{"id":38399,"date":"2024-08-09T12:50:05","date_gmt":"2024-08-09T10:50:05","guid":{"rendered":"https:\/\/www.hifi-advice.com\/blog\/?p=38399"},"modified":"2024-08-18T12:13:39","modified_gmt":"2024-08-18T10:13:39","slug":"xact-s1-music-server","status":"publish","type":"post","link":"https:\/\/www.hifi-advice.com\/blog\/review\/digital-reviews\/network-player-reviews\/xact-s1-music-server\/","title":{"rendered":"XACT S1 Music Server"},"content":{"rendered":"

Review sample provided by XACT<\/a>
\nRetail prices in the Netherlands:
\nXACT S1 Music Server: 12.000 euro
\nXACT Phantom LAN cable 1.2m: 3.000 euro
\nXACT Phantom LAN USB 1.2m: 3.000 euro<\/h4>\n

Six years in the making, the XACT S1 Music Server was created by Marcin Ostapowicz, the founder of the JCAT and JPLAY brands and author of some of the most innovative high-end audio products, such as audiophile Network Switches, Power Supplies, USB cards, and Network cards, as well as a range of cables. As the maker\u00a0explains on the XACT website<\/a>, the creation of XACT S1 stems from his quest to create a superbly sounding digital audio transport for himself, which brought him into high-end audio hardware development.<\/p>\n

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Whereas most competing music server designs use an off-the-shelf PC motherboard, Marcin has created everything inside the S1 entirely from the bottom up. That includes a 100% linear power supply with only linear regulators and no switching components, as well as a fully proprietary motherboard. The development of the server in this shape started in 2016. After three years, there was a final motherboard, and the following three years were strictly dedicated to fine-tuning, involving hand-picking selected components and meticulously testing all variables by ear.<\/p>\n

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Above, the custom building blocks can be seen – no standard motherboard here!<\/em><\/p>\n

As Marcin explains, standard motherboards have noisy power converters that interfere with other hi-fi components, and efforts at mitigating this do not address the root cause. Therefore, developing an entirely new motherboard from scratch with only audio playback in mind was the only way to go with XACT S1.<\/p>\n

The hardware is very important, but there’s more to making a good server. During more than 10 years of developing JPLAY, it has also become clear that the software has as much impact on the sound quality as the hardware platform itself. Therefore, the XACT Operating System was written from scratch and optimized for the hardware. Marcin explored all possible optimizations of the operating system and player\u2019s code, ultimately identifying the most harmonious combination for the S1\u2019s hardware.<\/p>\n

The S1 synthesizes all the audio research findings and experience in developing innovative audiophile hardware (JCAT) and software (JPLAY), and every product developed over the years has made an important contribution towards creating the XACT S1.<\/p>\n

Technical highlights<\/h3>\n

Housed in an aluminum case, the XACT S1 is a silent fanless design weighing 9KG with an extremely low-jitter OCXO clock with +\/- 5PPB frequency stability, Nichicon Muse flagship capacitors, specially-selected Industrial-grade4TB SSD (8TB available on request) with XACT Link drive cable, an extremely resistant OS SD card developed for military conditions, and 2x USB Audio 2.0 outputs (main and without 5V power bus) via gold plated high durability EMI shielded USB connectors. Music can be imported easily from USB drives and over the network. The server supports native bit-perfect playback up to DSD512 & PCM hi-res up to 768 kHz, 16-32 bits. Supported file types include DSF, DFF, FLAC, Apple Lossless (ALAC), WAV, AIFF, and MQA (pass-through).<\/p>\n

Server\/Player Software<\/h3>\n

The S1 server runs proprietary XACT Femtoserver UPnP software that talks directly to the built-in XACT S1 player. As the software adheres to UPnP standards, the server can also stream to other players on the network to create a multi-room system. Likewise, the XACT S1 player can be streamed to from other UPnP libraries on the network.<\/p>\n

The S1 is extremely simple to operate. It has only a power button that boots the device in 20 seconds. There are no other buttons and no settings to make on the server itself. Instead, the S1 is fully operated via a phone or tablet, and that’s where the available options and settings can be made neatly all in one place.<\/p>\n

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JPLAY for iOS Control App<\/h3>\n

The XACT S1 comes bundled with a lifetime subscription to JPLAY for iOS, which Marcin developed specifically for the XACT S1. The app runs on iPads and iPhones, and although it is not officially endorsed for MacOS, I found it runs perfectly fine on the original M1 MacBook Air.<\/p>\n

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The design brief for JPLAY for iOS was not just to create a superb user interface but also to minimize the network traffic between the app and the audio endpoint to the absolute minimum to ensure the lowest possible network noise and, as a result, the best sound quality.<\/p>\n

Having reviewed JPLAY for iOS<\/a> earlier this year, I can confirm that the software does indeed extract even better sound than other apps. The purity of sound, UPnP’s inherent sonic stability, and JPLAY’s absolutely superb interface actually made me set Roon aside and switch to UPnP, controlled by JPLAY, as my favorite app!<\/p>\n

If, like me, you were put off by the basic functionality of UPnP apps so far, you must try JPLAY. The software is a game changer.<\/p>\n

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JPLAY provides intuitive control of all the expected functions and a bunch more, such as streaming and local files accessible in one place, native Tidal, Tidal MAX, and Qobuz discovery features, other albums by the selected artist, associated artists, artist bios, extended playlist management, advanced search and sort, aggregated activity statistics, and multiple library views. And that’s only the start.<\/p>\n

\"\"<\/p>\n

JPLAY also incorporates several features that were thus far only available in Roon. For instance, the app has full streaming service integration and automatically shows other versions of the same album, such as the Qobuz version of a local album, as well as suggestions for other artists I might like. Another rare feature is the possibility to add tracks to playlists no matter where you access them, be it on the associated album, in the Queue, or another playlist. A Radio function is also included. Initially introduced by Roon, this is another feature that you will not find in other UPnP apps. This super-handy function auto-selects and plays music at the end of the now-playing queue based on music played earlier, as well as direct user feedback. You can teach the algorithm by thumbing it up or down. And, to top it off, the app offers a Focus function, which lets you quickly and easily narrow down the search results.<\/p>\n

For an in-depth report of JPLAY for iOS, please see the separate review<\/a>.<\/p>\n

\"\"<\/p>\n

Next: Configuration, Review Context, and Foreword<\/em><\/p>\n

<\/p>\n

Configuration<\/h3>\n

To get started with the XACT S1 and JPLAY app, you need only select XACT femtoServer as the source and XACT S1 as the player. Then, you can add your Qobuz and Tidal accounts, and that’s basically it.<\/p>\n

There are two ways to load music to the S1\u2019s internal drive. Over the local network via standard Samba sharing using the server’s IP address. The user and password are supplied on a Quick Start document. Alternatively, when a USB drive is connected to the USB-HDD port at server power on, a copy process is executed. XACT will shut down automatically once all files from the USB drive are copied.<\/p>\n

Once the files are copied, the server needs to be re-indexed, and the new data synced to the JPLAY app’s local database, which can both be done from the app. The resulting local database enables super-quick browsing and powers features such as Recently Played Tracks and retaining the playback Queue.<\/p>\n

Dual S1 Setup<\/h3>\n

The XACT S1 can function standalone as a music server and player (as reviewed), or it may be accompanied by a second S1 running bespoke Router\/Switch firmware to achieve the best sound quality. A single S1 can run either the Server\/Player software or the Router\/Switch software. The S1 cannot perform both functions at the same time.<\/p>\n

Basic Setup: XACT S1 as a music server\/player<\/em><\/p>\n

\"\"<\/p>\n

Dual Setup for the best sound quality: XACT S1 as a network switch\/router + Second S1 as a music server\/player<\/em><\/p>\n

\"\"<\/p>\n

To be released later: XACT N1 Network Switch<\/h3>\n

In addition to the XACT S1 in its Network Switch capacity, the company will also be releasing a more affordable Network Switch called the XACT N1, later this Fall. See the preview image below.<\/p>\n

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XACT Phantom LAN and XACT Phantom USB<\/h3>\n

Along with the XACT S1, the brand-new XACT Phantom LAN and XACT Phantom USB cables were supplied to use with the server. These cables are so new that they’re announced as “coming soon” on the XACT website at the time of this review.<\/p>\n

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The cables are directional and are both recommended to be used with the XACT ring closer to the S1. This means that the usual use of signal flow in the direction of the text only goes for the USB cable, where the text on the ring reads toward the DAC. For the LAN cable, however, the text reads toward the S1. It’s just something to keep in mind: Use the rings for both cables at the server side.<\/p>\n

Review Context<\/h3>\n

The XACT S1 will be listened to in the main system<\/a> in combination with the Precision C1.2<\/a> DAC. The rest of the system comprises the CH Precision L1<\/a> preamplifier, CH Precision A1.5<\/a> power amp, and Magico S1 MkII speakers. Available for comparison are the Grimm MU1<\/a> and Antipodes Oladra<\/a> Music Servers, the Aqua LinQ<\/a> network endpoint, and the Aqua La Diva M2<\/a> CD transport.<\/p>\n

Foreword<\/h3>\n

All music streaming protocols and playback methods have an inherent character. For instance, Squeeze and UPnP\/MPD sound quite different from Roon. The latter sounds full-bodied, smooth, and rich in tonality but not quite as crisp, pure, and direct compared to the aforementioned alternative formats. The same applies to desktop music playback apps, where, for instance, JRiver Media Center sounds smoother and more relaxed than Foobar2000, which sounds tight and controlled, even when the exact same output methods are used on the same computer with the same USB interface. Technically, this may not make much sense, but I accepted it as a fact of life. It’s also what inspired Marcin to create JPLAY Femto<\/a>: to improve the sound quality of music playback on a PC.<\/p>\n

Of the aforementioned formats, UPnP and its playback component, MPD (Music Player Daemon), have always sounded best to me. It’s just that, so far, the UPnP app interfaces have dropped the ball in terms of functionality, especially when compared to Roon’s feature-rich interface. But JPLAY for iOS<\/a> turned this around! Soon after I reviewed this fantastic app, I switched back to UPnP and have not looked back.<\/p>\n

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For almost two weeks, the XACT S1 continuously ran music to the Denafrips DAC so that I could perform other tests with my main DAC simultaneously.<\/em><\/p>\n

Running In & Stability Test<\/h3>\n

Although the S1 was a demo unit that had been used before, the XACT Phantom LAN and Phantom USB cables were brand-new. Marcin advised that they will need 200 hours to fully break in. I made sure to allow 200+ hours before doing any listening.<\/p>\n

This extended running-in period simultaneously provided an excellent stress test, as the app was loaded with a massive queue accumulating up to 4 days of playing time. Not once did the music stop playing, and the app never lost the connection. That’s impressive because I’ve experienced other UPnP servers’ interfaces becoming slow to respond or even freeze when attempting the same.<\/p>\n

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Initial Listening<\/h3>\n

The S1 offers two USB outputs, a Main output (DAC) and one without a 5V connection (DAC no 5v) to facilitate experimentation. It’s recommended to use the main USB port, and since the C1.2 DAC only worked with the powered port, that’s what I used.<\/p>\n

For my first impressions, I listened to the XACT S1 using the supplied XACT Phantom LAN and XACT Phantom USB cables. The Phantom LAN was connected to the\u00a0Silent Angel NX switch with Genesis GX Clock<\/a>, and the Phantom USB cable was connected to the CH C1.2 DAC.<\/p>\n

As I was already familiar with the JPLAY software, I felt right at home with the XACT S1. Power on the unit, select the Femtoserver and S1 player, sync the library, and that’s it. Naturally, you can also set various preferences, such as default queuing behavior, but the app is basically good to go using its default settings. As a visiting friend found, even if you’re using the software for the first time, it is intuitive right away.<\/p>\n

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I must admit my expectations were partly primed due to my earlier experience with UPnP in combination with the Antipodes Oladra<\/a> and the Melco N5-H50<\/a> and, prior to that, the Melco N1ZH<\/a>. On the other hand, I read several reports while assembling data for the technical details of this review, praising the XACT S1 for its “analog”-like sound. This made me wonder what the S1 would actually<\/em> sound like. Would it be clean, pure, and direct, as one would expect from typical UPnP? Or would it be smooth, rich, and organic, as one might expect from an audio component described as sounding “typically analog”?<\/p>\n

As I soon found, the S1 is neither. Or both, depending on how you look at it. What the XACT S1 provides in combination with the XACT Phantom LAN and USB cables is a uniquely nimble and articulate yet smooth and lush presentation. It’s a combination you usually do not encounter. Last month, I reviewed the Melco N5-H50, and the XACT S1 reminds me of it for its unique blend of technical excellence and natural flow. The XACT S1 takes these strengths and adds an extra dose of lyrical involvement, smoothness, liquidity, and soul. What’s interesting to note is that I refer to the Melco being used as a server streaming directly to the C1.2’s built-in renderer versus the XACT S1 being used with USB. As I repeatedly found, most servers sound comparatively mechanical or analytical via USB, but the XACT S1 positively deviates from this. It is one of the select music servers that I feel sounds lush and organic via USB. No doubt, this is where the JCAT experience has come in. The Antipodes Oladra and Taiko Audio Extreme also make the interface work, but I have never heard this kind of performance from a server at the XACT S1’s price point.<\/p>\n

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Next: Comparisons, Tweaks, and Interim Score<\/em><\/p>\n

<\/p>\n

Comparisons<\/h3>\n

The XACT S1 becomes even more impressive when comparing it to the Antipodes Oladra running in UPnP\/MPD mode, using its USB output, and being controlled by the JPLAY app. The Oladra is one of the select few servers that I encountered that sounds organic via USB. As the company’s flagship product, it carries a very serious price tag, which makes the S1 seem almost affordable.<\/p>\n

To start the comparison of the two servers, I used both using their native footers, placed directly on the same HRS EXR rack, and powered with the same power cables. For the time being, I left the XACT S1 connected via the XACT Phantom network- and USB cable while using the Oladra with my default network cable and Mad Scientist Prime USB cable<\/a>. As regular readers will know, Antipodes servers have always excelled in sounding smooth, lush, and organic, and the Oladra is the culmination of this. But to my astonishment, in these respective configurations at least, the two servers sounded more alike than different.<\/p>\n

Both servers excel in presenting the music in an effortless, fluid, well-saturated, free-flowing, and emotionally engaging manner, and in these areas, the two are rather evenly matched. Where the two differ is in the balance between relaxed creamy smoothness on the one hand, and agility, crispness, and expression on the other. The Oladra basks in the former, while the XACT S1 lands between the midpoint and the latter of the two extremes. Both servers are deeply musical, but the Oladra is rounder, sweeter, and more forgiving, whereas the XACT S1 is crisper and more revealing.<\/p>\n

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So far, I have been using the XACT Phantom LAN and XACT Phantom USB cables with the XACT S1. Meanwhile, the Oladra was used with one of my standard (but carefully selected) Cat 6 ethernet cables, which I use for all my network audio components, and my current favorite USB cable, the Mad Scientist Prime USB. Now, it was time to investigate the impact of the XACT Phantom LAN and XACT Phantom USB cables.<\/p>\n

First, I swapped the XACT USB cable for the Mad Scientist Prime USB. This was interesting, as there were, again, certain commonalities between the two cables. Both cables deliver a full-blooded and profoundly musical delivery, and neither cable adds anything in the way of artifice or clinicality. But there are noteworthy differences. Specifically, the XACT Phantom was more fluid, light-footed, relaxed, airy, and refined, whereas the Mad Scientist was more sonorous, robust, impactful, and expressive. Having identified these differences, I re-compared the two servers using the same USB cable, but this had little impact on the server’s differences that had already been identified.<\/p>\n

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Next, I swapped the XACT Phantom LAN cable that was connected to the XACT S1 for one of my standard Cat 6 ethernet cables. Oh, boy, that made quite the difference! For better or for worse, the standard cable provided a leaner, more articulate, more direct, and more expressive delivery. Granted, it was definitely not as smooth, liquid, or full-bodied and arguably less organic, but for my taste and system circumstances, the standard cable provided a more exciting balance, which I preferred. This is not to say that my standard cable performs the same as the Phantom LAN, far from it, in fact!<\/p>\n

The XACT Phantom LAN cable is pivotal in enhancing the server’s inherent smoothness and organic nature. As such, it becomes an important tool that can be used according to taste. Add the XACT Phantom LAN for maximum liquidity and smoothness, or use another cable for enhanced crispness and spriteliness. Now, using the servers under identical circumstances, the difference between the two also jumped from relatively small to very pronounced. Such can be the impact of a network cable!<\/p>\n

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Tweaks<\/h3>\n

As standard, the XACT S1 sits on compliant rubber-like footers that almost beg to be substituted with upmarket units. Speaking of footers, the XACT website actually announces that Ceramic Footers are coming soon, and I’ll be looking forward to hearing them. Currently, my go-to aftermarket footers are StillPoints Ultra SS V2 and a range of Ansuz Darkz Resonance Control<\/a> footers, of which the T2 are my favorites. Granted, they cost a small fortune, but they really are much better than any of the Finite Elemente Ceraball<\/a> variants that I used previously.<\/p>\n

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The Oladra’s constrained-layer-damping footers are too tall to allow the use of the Ansuz Darkz, but, as I found earlier, this server works really well with the StillPoints footers, so these are what I used. When also adding StillPoints under the XACT S1, sure enough, the impact was enormous, greatly enhancing the transient sharpness and apparent pacing. But in this case, the StillPoints pulled the sound a little too much in the analytical direction. The Ansuz Darkz T2, on the other hand, provided a balance that I found ideal: subjectively faster, more articulate, and more expressive than with the standard rubber footers but retaining saturation and smoothness.<\/p>\n

Now, the XACT S1 impressed me even more. When used with its standard footers, the S1 sounds smooth and unhurried but never slow or smeared. In that sense, it really does indeed represent the best that analog has to offer, but it does not do it in a euphoric, thick, or overly creamy manner. When used with the Ansuz Darkz footers, it retains its innate naturalness and flow, gains excitement and expression, and becomes even more enthusiastic. Used like this, the server sounds exceedingly neutral, transparent, linear, and precise, yet, there’s absolutely nothing technical about the performance. Quite the contrary, as it remains simultaneously beguilingly fluid, airy, and highly refined.<\/p>\n

Interim Score<\/h3>\n

At this stage in the review, it’s clear that the XACT S1 could be viewed quite differently, depending on which cables and footers are used. So, let’s do a quick recap.<\/p>\n

When used with its standard footers and with XACT Phantom LAN and USB cables, the sound can be described as representing what is often aspired to as an “analog” reproduction. That is to say, the music flows freely, sweetly, and organically in a liquid manner without any mechanical or artificial nature and no hardness. Used like this, it reminds me of the Antipodes Oladra but with the balance between smoothness and precision changed from the far left to halfway right of the center.<\/p>\n

When used with my standard cables and Ansuz Darkz T2 footers, the sound becomes more neutral, articulate, and direct, less smooth, saturated, and organic, but also more revealing and precise. Used like this, it reminds me of the Melco N5-H50 for its neutrality and transparency, but with an even more spritely and expressive nature as well as enhanced liquidity and lyrical involvement.<\/p>\n

Clearly, there is a huge advantage for a range of products to be made by the same manufacturer with a single goal in mind. In either guise, the XACT S1 delivers massively. It’s superbly evenly balanced, and thanks to this, it can be tweaked either way, just as preferred.<\/p>\n

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Versus CD<\/h3>\n

In this day and age, it seems CDs are hardly used anymore. It’s partly a matter of convenience, and I admit to not playing CDs as often as I used to. But still, I find that owning a superb CD transport is a huge benefit. Not just because CD can still sound very good, but also because it is an inherently stable platform. Unlike a certain music software suite, CD players usually do not get a software update every two weeks, after which it’s a guess as to how its sound will have changed.<\/p>\n

My transport of choice is the Aqua La Diva M2, and amidst the ever-changing forest of music servers, streamers, and their software, it is my dependable tower of strength. In case of doubt, I can always rely on the player to sound the same as it always did.<\/p>\n

Dependability aside, the La Diva M2 remains one of the best digital sources I have heard. It’s only been bettered by servers or streamers in very specific areas but never across the spectrum. Traditionally, and for the longest time, CD used to be better in fluidity, refinement, and air, in other words, the sense of analog flow. But servers have made massive performance leaps in the last handful of years, and the XACT S1 is not the only server that sounds analog-like in terms of liquidity and flow. But there’s more to convincing lifelike sound than that. Spontaneity and transient behavior, for example. It’s not often talked about, but this is what LP can do so incredibly well: being fluid and free-flowing while having immediate transient behavior as well as eternal decay. Given a good recording, LP can truly excel at combining these opposite qualities. But a good CD transport can usually still get closer than most servers. And this is precisely where the XACT S1 sets another benchmark!<\/p>\n

Under identical circumstances such as power cable, rack type and position, footers, and digital interconnects that sound as similar as possible, and of course, playing my own CD and its rip, the XACT S1 sounds almost indistinguishable from the La Diva M2. Honestly, it took me the best part of half an hour to try and identify what differentiates the two. But in the end, I could not reliably tell them apart. If that sounds like faint praise, let me add that the Diva M2 possesses an unusually refined performance, which has so far been impossible for any server to deliver via any connection method, and certainly not via USB!<\/p>\n

Next: more comparisons and Conclusion<\/em><\/p>\n

<\/p>\n

UPnP and Qobuz<\/h3>\n

The S1’s software adheres to the UPnP standard, which means that the Femto server can also stream to other endpoints on the network to create a multi-room system. Likewise, the XACT S1 player can be streamed to from other UPnP libraries on the network. Here, the JPLAY app comes in extremely handy as it always allows the user to combine or filter between the various local and online libraries.<\/p>\n

I have tried both external streaming variants, but in all cases, the sound was always the most coherent and expressive when using the S1 as an integrated server and player. Upon checking with Marcin, he confirmed that when music files are played from the built-in server, the playback is direct (inside the unit), and the network connection is used only for controlling playback. In other words, the music stream is not sent to the switch and router and back but remains inside the unit.<\/p>\n

This certainly goes some way to explaining why the server sounds so special. But it can’t be the whole story because the S1 also sounds absolutely superb, streaming from Qobuz<\/a>. I did many comparisons using my own CD rips as well as Qobuz downloads, and found that, sometimes, the local files sounded better. But other times, the streaming files actually sounded better! This was especially the case with more modern music where I presume the shorter and more direct export path has an advantage versus the more extensive production required for CD mastering and stamping. Even so, when there were differences, they were small enough to ignore, and without an AB comparison, I would not be able to identify a streaming source from a local source.<\/p>\n

Roon<\/h3>\n

Roon can work well in the right system, but in the context of my system, it has a rounded and rhythmically- and dynamically restrained quality to it, whether running on the Antipodes Oladra or the Grimm MU1, that I do not hear with UPnP in general and the XACT S1 in particular. The XACT S1 is easily as smooth and fluid as Roon on my best server, but it is more organic, as well as more rhythmic, expressive, and communicative. It’s worth noting that a running Roon Core on the network has an audible “rounding” impact on the sound, even when not used for playback. Therefore, the full extent of the XACT S1’s performance is most pronounced when the Roon Core is stopped, the server is shut down, or the server is disconnected from the network.<\/p>\n

Conclusion<\/h2>\n

With a custom 100% linear power supply with 100% linear regulation, a fully custom motherboard, a custom Operating System written from scratch and optimized for the hardware, and proprietary Femtoserver software running, all under control from the superb JPLAY for iOS app, the XACT S1 is a truly unique proposition.<\/p>\n

The server is so utterly even-handed, neutral, and well-balanced, yet so utterly free from artifice or traditional “digital” artifacts, that to summarize it as sounding one way or another is selling it short. Whereas most music servers excel in certain areas, the XACT S1 performs at the highest level across the board. Precisely thanks to its natural<\/em> neutrality, I can see it fit right in with any system. Unless one is looking to add hysteresis-like roundness or euphoric coloration deliberately, the XACT S1 is the closest thing to analog-done-right in a digital music server.<\/p>\n

When the same team designs every segment of the digital front end, you get a normally unattainable opportunity for synergy. This shows very clearly when using the XACT S1 server in combination with the XACT Phantom LAN and USB cables, which yields a performance that, even more so than the server by itself, exemplifies what is often aspired to as an “analog”-like reproduction. The distinguishing factor with the XACT S1 is that it remains uniquely nimble and foot-tappingly rhythmic, highly transparent, and highly resolving, in addition to being deliciously liquid and smooth.<\/p>\n

The XACT S1 sounds simply superb, and I cannot recommend it more highly. The only provision is that it works with UPnP to achieve the best possible sound quality. But if you are willing to live without Roon, the JPLAY app makes the transition as painless as possible.<\/p>\n

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 <\/p>\n

External Links<\/h3>\n

Manufacturer: XACT<\/a><\/p>\n

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