On the other hand, A Pro 2025 may be sufficient for those who play from time to time. Not everything works perfectly. When connecting the television to a computer, the fonts are difficult to read, which can hinder text work. The Google TV system itself can be a bit slow, which sometimes complicates the quick switching of applications. Xiaomi A Pro 2025 is a simple and functional television that is suitable for daily television viewing and using apps. It has its flaws, such as average brightness and font readability issues, but at this price, it offers quite a lot. It is a good choice for those looking for budget equipment for basic uses.

LG B4 uses OLED panels produced by LG Displays. The use of this type of panel provides us with perfect contrast and black levels. With such conditions, the picture is incredibly vivid and one might even get the impression that it is three-dimensional. The series of the manufacturer with the letter "B" has always been an ideal solution for those seeking very good picture quality while not wanting to pay extra for features that are only available in higher series. Therefore, these models have become something of a dark horse in this price range, as their advantageous pricing primarily competes with Mini LED televisions. It is not difficult to say that these models have won these battles due to the absence of characteristic flaws associated with LCD receivers with multi-zone backlighting, such as blooming/halo effects or dimming of images containing fine bright details. And as we can see in the test scenes from the films "Oblivion" and "Sicario 2," the fidelity is at the highest level. Looking at the first one, we see a spectacular play of lights that, despite their brightness, are perfectly separated from one another. Even a more challenging scene with a helicopter poses no problem for LG B4, showcasing a wealth of details and a unique colour grading specific to this title.

Xiaomi A Pro is equipped with a VA matrix, which inherently offers significantly better black depth and colour intensity compared to IPS panels, especially in dimly lit conditions. Based on the conducted tests, the contrast measurement tool indicated a maximum value of around 6000:1. This is a solid result, ensuring good separation of image elements in darker scenes. An example can be the film Oblivion, where the television performed excellently in separating light and dark areas, enhancing the visual effects. Unfortunately, the television does not support local dimming technology, which is an obvious fact in this price range. This becomes particularly evident in more challenging scenes, such as those from the film Sicario 2. In such moments, the black loses intensity and starts to resemble a rather navy shade. The lack of dynamic dimming of image segments causes details that should be deeply darkened to remain slightly illuminated.

The brightness results in HDR materials for LG B4 are very good. It is true that none of them exceed 1000 nits, although the stability of luminance is excellent and looks practically the same in every scenario. The only moment where the tested television performs worse is the last of the scenes, although this should not be surprising. Large frames filled with a lot of white have always been, and probably will continue to be, somewhat of a weakness for OLED televisions. However, the combination of perfect contrast, black levels, and brightness of LG B4 allows for a full experience of the HDR effect. Additionally, the incredibly high coverage of the DCI-P3 colour gamut deserves recognition, reaching 99%. This makes the colours look incredibly vivid and striking.

In the HDR category, the television Xiaomi A Pro is, to put it plainly, lacking. Under ideal conditions, it offers brightness at around 250 nits. This is a poor result; however, in this price range, many competing models offer similar or lower values. Such brightness is too low to fully realise the potential of HDR content. In practice, this means that the image does not gain the appropriate depth and intensity expected from high-quality HDR. These values are more characteristic of standard dynamic range (SDR), which means that the true HDR effect remains beyond the reach of this model, and scenes that should stand out with spectacular brightness and contrast seem flat and lacklustre. However, for its price, the television offers good coverage of the DCI-P3 colour gamut at 92%, thanks to the use of quantum dot technology (specifically PFS LED). This results in vibrant and saturated colours, which will appeal particularly to gamers and film enthusiasts who appreciate richer shades and better colour reproduction compared to traditional televisions without this technology.

The best factory mode prepared by the manufacturer is "Filmmaker," which is exactly what we used throughout the entire testing procedure. We must admit that the unit we received out of the box had quite good colour reproduction. The biggest problem in both SDR and HDR content turned out to be white balance. In the former, a strong red hue was evident, causing the displayed image to have a pronounced yellow tint, particularly noticeable on skin tones and whites. In higher quality materials, this colour was also accentuated, but due to a lack of blue, there were also signs of green visible. Apart from these issues, we also encountered problems with grayscale and the colours themselves.

The Xiaomi A Pro 2025 television has been tested in movie mode, which offers the best colour reproduction straight out of the box. However, it is worth noting that it is not free from flaws. Analysing the white balance, it can be observed that the values for green are in the negative. This phenomenon leads to some distortions in the shades of white, and with pure white, the graph shows clear deviations. The over-contrasted image results in inappropriate tonal transitions in red, negatively affecting the quality of colour display. Generally, in the image below, it can be seen that the overall scenery before calibration acquires pink hues. Additionally, when analysing gamma contrast, the graph is significantly below the 2.4 value, suggesting that the television overly emphasises dark tones, and the brighter areas of the image may be less vivid. Furthermore, the EOTF curve shows a strong peak at the beginning, which can lead to a loss of detail in bright scenes and an unpleasant feeling of over-drawing. These aspects indicate a need for further calibration to achieve a more balanced colour reproduction and improve the overall image quality. Users who expect precise colour reproduction may be forced to take measures to adjust the television settings to achieve more realistic and natural visual results. In the xiaomi tv a pro 2025, the factory colour settings in Xiaomi are average and may require calibration. After proper colour adjustment, the image gains a natural and vibrant colour palette, much closer to cinematic standards. It is worth adding that the issue of inaccurate colour reproduction is typical for many televisions in this class, meaning it is not a flaw unique to the Xiaomi A Pro 2025 TV. For those who value perfect colour reproduction, professional calibration will prove to be a key element that enhances the overall image quality.

LG B4 has been providing very advanced calibration tools in its televisions for years. We can even say that as the only manufacturer on the market, it allows for such deep intervention in image adjustment. It is thanks to these tools that we were able to calibrate the device so well. Evidence of this is the extremely low deltaE errors, which can be said to be at a reference level. Both SDR and HDR materials now look exactly as intended by the film director. It is no coincidence that televisions of this brand are most often used as preview screens for various graphic or post-production studios.

Now it's time to check how the Xiaomi A Pro 2025 television has performed after calibration. The biggest beneficiary of this process is the white balance. After the calibration was conducted, all previous errors were corrected in both HD and 4K content, and most errors no longer fall significantly outside the value of "2". This means a much more balanced and natural colour representation, which certainly affects the viewing comfort. In terms of gamma, the drop was significantly reduced, resulting in a more consistent tonal representation across various scenes. Nevertheless, the EOTF curve has not been significantly improved due to a lack of effective control over dynamic tone mapping. This limitation means that there are still some issues with detail reproduction in bright scenes, which may affect the perception of certain materials. However, despite these minor shortcomings, the overall shape of the image is definitely better after calibration. The television has gained in quality, and the improved white balance along with reduced gamma issues allows users to enjoy a more realistic and pleasant visual experience. Further adjustment of settings may enhance image quality even more, but even now the television demonstrates its capabilities, meeting the expectations of many users.

The fluidity of tonal transitions, often overlooked in various tests on competing portals, is an equally important aspect of image quality assessment. It is particularly important when watching material that features a wealth of colours and many intricate effects, where textures blend. This often leads to the so-called banding of colours, which is a lack of smooth gradation. The tested television handles tonal transition smoothing quite well. However, it is worth noting that it has its weaker moments, such as a bright coloured sky in the film "Kingsman" or "The Martian". Nevertheless, these are not aspects that detract from the viewing pleasure. Therefore, we positively assess the quality of tonal transitions in LG B4.

During the fluidity tests of tonal transitions on the Xiaomi A Pro 2025, the gradation proved to be close to perfect. In most of the test sequences, there were no noticeable issues. Only in the scene with red water did very cosmetic imperfections appear, which, however, have little impact on the overall image quality. Both colourful and grey gradients were reproduced with almost perfect precision, making this television model a very good choice for those who pay attention to this particular feature of a TV.

In this paragraph, we will take another look at the function for smoothing tonal transitions, but we will also check how the television handles lower quality material. As we have managed to verify, the setting responsible for smooth gradation works quite efficiently, although it has its weaker moments. Just as the function works correctly in SDR content, it becomes rather useless in HDR content. Even at the lowest of the options, it blurs essential details, which is why we advise against using it.

The image scaling on LG B4 is rated rather moderately positively. Although there is no edge doubling, the image itself is naturally "soft." We can change this by adjusting the sharpness slider.

How does the Xiaomi A Pro 2025 television cope with tonal transitions, especially with lower-quality materials? Thanks to advanced digital processing, the colour contour removal function works surprisingly well. We recommend setting this option to "Medium" – the television significantly improves the fluidity of tonal transitions while avoiding excessive smoothing of other image elements, such as film grain.

In the case of the tested image featuring a model and numerous branches in the background, the Xiaomi A Pro 2025 showcased its capabilities in terms of digital processing. Adding artificial sharpness to this scene made the details of the model more pronounced, and her hair appeared more detailed. However, delicate contours appeared around the branches in the background, which were a result of digital interference. Although this enhances the overall impression of detail, excessive sharpness can make some elements of the image seem unnaturally emphasised.

The maximum refresh rate that we can set on the LG B4 is 120 Hz. This is the absolute minimum for those requiring high image fluidity. The manufacturer has implemented a multi-step motion smoother called "TruMotion". It has been divided into two separate sliders adjusting the sharpness of moving images (De-Blur) and jitter (De-Judder). Both sliders can be set in the range from 0 to 10, with each degree affecting the level of fluidity, so everyone can find their golden mean.

The LG OLED B4 panel features an average response time of 0.1 ms (which directly results from our measurements), allowing for an incredibly clear image, unattainable for LCD televisions, whose response times can be as high as several milliseconds. This is clearly evident in the pictures from the "UFO Test", showing no trail following the object.

Xiaomi A Pro 2025 offers a motion smoothing feature called "Motion Smoothing," which primarily works in films. It can be adjusted to prefer either a more cinematic, film-like effect with visible frames, or a smoother, theatre-like image. This function should satisfy those who intend to watch mainly films on it. However, gamers and sports fans may feel disappointed. The 60 Hz refresh rate panel, typical in this price range, does not impress. Our "Ufo" test revealed some motion blur. Those expecting better sharpness of moving objects may be slightly let down.

The LG B4 television is equipped with four fully-fledged HDMI 2.1 ports with a full bandwidth of 48Gbps. All features that are identical to this standard were activated without any issues, and throughout the entire testing process, they did not cause any problems. The combination of such extensive functionality and low input lag suggests that the tested television is truly made for gaming. This is not surprising, considering that the manufacturer has always placed great emphasis on this. Therefore, we can enjoy both the properly implemented HGIG mode and gaming in Dolby Vision with low latency. This pairing will certainly attract the attention of all passionate gamers for whom quality is paramount.

An additional standard in televisions from this Korean manufacturer is the implementation of GameBar, allowing for quick adjustment of settings "on the fly," without the need to exit the game. It also enables image adjustments for individuals with visual impairments, which is a very nice touch. Another important piece of information is that when VRR technology is enabled, we will not experience a drop in contrast. This is thanks to the construction of the panel and the lack of conventional backlighting. However, it is normal for shades of grey to flicker slightly; nevertheless, this is a characteristic feature of this function regardless of the manufacturer or television.

In summary: the LG B4, like all of the manufacturer’s OLEDs equipped with 120Hz panels and HDMI 2.1 ports, creates a harmonious whole with the console. In practice, this is a comprehensive television, and if we expect the highest possible efficiency in gaming, B4 will be the ideal choice.

Xiaomi A Pro 2025 offers several features useful for gamers, including Game Bar, which is different from the typical "dashboards" with interfaces found in other manufacturers' products. Thanks to this, users can quickly access game-related settings, which is convenient during intense sessions. The TV also supports Automatic Low Latency Mode (ALLM), meaning it automatically switches to a mode optimised for gaming, reducing signal latency. Unfortunately, it lacks support for HDMI 2.1, limiting its capabilities for connecting the latest gaming consoles that may require higher bandwidth. Additionally, the TV does not support features such as VRR (Variable Refresh Rate) or G-Sync, which are increasingly desired by gamers, as they allow for smoother visuals and eliminate tearing. For these reasons, although Xiaomi A Pro 2025 has some features for gamers, in this price range, better options can be found that offer more advanced solutions dedicated to gamers.

Input lag for the LG B4 is at an incredibly low level in every scenario. Even the most dedicated gamers will certainly appreciate the very low input lag at demanding 4K 120 Hz settings with HDR, which is just 5 ms. It is also worth noting that the lag at these same settings, but with Dolby Vision HDR enabled, remains consistent, which is not as evident with the competition. Therefore, it deserves the highest rating and recommendation.

Xiaomi A Pro 2025 achieves remarkable results, regardless of the resolution or HDR mode. With measurements at just 15 ms, this television ranks among the top in terms of responsiveness.

LG B4 combined with a PC performs excellently, thanks to a very low latency of just 13.5 ms, which is practically an instant response between the mouse, the eye, and the screen. An extremely important factor when working on a screen is primarily the readability of the text, which in the case of the tested television is very good. However, it is worth noting that to achieve sharp fonts, one must enable the passthrough option in the settings.

The RWBG pixel layout has no significant impact on the display of fonts or letters, which provides a considerable advantage over Samsung's QD-OLED matrices. Users of both Windows and macOS equipped computers are sure to be pleased with the performance on the screen of the tested television.

In the category of cooperation with PC, Xiaomi A Pro 2025 performs very poorly. The fonts are of low quality, and their display on the screen is often problematic. Dithering is ubiquitous; when the fonts are enlarged on a dark background, they are displayed in three colours, which is definitely glaring and can significantly hinder comfortable use of the device. Such problems can be a significant downside for users who plan to use the television as a computer monitor.

The undisputed advantage of OLED panels is their performance in the context of group viewing, that is, from various angles. LG B4 maintains very good contrast, colour saturation, and fidelity. Although this is not the result of organic televisions supported by MLA technology, one cannot say that anyone who purchased the device was dissatisfied with the results obtained. However, it should be noted that at sharp angles, a slight greenish tint can be observed. This is a characteristic feature of LG's WRGB panels, without the aforementioned micro-lens technology, and unfortunately, there is nothing that can be done about it.

In the category of viewing angles, Xiaomi A Pro 2025 with a VA panel performs quite poorly. Although you can enjoy better blacks when viewed head-on, from side perspectives, the image loses quality. Our specialists noticed during the testing of the television that sitting a metre away from the device, the image on the right side appeared brightened and desaturated. However, moving a bit to the side improves everything, which demonstrates the significant difference in image reception depending on the viewing angle. All of this means that the experience of watching in a larger group may be less satisfying.

The maximum brightness of the television in SDR materials is 370 nits. For an OLED television, this is a very good result and allows for quite comfortable viewing during the day. It is worth paying attention to two things. The first is the rather mediocre handling of reflections caused by the satin finish of the panel, which means that direct light hitting the television will be quite obtrusive. The second issue is the brightness of the screen when filled 100% with white, oscillating around 260 nits, which is an excellent result, as until recently, OLED televisions in this price range could "boast" a brightness twice as low. Thanks to this, the conditions for watching, for example, winter sports will be very good.

Xiaomi A Pro 2025 presents itself as average. The panel coating is satin, which may help reduce reflections, but the suppression of glare is average. The brightness of the television is only 250 nits, which is a relatively low result compared to other models on the market. As a result, on sunny days or in brightly lit rooms, the picture quality may suffer, and details may be difficult to perceive.

LG B4 uses the well-known proprietary system WebOS. The system offers practically all the most important applications, and those that are lacking can be counted on one hand, such as CDA or KODI.

WebOS also boasts a highly appreciated ability to perform operations using a cursor that appears when the remote control is moved. The convenience of such a feature is invaluable when entering queries or passwords for portals. WebOS, like most systems, also supports functions such as screen mirroring, AirPlay, voice search in Polish, and the capability to connect headphones via Bluetooth. On a more practical note, WebOS allows us to use both headphones and the television speaker simultaneously, which will certainly be a great help for those with hearing impairments. Among the more interesting features, particularly appreciated by sports fans, is the option to enable an alert for upcoming matches, ensuring that we never miss a broadcast. The home panel also deserves praise for allowing control of all smart devices connected to the home network. For example, the end of a washing cycle will be signalled by a notification in the top right corner.

In summary, the WebOS system, despite being less known and having certain limitations compared to Android TV, offers stable and fast operation and supports most functions that users may need. It is a solid solution for those looking for a simple and effective operating system in a television.

In terms of functionality, Xiaomi A Pro 2025 stands out with the Google TV system, which is one of its biggest advantages. This allows users access to a wide range of apps and streaming services, greatly enhancing the convenience of using the television. The Google TV system also offers a voice assistant that simplifies navigation and allows for quick content searches without the need to browse through menus. One of the key benefits of this system is the ability to download virtually unlimited applications from the Google Play Store, enabling users to personalise the television according to their individual needs. Users can install streaming apps, games, and various tools, making the television a multimedia entertainment hub. However, it is worth noting that this model does not have recording functions or AirPlay, which may be disappointing for some users. Additionally, there are quite significant lags in the operating system, affecting user experience. On the plus side, it is also possible to pair other peripheral devices via Bluetooth, and the remote control does not require aiming at the screen, which significantly improves usability. Despite some shortcomings, Xiaomi A Pro 2025 has the potential to satisfy the needs of users looking for a modern television.

The default file player in LG B4 definitely handles most images well, although the absence of a few equally popular formats is surprising. We can successfully play videos recorded in virtually all the most popular formats, including Dolby Vision. The only codec that LG B4 will not play is H.266 VVC, although this is currently rather unused. However, it is worth noting the supported image formats, of which there are only two: JPEG and PNG. Users of Apple devices may feel disappointed by the lack of support for the HEIC format, which is the default format when taking photos. The remedy for this is to use the built-in AirPlay feature. We will also mention the lack of support for TXT subtitles.

Xiaomi A Pro 2025 offers a decent built-in media player that meets basic user expectations. However, the television has its drawbacks and sometimes encounters issues with playing certain file formats, which can be frustrating. Fortunately, with access to the Google Play Store, users can easily download alternative players that better meet their needs. In our test of the Xiaomi TV A Pro 2025, we demonstrated that its compatibility with applications is high, and additional media playback apps work flawlessly. It is also worth noting that the Xiaomi TV A Pro 2025 is equipped with the Android TV platform, allowing access to a wide range of applications and streaming services. Installing alternative media players improves the overall functionality of the device and eliminates compatibility issues with formats. As a result, the Xiaomi A Pro becomes a more versatile television that can meet the diverse expectations of users, even those with higher demands when it comes to media playback.

The audio system built into the LG OLED B4 can be considered quite good. We can say that it performs well for its price range. The bass is quite noticeable, but does not overpower the other frequencies. It can be said that the sound is fairly well balanced. We believe that those opting for this class of display are, or will be, in possession of an appropriate audio system. Therefore, the presence of DTS-HD Master Audio and Dolby Atmos codecs is not insignificant.

When it comes to sound, Xiaomi A Pro 2025 is impressively positive, especially considering its price. The sound quality is truly solid, and the audio does not deviate from what one would expect in this class. Additionally, the television supports DTS audio formats, which are often lacking in much more expensive TVs. It is worth noting that this assessment is subjective and may vary depending on individual preferences.

LG 55 B4 vs XIAOMI A PRO 2025

Advantages

Disadvantages

Our verdict

TV appearance

Where to buy

Contrast and black detail

HDR effect quality

Factory color reproduction

Color reproduction after calibration

Smoothness of tonal transitions

Image scaling and smoothness of tonal transitions

Blur and motion smoothness

Console compatibility and gaming features

Input lag

Compatibility with PC

Viewing angles

TV efficiency during daytime

Details about the matrix

TV features

Playing files from USB

Apps

Sound