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Unfortunately, I just can't actually show the difference to you…

Astell & Kern A&ultima SP4000: Two-minute review

The Astell & Kern A&ultima SP4000 is the brand’s newest flagship digital audio player, and it is priced accordingly. If you measure the worth of a product by how relatively heavy and remarkably shiny it is, though, you won’t be able to argue with the $3,999 asking price.

The SP4000 goes a distance towards justifying its cost in the way it’s specified to perform, too. Numerous technological highlights abound, none of them in any way ‘affordable’, and between the sheer heft of the physical item and the lengthy list of technologies Astell & Kern has brought to bear, the SP4000 seems about as purposeful as these things ever get.

And in action, it is an uncomplicated pleasure to listen to, fully befitting a place in the best MP3 players around. In every meaningful way, the SP4000 is an extremely accomplished device, able to combine brute muscularity with deft insight, rhythmic positivity with outright scale. No matter what you choose to listen to, the Astell & Kern seems to enjoy it just as much as you do – and it’s not about to sit in judgement on your choice of headphones either.

Astell & Kern A&ultima SP4000 review: Price and release date

(Image credit: Future / Simon Lucas)

• Priced at $3,999 / £3,799 / AU$6,599

The Astell & Kern A&ultima SP4000 is on sale now, and in the United States it sells for $3,999. In the United Kingdom the asking price is £3,799, and in Australia you’ll have to part with AU$6,599.

Not cheap, is it? Anyone who takes an interest in this sort of thing will know Astell & Kern has no problem in pitching its products as uber-high-end propositions, but no matter how many times I see one of its products priced this way, it remains difficult not to do a double-take…

Astell & Kern A&ultima SP4000 review: Features

(Image credit: Future / Simon Lucas)

• 4 x AKM4191 and 4 x AKM4499EX DACs in 1:1 architecture
• 4 x opamps per analogue output
• Snapdragon 6125 octa-core processor

Something would seem amiss, wouldn’t it, if a digital audio player costing very nearly four thousand of your US dollars wasn’t groaning under the weight of its specification? Well, when you consider the extensive nature of the SP4000, it’s a wonder it’s not even bigger and even heavier than it actually is.

It follows that I should try to be reasonably brief, otherwise we’ll be here all day.

At its most fundamental, the SP4000 is built around ‘octa’ audio architecture. The digital-to-analogue signal processing is in a 1:1 structure, with one AKM4191 digital processor paired with one AKM4499EX DAC. This allows digital signals to be delivered to a single DAC, four times over – this is a true quad-DAC design, with the aim of allowing precise signal transfer with a vanishingly low signal-to-noise ratio. The ability to deal with PCM resolutions of up to 32bit/768kHz and DSD512 means any realistic digital audio file is catered for.

There are eight opamps deployed, four attending to the unbalanced 3.5mm analogue output and four dealing with the 4.4mm balanced equivalent. The intention is to increase dynamic range and enhance detail retrieval – Astell & Kern calls this arrangement ‘high driving mode’ and suggests it provides powerful and stable signal output.

A newly developed LDO (‘low drop-out’) regulator in the power supply stabilizes battery voltage in an effort to suppress noise. Proprietary ESA (‘enhanced signal alignment’) technology is designed to improve the alignment of frequency signals (sometimes opaquely referred to as ‘timing’) to minimize distortion and enhance clarity. The PCB is a high-end ‘Any Layer HDI’ design that allows for extremely complex circuitry to be laid out in a very small space, minimizing signal loss.

(Image credit: Future / Simon Lucas)

What else? The audio block sits behind a 99.9% pure copper shielding can, offering significant shielding from electromagnetic interference. The audio block itself is Astell & Kern’s ‘Teraton X’ design, which incorporates HEXA-Audio circuitry along with power-efficient amplification and considerable power noise cancellation, to deliver what the company suggests is the ‘ultimate sound solution’.

The entire show is run by a Snapdragon 6125 Octa-core processor that features a high-performance CPU and 8GB of DDR4. CPU, memory and wireless comms circuitry are configured as a single module, and with the digital circuit components arranged in the same area it’s effectively a system on a chip.

I could go on. There are six digital filters available to allow the user to, in a small way, design their own sound. The ‘crossfeed’ feature allows a little of the left-channel mix into the right channel (and vice versa) and, in conjunction with some adjustment options, tries to replicate the effect of listening to speakers when listening to headphones. The second generation of Astell & Kern’s DAR (‘digital audio remaster’) technology, dubbed ‘Advanced DAR’, uses a ‘virtual sound extender’ as part of a two-stage upsampling process that can convert PCM signals of up to 48kHz to 385kHz or to DSD128, and signals of greater than 96kHz to DSD256, for playback.

Surely, though, the broad point is made by now. Astell & Kern didn’t leave space for the kitchen sink, but it has thrown pretty much everything else at the A&ultima SP4000.

Features score: 5 / 5

Astell & Kern A&ultima SP4000 review: Sound quality

(Image credit: Future / Simon Lucas)

• Epic levels of insight and detail
• Rhythmic and dynamic positivity
• Sounds simultaneously open and unified

Yes, you can fiddle around the edges of the way the A&ultima SP4000 sounds – investigate filters, fool around with EQs, you name it – but what you can’t do is alter its overarching sonic character. Which is just as well, because this Astell & Kern digital audio player is a staggeringly direct, informative and, ultimately, complete listen. Few are the sources of audio information, of any type and at any price, that can match its powers of communication – and I have heard plenty.

No matter if you’re listening to a 16bit/44.1kHz FLAC file of Ride’s Leave Them All Behind, a 24bit/48kHz FLAC file of James Holden’s Common Land or a DSD64 file of The Band’s I Shall Be Released: it’s all the same to the SP4000. In every circumstance it’s a profoundly detailed, rhythmically positive, articulate and energetic listen. There really isn’t an aspect of music-making at which it doesn’t prove itself masterful.

And it’s not as if I can offer a “yes, but…” or two in the name of balance. The longer I listen to the SP4000, the more beguiled I become.

Tonal balance? It’s basically impeccable. Frequency response? Smooth and even from way down at the low frequencies to the vertiginous top end. The Astell & Kern sounds naturalistic and unforced, and it’s completely even-handed in the way it presents the frequency range. And at every point, it’s absolutely alive with detail both broad and fine. The minutiae of tone, timbre and texture are made absolutely apparent, and the player loads all of this information onto the listener without being in any way showy or uptight about it. This fanatical attention to detail is simply a way of ensuring you get as complete a rendition of your digital audio files as possible.

The presentation is spacious and well-defined at the same time, and no matter if it’s a large ensemble all packing the stage or just one voice with a single guitar as accompaniment, the SP4000 lays it all out in confident and coherent fashion.

It deals with rhythm and tempo with similar authority, keeping momentum levels high and observing the attack and decay of bass sounds (in particular) with obvious care. It can ease back if necessary, though - nothing gets hurried along, but rather is allowed to proceed at its own chosen speed. Dynamic headroom is, to all intents and purposes, limitless. From the smallest, quietest event in a recording to the last almighty crescendo, the SP4000 is on top of things - the distance between these two states is prodigious. And the smaller, but no less crucial, dynamics of harmonic variation, the attention to the over- and undertones that surround the fundamental when listening to a solo instrument, are given very judicious weighting. Context is everything, and the SP4000 seems to almost instinctively understand it.

And the Astell & Kern even has the decency not to be sniffy either about the music you listen to or the headphones via which you access it. Obviously it does better work (or, rather, its potential is best exploited) by hi-res files and high-end headphones - but if you want to connect your bog-standard true wireless in-ear via Bluetooth and listen to Spotify’s free tier the SP4000 won’t judge you. Not too badly, anyway.

Sound quality score: 5 / 5

Astell & Kern A&ultima SP4000 review: Design

(Image credit: Future / Simon Lucas)

• Polished 904L stainless steel and PVD-coated ceramic
• 150 x 85 x 20mm
• 615g

Ordinarily, a digital audio player is designed to be reasonably compact, and light enough to be slipped into a pocket. Of course, Astell & Kern sets out for its digital audio players to be anything but ordinary.

So the SP4000 is a fairly large (150 x 85 x 20mm) device that weighs a considerable 615g. Too big and heavy, in other words, to be comfortably carried in any pocket smaller and less robust than that of a military greatcoat. This is its naked weight, too. If you add one of the included screen protectors (which is, admittedly, going to make negligible difference to the weight) and slip the player into its supplied Perlinger leather* protective case, it becomes heavier still. At least that case prevents the player’s sharp, pointy corners from digging into hands or pocket linings, mind you.

(*I’m not a vegetarian. I know people who are, though, and some of them are just as interested in high-quality audio as I am. So once again I find myself wondering why companies like Astell & Kern imagine real leather – in this instance, leather made from "the soft, delicate hide of calves under one year old" – to be the untouchable height of luxury. Surely it’s possible to offer a protective case for the SP4000 that looks and feels upmarket but that isn’t going to alienate who knows how many prospective customers? Or is that just me?)

The four sides of the SP4000 are built of 904L stainless steel (the same stuff the likes of Rolex uses, on the basis that it will accept an extremely high polish), and feature some of the angularity and asymmetry that Astell & Kern established as part of its design vocabulary a good while ago. The front is of toughened glass, 152mm on the diagonal, and is almost entirely touchscreen. The rear panel, meanwhile, is finished in PVD-coated ceramic.

It really goes without saying that the standard of build and finish on display here is flawless. With the design of the SP4000, Astell & Kern has set out to deliver a product that blurs the line between ‘electrical hardware’ and ‘luxury accessory’. Or, as the company’s website rather feverishly has it, "a work of art where technology, design, intuition and performance converge". You may feel that Astell & Kern has done exactly what it set out to do, you may find the design rather self-consciously opulent. Taste is a very personal thing, after all.

It’s worth noting the grandeur of SP4000 ownership starts well before you peel the protective covering off the player itself. It arrives in a branded box that’s a similar size to that which contained a pair of size 10 Tricker’s boots I bought the other day. Inside there is another, branded, clasp-fastening box covered in what I strongly suspect is a further quantity of leather.

Inside that you’ll find the SP4000, along with compartments that contain that Perlinger leather cover, a case with a flap covering into which the player (in its cover) can be slipped (more leather, I presume), various guides and warranty documents, a congratulatory note from the company, and a reasonably heavyweight, branded USB-C to USB-C cable. I am pretty sure this all comes under the heading of ‘the experience’.

Design score: 4 / 5

Astell & Kern A&ultima SP4000 review: Usability and setup

(Image credit: Future / Simon Lucas)

• 2160 x 1080 touchscreen
• Supports Full Android OS
• Qualcomm QC3.0 fast charging

The SP4000 represents the first time an Astell & Kern product has supported full Android OS. The convenience and all-around common sense of the operating system is intended to help the SP4000 be as flexible and convenient as possible, while some of the Snapdragon 6125 octa-core processor’s responsibilities center around rapidity of the OS response and the smooth, comfortable user interface motion.

Happily, it all works very well. The big 2K (2160 x 1080) touchscreen is responsive and swift, smooth-scrolling and consistent. The operating system will be mercifully familiar to anyone whose smartphone isn’t an iOS device, and it’s just as wide-ranging and usable here as it is in its most successful smartphone applications.

Setting up the SP4000 is no kind of hardship. It’s simply a question of connecting it to your local network (its dual-band Wi-Fi is tenacious when it comes to making and maintaining a connection to your router or tethering to your smartphone if you’re out and about), and from there it’s simple to load the apps you require. The ‘AK File Drop’ function makes transferring files from a PC, smartphone or FTP program on a common network faster and easier than before, too.

The Astell & Kern also supports Qualcomm QC 3.0 fast charging, which means it can be charged more rapidly (and more efficiently) than previous flagship A&ultima models. Mind you, ‘fast’ and ‘rapid’ are definitely relative terms in this instance. From ‘flat’ to ‘full’ takes around five hours, which is about half the time it takes for the SP4000 to flatten its battery if you’re listening to ordinary files at ordinary volume levels.

There are a few physical controls arranged around the edges of the SP4000. As you look at its touchscreen, there’s an elaborate volume control/power on/off on the top-right edge – it’s pleasantly shaped and knurled, and a light behind it glows in one of a variety of different colors to indicate the resolution of the audio file it’s currently playing.

On the opposite side there are three buttons that deal with skip backwards/rewind (accessible via ‘press’ or ‘press and hold’ respectively), skip forwards/fast-forward (same) and play/pause. There’s a ‘button lock’ switch on the top edge, to the right of the 3.5mm hybrid optical/unbalanced analogue and 4.4mm balanced analogue outputs, and on the bottom edge you’ll find a USB-C socket and a microSD card slot, which will accept cards of up to 1.5TB.

Usability and setup score: 4.5 / 5

Astell & Kern A&ultima SP4000 review: Value

(Image credit: Future / Simon Lucas)

First things first: you don’t contemplate ownership of the Astell & Kern A&ultima SP4000 because you’re in any way concerned about value for money. Is it the best-sounding DAP out there? Sure. Is it twice as good as alternatives from the likes of FiiO or Astell & Kern itself that cost comfortably less than $2k? Not a chance.

No, the value in the SP4000 comes from its status as the shiny flagship of the Astell & Kern range. It comes from the knowledge that no one you bump into when in the First Class Lounge has a more expensive DAP than you. It comes from the ability to add ‘DAP’ to the list of ‘madly luxurious accessories I own’.

Should I buy the Astell & Kern A&ultima SP4000?

(Image credit: Future / Simon Lucas)Buy it if... 

You want more from your digital audio player than just digital audio
In the same way as there’s more to a Montblanc fountain pen than just the ability to function as a pen…

You admire extremely thorough specification
Astell & Kern has left no stone unturned here.

You take good care of your belongings
That super-shiny stainless steel is quite fingerprint-hungry…

Don't buy it if... 

You pay the slightest attention to value for money
It’s it’s true value you’re after, virtually any other Astell & Kern DAP will suit you better than the SP4000.

You’re vegetarian or vegan
Astell & Kern considers leather to be shorthand for ‘sophisticated’.

You don’t own any expensive, high-performance headphones
You’d better be budgeting for some, that’s all I can say.

Astell & Kern A&ultima SP4000 review: Also consider

FiiO M23
The FiiO represents remarkable value at $699 for a DAP with such balanced, eloquent and entertaining sound. And think of what you could do with all the money you’ll have saved...
Read our full FiiO M23 review

Astell & Kern Kann Ultra
Don’t bother looking for like-for-like alternatives to the A&ultima SP4000 – there aren’t any. But there are some extremely capable digital audio players available for a fraction of SP4000 money, many of them well worth considering. The Astell & Kern Kann Ultra, for instance, is a great-sounding and well-specified device that’s yours for $1,759.

How I tested the Astell & Kern A&ultima SP4000

• Tested for over a week
• Tested with streamed and downloaded content
• Tested with wired and wireless headphones

I slotted a microSD card filled with hi-res content (up to 24bit/192kHz and DSD64, anyway) into the SP4000, and I downloaded the Tidal and Presto music streaming apps while I was at it.

I used Sennheiser IE900 IEMs connected via the 4.4mm balanced output, Austrian Audio The Composer over-ears via the 3.5mm unbalanced alternative, and tried out the Technics EAH-AZ100 true wireless in-ears and Bowers & Wilkins Px8 wireless over-ears too.

I listened to lots of different types of music, via lots of different file types and sizes – and I did so indoors and (with some trepidation, I don’t mind telling you) outdoors too.

• First reviewed in September 2025

• Read TechRadar's reviews guarantee

Not for the first time, Astell & Kern has delivered a digital audio player it suggests represents “the peak of performance and design”. Is the SP400 an actual peak this time, or just another step in the journey?

The Google Pixel 10 range doesn’t add much on top of its Pixel 9 predecessors, making it difficult to recommend in the face of a potential saving.

The KTC MegPad A25Q5 is an ultra-portable 25-inch touchscreen monitor with fully integrated Android 14 that enables it to be used as a large-scale tablet, monitor for your laptop, or as a completely standalone device, giving it plenty of potential.

KTC MegPad A25Q5 monitor: 30-second review

From the outset, the potential of the KTC MegPad A25Q5 is obvious, essentially offering a completely portable touchscreen monitor with the Android 14 operating system that gives you full access to the Play Store and all of the apps that come with it.

Starting out, everything looked positive with a solid build and great design, so I started by looking at some of the usual Android apps that I use when testing other Android devices. The integration proved to be good, especially if you want to watch streaming video from YouTube or your favourite streaming service.

However, while it's great seeing the Android 14 at such a scale, some apps seemed soft in clarity, as if the scale of the display was slightly beyond the limits of the screen size, as there was sometimes a lack of crispness of icons and text in some but not all apps.

The more I started to delve into video and games, the more I started to see the limitations of this monitor that's pushing physical size with the display resolution. It still looks good, but sit too close and you'll notice that the colour lacks tonal graduation and details are smoothed in much of the video content. The HD resolution just starts to make everything look a little bit soft, especially when I'm so used to high-resolution monitors 4K and above.

The ability to plug into a laptop is handy with that 25-inch screen. However, once again, because the pixel depth is reduced, the clarity of the text on screen, whilst perfectly readable, just isn't as crisp and smooth as I've come to expect with the latest laptops, phones and tablets, even at the entry level. And once again, there's the fine detail, and the colour that once again lacks. So if you are thinking of this as a portable monitor for creative or even office use, then it is going to be a little bit limiting.

I really did like the fact that it has an internal battery and gives you a relatively decent amount of usage time, but once again, if you're thinking about using this portable monitor out on site, then that battery life at 5 hours will be a limit. Whilst it's fine for the odd meeting or lengthy presentation, anything ongoing just isn't possible.

The other aspect to consider is if you think this monitor could be useful for gaming, but again, with a 1080p resolution and maximum refresh rate of only 60Hz, games lack the impact of other smaller portable monitors, and that refresh rate does make some games look a little bit jerky, and then there's the actual power of the processor and CPU to contend with.

So, whilst the design and build quality of this monitor is good and I love the concept, it lacks the quality of hardware to enable it to reach its potential.

KTC MegPad A25Q5 monitor: Price & availability

• How much does it cost? $399
• When is it out? Now
• Where can you get it? Widely available

At present, the KTC MegPad A25Q5 is available directly from the KTC US website and is priced at US$399, with the usual regular price of US$599.

In the US, I'm also seeing it on Amazon.com for $390 and on Newegg, where it's priced at $346.

• Value: 4 / 5

(Image credit: Alastair Jennings)KTC MegPad A25Q5 monitor: Design

(Image credit: Alastair Jennings)Specifications

CPU: Qualcomm SM6115 (Snapdragon 662-class)
Graphics: Adreno 610 (integrated)
RAM: 8GB LPDDR4
Storage: 128GB internal (expandable)
Left Ports: USB-C, DC in
Onboard controls: Power button, volume rocker
Connectivity: Wi-Fi 5, Bluetooth 5.2
Audio: Dual stereo speakers, 3.5mm jack
Camera: 720p front camera with privacy slider
Size: 568 × 332 × 39 mm
OS Installed: Android 14
Accessories: Remote control, charger,

The aesthetic design of the KTC MegPad A25Q5 is striking, with its matte cream finish giving it a stylish and friendly aesthetic. The body is nicely curved with a textured back and fabric carry handle with a robust fold-out stand that enables you to position the monitor in both landscape and portrait orientation.

When it comes to the size, it measures in at 22.37 in x 13.09 in (568.3 mm x 332.5 mm) with the thickness just 1.54 in (39 mm). Overall, the build quality of the monitor is exceptionally high, not quite premium, but not far off.

Taking a look around the body of the monitor, there are only two ports: the first is for the power, and the second is for the USB-C connection that enables you to plug into a laptop or tablet so that the machine can be used as an external display. Alternatively, you can plug in an external storage device. Otherwise, the only other physical feature is the small webcam with a privacy slider that enables you to slide a physical cover over the camera.

The display itself has a gloss finish that handles reflections well, with bezels that are relatively thick at roughly 10 mm, although, as they're flat to the display, these days, you would expect a slightly thinner design.

The diagonal of the display is essentially 25 inches, which does give you a good viewing area, especially for a portable monitor. And as well as being an IPS, it also offers 10-point touch functionality, which, for the Android operating system,. However, if you're connecting to a laptop with touchscreen functionality, that touchscreen functionality isn't carried across to the monitor for Windows 11 or macOS.

Alongside the monitor comes a very handy remote control that enables you to sit back and actually interact with the monitor without needing to get up and touch the screen. The layout of the remote is intuitive, with physical buttons that make it easy to navigate around the Android screen interface and also adjust volume and the monitor settings, and has a nifty pointer option, which is more intuitive to use when using streaming and TV apps.

As a portable monitor, there is quite a lot on offer here. The fact that it can be used as a touchscreen Android tablet at scale for streaming and watching back web content, and also used as an external monitor for your laptop or tablet, and will playback media from external storage devices does give it plenty of potential, especially with a design and build quality that means it's durable enough to easily be carried around, making it a seemingly ideal solution for many creative and business users.

• Design: 4 / 5

KTC MegPad A25Q5 monitor: Features

(Image credit: Alastair Jennings)

The feature list here is impressive, with the standout feature being the pure portability, thanks to the built-in internal battery that supplies it with a good few hours of use. Unlike other portable monitors, there's also an integrated Android device with full Android 14 OS, including the Play Store, readily accessible once powered up.

The monitor has also been exceptionally well conceived, so it's simple plug and play, so when you plug your laptop or another tablet device into the monitor through the USB-C connection on the side, the monitor instantly recognises that it is being required as an external display and automatically swaps its usage type from tablet to external display.

Going into some of the features and settings within the Android operating system enables you to adjust a lot of the visual settings, including the brightness and screen colour temperature. Through this test, I found that the default screen brightness of 55% was actually a really good balance for everyday use.

Internally powering the Android 14 operating system is 8GB of RAM and 128GB of storage, which is relatively good for storing apps on the system. While the internal storage isn't huge, there is the option to connect other external storage devices through the side USB-C port, and this supports the ExFat file format, which is quite generic and widely used.

As I mentioned in the build section, there is an 8 million pixel webcam, which is good enough for 720p quality, not as high as you'd find on many premium mobile phones, but decent enough for a bit of web conferencing. One of the things I liked about the webcam is that it has a privacy shutter, so you can be absolutely 100% sure that when the shutter is slid across the lens, you won't be broadcasting.

If you're looking for a portable monitor for use as part of a display, then the touchscreen functionality is obviously quite handy, especially for presentations or interactive displays where you want people to interact with the monitor itself, as long as what you're using is Android-based.

There's also a physical remote control, so if you are using it for media or kiosk use, then you can interact with it using the remote from a distance. Whilst the remote is simple, it does give you lots of control over all of the options and settings, including playing back media.

Again, when it comes to the features, it is a shame that there is no HDMI, DP input, or Bluetooth; there's just that one USB-C port. However, through the test, I did find that the Wi-Fi connection was extremely robust.

• Features: 4 / 5

KTC MegPad A25Q5 monitor: Performance

(Image credit: Alastair Jennings)

Display quality:

GAMUT: 4.5
Tone response: 3.5
White point: 2.5
Contrast: 2.0
Luminance uniformity: 3.5
Colour uniformity: 4.5
Colour accuracy: 3.5
Overall rating: 3.5

Hardware performance:

Disk Speed Test Read 822 MB/s
Disk Speed Test Write 185 MB/s
Geekbench Single 319
Geekbench Multi 948
Geekbench GPU 297
3DMark Wildlife: 504
3DMark Slingshot: 1732

The KTC MegPad A25Q5 has, from the outset, so much potential. The design is elegant, it feels really robust, and with that carry handle on top, it is ultra-portable. So, if you need to carry it around the office or you're at a show and need to use this as a kiosk display, then its portability is a real bonus.

Personally, I also really like the simplicity of the design. The front of the screen is just nice and clean, and although it does have that rather thick bezel going all the way around, it isn't overly distracting.

While the number of input/output ports is relatively meagre, just the power and USB Type-C, they do offer enough to make this an extremely flexible portable monitor in use. With the ability to use it as a large-screen Android tablet, an external monitor for your laptop, or if you plug in external storage, it can be used as a playback device, obviously using the Android 14 operating system.

I started the test by taking a look at the Android functionality. And whilst at 25 inches the screen does push the Android operating system user interface, it still looks nice and clean and is very easy to navigate. In use, with that 8GB of RAM and decent volume of storage, the operating system does seem to run exceptionally smoothly. Loading up web streaming services from Netflix to YouTube, the streaming quality of video does seem exceptionally good. And whilst the screen is limited to 60Hz, for most TV and movies, the smoothness of motion is perfectly adequate.

However, I will say that with the resolution limited to just 1080p, you can really see that downscaling, detail and tonal graduation compared with a laptop or even many other higher resolution portable monitors.

I will say, however, that the two built-in speakers do provide a good depth of audio, which gives a far better audio experience than many other monitors, portable or otherwise.

Flicking through a few of the other Android apps, and for the most part, there is just enough processing power supplied by this Android operating system to plough through most tasks without too much issue.

Applications such as CapCut enable some video editing, although you do need to keep it light, and delving into a few Android games, while nice to see them on the larger screen, the system did struggle. But there again, the resolution is a little bit of an issue, as is the rather low refresh rate for gaming.

Where it did excel was with Google Docs and the Google Suite. That larger screen gave a much larger interface to type up and read documents, and whether it was typing on a document or scrolling through spreadsheets, the large font and space just make things nice and fluid.

Starting to push the processing again, and I loaded Lightroom to edit some photos again, which showed that there was a real issue with the lack of resolution for apps when displayed at this size. Essentially, it felt like the colour depth and the gradient handling just weren't up to scratch, and any issues just seemed to be amplified with this huge screen; however, the actual use and processing were absolutely fine.

As I started to run through the benchmarking tests, they reinforced that this is a mid-level Android device, perfectly good for basic use, browsing the internet, and streaming content. However, at all times, the lower resolution at 1080p on a 25-inch display just highlights those visual issues of lack of colour depth and detail.

Whilst you can weigh up the balance of cost, as this portable monitor does only cost $399, you can excuse some of that visual quality. And if you're looking for a portable display that can be used in meetings or in show kiosks, then it is actually a good option.

Through my test, running a series of benchmarking, streaming, and productivity tests on the monitor, I was able to get 5 hours of use. For me, I feel that's relatively decent. But if you want a monitor that lasts the distance, say half a day to a full day, then you will need to look at some sort of external power source for the monitor.

• Performance: 2 / 5

(Image credit: Alastair Jennings)KTC MegPad A25Q5 monitor: Final verdict

(Image credit: Alastair Jennings)

The KTC MegPad A25Q5 has so much potential. It looks great and, on paper, everything about it seems to point at a product that will meet many different criteria, from a sleek portable monitor that you can use at home or in the office to stream back content, do video calls, watch TV and play games. And, of course, you can do all of this.

It also offers a full Android 14 touchscreen tablet experience, so you can utilise all the usual Android apps, and you have full access to the Google Play Store, which does give it plenty more potential.

So, when it comes to a functional smart display, the KTC A25Q5 could have been exceptional. However, it's limited by the quality of the actual display, with all of the innovation seemingly put into its workflow and functionality rather than its main focus, display quality.

From the outset, the quality of the display just seems to lack clarity. The Android 14 operating system, whilst working perfectly and generally giving a smooth experience (aside from gaming, where it's a little bit limited), just looks a little bit soft on this 25-inch screen. And the reason for that is not the size of the screen, but the resolution, which limits its pixel density.

As I started to run through the performance tests with Geekbench and 3DMark, it highlighted the limited processing power of the monitor. Then, as I delved into the more important feature, the qualities of the display, using Datacolor Spyder X2, it really started to highlight the limitations.

Across the board, the results in the Spyder X2 were average, again reinforcing the lack of detail and clarity that I was seeing, either using Android or a direct connection into a laptop, for both Mac and PC. So, whilst this portable monitor has huge potential, it really is limited by that display.

The battery was a highlight and I wasn't expecting much, however, it did seem to last the distance with a decent 5 hours of use. All things considered, especially the price that this monitor offers, is pure flexibility.

The fact that it could be used as a large-scale Android tablet so that you can watch back media at okay quality, that you can plug it into your laptop to give a bigger display when giving a presentation, and the ability to plug in external media so that you can play back content on the larger display using the Android operating system, still makes it extremely useful, just not the high quality that I would've expected.

Essentially, the concept for this monitor is absolutely spot on, and it's very easy to see how useful and how much potential this monitor has. It's just so unfortunate that the quality of the display underdelivers and lacks the sharpness and polish that I wanted.

Should I buy a KTC MegPad A25Q5 monitor?

Value

Great value for money considering that you get a large-scale Android tablet, external display and media playback monitor in one

4

Design

The build quality, design and aesthetics all look great, and with a simple carry handle, it just finishes off the design nicely

4

Features

Checking through the features, and on the surface at least it certainly has potential

4

Performance

While the MegPad shows potential, the lack of processing power and low resolution let it down

2

Overall

The concept is valid and the design aesthetically pleasing, but it is let down by the real-world performance

3

Buy it if...

You want a large Android display

Having the Android OS on such a large scale is definitely handy, and native apps run smoothly with good integration into Google's ecosystem.

You want a meeting screen with Android support

Running meetings through the tablet offers a large display with a relatively decent webcam for PC-free conferencing.

Don't buy it if...

You need to watch movies.

For both movies and gaming, the power of the hardware is slightly lacking, and the depth and low resolution really highlight the image issues.

You need to edit creative media.

Again, while the large screen lends itself to use for creative media, the lack of power and low resolution cancel this out as a viable option.

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