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Grandinote Volta Streamer DAC
Grandinote Volta
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Posted On 29.05.2025
Last Update On 29.05.2025 Grandinote Volta
Grandinote Volta Grandinote Volta Grandinote Volta
Description Original Description is in English, other language texts are translations and can contain errors. EnglishDeutschSpanishTurkish Excellent and boxed.

 

Review by Christian Punter:

General Description Contrary to many similar devices that offer every conceivable input, output, and protocol, the Italian Volta does not try to be the equivalent of a Swiss army knife. Rather, it focuses on a single task that it aims to perfect. What we have here is a network player with a built-in DAC that Grandinote refers to as a “Streaming DAC”. The unit is remotely controllable from tablets, phones, and PCs or Macs and it reads audio files from Streaming Music sources, Ethernet-connected disks (NAS), and USB. There are no buttons on the device and there is no remote control handset. The Volta offers analog outputs on cinch and (Fully-Balanced) XLR. There are no digital in- or outputs and although the product does have a web interface, there are hardly any settings to be made. Quite literally, the Volta is Plug and Play. I was happy to find that although only UPnP compatibility is mentioned on the Grandinote website and in the user manual, the Volta is also compatible with Roon RAAT.

The Volta appears as rockchip-audio-dacmax in the Roon Audio Setup

In addition to audio, the Volta is also capable of outputting Ultra-HD video up to 3840×2160 pixels at 60P via its HDMI port, but I did not investigate this. This review will focus only on the audio part.

Magnetosolid

There are only two basic types of amplification designs: tube-based, and solid-state but Grandinote has set out to combine aspects from both in their products. They do this using what they call the Magnetosolid principle. So, what does this entail? The exact definition remains something of a trade secret, but what is revealed is that tube amplifier schematics are used without using tubes.

The term Magnetosolid is the union of Magneto and Solid. Magneto is for ferromagnetic components, referring to the output transformers while Solid is for solid-state components, as in the transistor output devices. Further, it’s mentioned that many of the design choices are a consequence of the tube schematics and that the products employ Direct-Coupling stages, meaning that no capacitors are used in the signal path. That last statement might be true for the Shinai integrated amplifier, but it does not apply to the Volta and Celio source products that both have inline capacitors, which makes sense because that is also typically done with tube products.

Project Background

The Volta project started in 2011 with the goal to transfer lossless digital music from a disk to the DA section. In order to achieve this goal, Grandinote arrived at seven important arguments which I copied below in a simplified and slightly paraphrased manner.

Point 1 of 7: CD versus “Liquid” Music – When playing a CD in the traditional way, we can’t avoid reading errors. There isn’t a CD mechanism that sounds like another. If they were perfect, they would sound the same. Mechanics make reading mistakes and the Sony-Philips correction algorithm “invents” correction, spoiling the sound of our CD. When ripping a CD, when errors are found, the reading is repeated block by block, until a bit-perfect duplicate is achieved. Today, some CD players perform a pre-ripping, just to eliminate these errors, freeing the music from the Sony-Philips correction algorithm.

Point 2 of 7: Problems using a computer as a player – With this solution, there are so many problems that it can cause more damage than the aforementioned CD player correction algorithm. That’s why many who have approached music via computer and a USB-DAC have preferred the old CD player. Some of these problems stem from the computer hardware and its power supplies or the operating system and its latency, as well as the computer’s ground noise which arrives in the DAC via the USB cable.

Point 3 of 7: Leave out S/PDIF and AES/EBU digital inputs – How to play CDs with the Grandinote Volta? One solution would be to use the S/PDIF or AES/EBU interfaces. This would permit the use of a traditional high-end CD transport with the Volta. However, in doing so, the playback would be compromised by the Sony-Philips correction algorithm. We prefer to connect an external CD, DVD, or Blu-Ray reader to the Volta via USB, which leads to error-free playback.

Point 4 of 7: How to best use the USB port – Wanting to connect an external CD, DVD, or Blu-Ray player to the Volta USB port, it’s essential to choose a unit that is self-powered through the same USB port. An external device, equipped with its own power supply, generates electrical noise. Through the USB cable, the electrical noise would then arrive at the Grandinote Volta. The same is true for external USB hard drives. It is best to avoid 3.5″ hard disks with their power supplies and to use 2.5″ port-powered USB disks.

Point 5 of 7: The best storage format – As explained above, the 2.5″ external disk is preferred, using the Volta USB port’s power. However, the best solution is a network NAS, using an access-point/router and ethernet cables. By design, an ethernet cable is isolated by pulse transformers. With this solution, the electrical noise, generated by NAS and its power supply, does not arrive at the Volta.

Point 6 of 7: Using a NAS via Wi-Fi – The connection to a NAS can be done via Ethernet or via Wi-Fi.

Wi-Fi is sufficiently powerful for the 16bit 44.1kHz CD resolution. For higher-resolution formats, we need a low-use free Wi-Fi channel, with few connected devices.

Point 7 of 7: Leave out S/PDIF and AES/EBU digital outputs – It is our belief that no DAC can match the sonic characteristics of the Volta, and thus, no digital output is required. Also, there are distinct advantages to having all the processes take place within the same device. The same circuits, separated by a cable, would not guarantee the same result.

 

Design

The Volta is a fully dual-mono design that runs entirely in class-A without any feedback and with Direct-Coupling stages (supposedly without capacitors between stages) and no less than 20 different dedicated power supply regulators.

I always thought that feedback is a fact of life as pertaining to amplification design, certainly when it concerns power amplifiers, and so I figured that what was meant is when a manufacturer states that “no feedback is used” that the amp merely employs no global feedback. Upon checking with the manufacturer, designer Massimiliano Magri responded, (slightly paraphrased):

“Feedback is part of the output signal that returns to the input. The Grandinote products have no output signal returned to the input, not locally, not partially. Really, my friends, Grandinote products are TOTALLY feedback-less!!!!.”

By sticking to Ethernet and USB connections, Grandinote aims to minimize reading errors and jitter. Indeed, even though I often use and prefer S/PDIF or AES/EBU connections, there is a higher potential for jitter with these interfaces due to embedding (muxing) of the clock signal within the music signal. The best alternative solution is to use I2S which carries separate lines for timing data and music but due to the lack of a standard, this format never obtained widespread use.

 

 

According to Grandinote, the Volta’s extremely accurate conversion to analog, the extensive power supplies, and the output stages derived from the company’s Magnetosolid principles, make the Streaming DAC “the most faithful system for digital playback ever made”. Well, there’s just a hint of Hyperbole there, I guess… but we’ll see!

Review Context

In the review system, I will be using the Volta on the Artesania Modular Floor Platform as well as on the dedicated Grandinote Combo Stand, connected with Driade Flow Link Reference 808 and AudioQuest Fire RCA cables to the Audio-GD Master 1 analog preamp, Jorma Trinity speaker cables, and a Belden 19364 power cable with Bals schuko and Oyaide C-004 IEC connectors, with the CH Precision A1.5 power amp driving the Magico S1 MkII speakers.

Listening – WiFi and Ethernet

As control software for UPnP connections, Grandinote recommends MConnect for iOS or BubbleUPnP for Android. I have and use both and they are indeed excellent choices. Another great option for Android devices is HiFi-Cast. For Roon, obviously, all the Roon-compatible control points will work, such as phones, tablets, and computers, either on Windows, Android, or macOS.

Unica app

At the moment of review, it wasn’t yet released but Grandinote is working on their own app called Unica which allows control of KODI and MPD, and by extension, I suppose anything UPnP. Highlights include compatibility with Tidal, Qobuz, Spotify, Deezer, YouTube, Netflix, and many to come, immediate search results, the ability to mount a NAS, the availability of lots of information about the artists in your media library, that can be viewed even with the HOST turned off.

 

Roon Ready

My listening started with the Grimm MU1, serving Roon via the RAAT protocol to the Volta over Ethernet. Although the Volta also does UPnP, I believe Roon is what most people will use it with. As I quickly found, much like the Shinai amplifier, the Volta impresses with a rare mix of virtues. It sounds BIG in the broadest sense of the word. The sound is propulsive, dynamic, and incredibly lively, and it’s all served in a soundstage that is both wide and deep and hugely engulfing, if not especially precise in terms of image specificity and layering. What’s rare is that these virtues are combined with smoothness, liquidity and deep tonal saturation. Even rarer is that the Volta also sounds wide open and intricately detailed yet never analytical. It achieves this through a presentation that is spritely, lively, and articulate in the midrange and treble, and full and smooth and even a little round in the bass. A term often used to describe this kind of bass behavior is lush. However, the Volta’s direct liveliness and attack make that I would rather label it as spritely and engaging, not necessarily as lush overall.

 

To more precisely map the Volta’s sound, I made a direct comparison with the Aqua LinQ Network Player and Formula xHD DAC, at ~20.000 euro, a comparatively costly combo that is also made in Grandinote’s home country Italy. The Grimm MU1 was retained as a server but now using the HQPlayer NAA protocol rather than Roon RAAT, because the LinQ does not support Roon directly.

Unexpectedly, this switch took me some time to get to grips with, for the Aqua combo now sounded comparatively small, dull and dry. Knowing that the Aquas are both incredibly neutral and not dull in and of themselves, apparently, without having noticed it just yet, the Volta must have quite a voluminous and rich sound. Further swapping back and forth unveiled what was happening. As I noted, the Volta’s bass is on the lush and voluptuous side, but not in a “hewn from granite” kind of way. Rather, it sounds full and energetic but in a slightly sweet and rounded manner that actually reminds me of tube products. Likewise, the soundstage is larger than I normally hear with most streaming and DAC products, and that includes the CH C1 DAC. Of course, I imagine, this is precisely what the designer was aiming for. After all, the intention was to combine the strengths of tube- and transistor designs.

Just as I am used to from many tube products, the Volta makes it easy to get sucked into the music and enjoy it, whilst making one simply forget to ponder any audiophile technicalities. And, as I would find, it has this effect on everyone who hears it.

As I went back and forth between the LinQ and the Volta, I noticed that my preference depended on the style of music that I played. For instance, where the Volta would invariably be utterly seductive with strings, vocals, and the overall ambiance, the LinQ and Formula xHD impressed me more when playing rhythm-driven music or whenever the highest precision was called for.

As mentioned, the LinQ and Formula xHD manage higher precision in the bass, and they also sound more neutral and linear. Strictly speaking, the Aqua combo is closer to the audiophile ideal, as well as my own ideal. And that’s only fair, given the combo’s much higher price of admission. However, musically speaking, a hugely compelling argument can certainly be made for the Volta. Much of it depends on how strict a listener is. Having heard so many streamers and DACs, I think it’s fair to say that the Volta romanticizes the sound to some extent and I don’t think I’m taking things out of context by stating that perhaps it also has a slightly larger-than-life sound, but you have to ask yourself, is that a problem? To answer that question, let’s return to my friend Niels and his system.

Niels’ system

As he requested, we took the Volta to Niels’ place where we listened to it again using Roon in combination with the Grimm MU1, the Zanden 6000 integrated KT120 tube amplifier, and the Magico Q3 loudspeakers.

 

Astute readers will note that I wrote Q3 and not Q5 as I have reported on several times in the recent past. Well, what can I say? Since recently, Niels is in the fortunate position to own both the Q5 and the Q3. The former require very stiff amplification and really only work well with abundantly powerful amplifiers such as the Soulution 711 and the CH Precision A1.5, or, indeed, as Niels found, the Jadis JA200’s as an exception in the tube amp department, albeit with a less precise bass but a wider soundstage and a livelier midrange. Indeed, the 711 has more warmth in the midrange than the Jadis amps! For some time, fellow reviewer and mutual friend Werner has indicated that the Magico Q3’s can actually be driven by a tube amplifier. Since Niels already had the Zanden amplifier but no compatible speakers, he jumped on a pair of second-hand Magico Q3’s when he saw them. And as it turned out, this did indeed work beautifully. Even I have to admit that, indeed, the Zanden 6000 drives the Q3’s absolutely fantastically, complete with great bass grip and superb articulation.

 

Niels’ normal DAC is the MolaMola Tambaqui, which is a great DAC that sounds not too dissimilar from the Aqua Formula xHD, if a little bit smoother in the treble and just very slightly warmer in the midrange.

Interestingly, Niels has heard and owned lots of audio components but still, the Volta managed to take him completely by surprise. Not only was it lively, brightly lit, expressive, and plenty detailed in his setup, it also provided much more of an organic sense to the music than the MolaMola DAC. The sound took on an indulging liquidity and flow and had a way of sucking us into the performance. And just as we heard it with the Aqua components, the MolaMola sounded comparatively duller. But is it, really? Or is the Volta extra open and expressive? As indicated, I’m sure it’s the latter but the question was, does that matter? Ultimately, it’s a matter of personal preferences as well as one of finding the best balance in any system. And with Niels’ Magico Q3’s, as well as with my Magico S1 mkII’s, it worked really well. As an interesting side note, I will mention that although Magico has the image of being very analytical, and this is certainly true for the Q5’s, the S1 mkII and Q3 are still very neutral but actually also quite friendly, not bright at all, and relatively smooth-sounding speakers. With these speakers, clearly, the Volta’s extra enthusiasm pairs very well, while their inherent high resolution also showed very clearly that the Volta is certainly not overbearing or etched in any way.

Although the Volta is hugely engaging, I noticed also in Niels’ system that the lower part of the frequency spectrum was less well-defined and a little softer and rounder than I prefer. But when discussing this with Niels, he felt that this was hardly noticeable and in any case very minor and easily worth it in return for the Volta’s strong aspects. The best compliment that the Volta can be given is that Niels was so smitten with it that he asked to keep the unit in his system for a little longer. During the week that I let him borrow it, he invited several of his friends over who all experienced the goodness of the Volta in the exact same way as he did. None of them mentioned any deficiencies in the bass. So, it’s only fair to say that maybe I am a little particular about bass precision and neutrality. The fact of the matter is that everyone takes different elements from the music as representing realism, or conveying excitement and emotion. Clearly, the Volta presents at least two of these aspects exceedingly well.

UPnP

Besides Roon, the Volta also works with UPnP sources and accepts a CD, DVD, or Blu-Ray optical drive via USB. I have no such external drive available and I wouldn’t think many people would choose the Volta for this either, so I’ll leave that option uninvestigated. What I do have, is a UPnP source in the shape of a jRiver Media Center installation on my Windows desktop computer. While this may seem horribly non-audiophile, past experiments (for instance when comparing UPnP with HQPlayer and Roon using the LinQ) have shown that the UPnP stream transfers perfectly despite the host PC being utterly mundane. More to the point, and from these tests, it’s not unthinkable that the Volta would sound different when using UPnP. So, let’s just put this to the test.

Comparing jRiver with UPnP and Roon via RAAT one directly after the other, there is indeed a difference in sound. As observed during tests for another review, UPnP sounds structurally different from Roon. With the Volta, UPnP is leaner and tighter than Roon (which I like) but also drier and less richly saturated (which now feels missed). In any event, both formats are responsive and work perfectly and both sound absolutely great, but even though I have often preferred UPnP or HQPlayer over Roon, now, I prefer Roon by a small margin. As always, YMMV, as this is a highly relative and ultimately a subjective matter.

In any case, I was surprised to find that the Volta works absolutely seamlessly even when repeatedly switching back and froth between UPnP and Roon. Not once did I encounter a hiccup. Clearly, its firmware is very well designed and rock-solid.

 

Combo Stand

If you’ve read the Grandinote Shinai review, you’ll know that this amplifier sounds quite different, depending on its support. In a nutshell, it sounds the tightest and most articulate on a sturdy platform, and most fluid and liquid when used on top of the Combo Stand. Would the same be true for the Volta?

My impressions as described thus far have been based on the Volta on the Combo Stand. So, let’s see what happens when it is placed on the Artesania Modular rack. Oh, yes, this turned out to make a similar difference! Even though the Combo Stand’s bottom level is relatively solid, the rack still has a marked influence on the Volta’s sound. However, it’s not exactly the same as with the Shinai amplifier when it is seated on top. Also, I can’t say that the differences are entirely as pronounced as with the amplifier. But still, what can quite easily be heard is that the Artesania platform makes the Volta sound more robust and direct, with more solid bass and fuller tonal saturation while the Combo Stand makes it sound leaner and cleaner. I’m not sure at all which of the two approaches is the most neutral, perhaps the Combo Stand is, but I can say that the Artesania platform combines superbly with the tighter and leaner UPnP sound. Likewise, the Combo Stand matches well with the comparatively fuller and richer Roon sound.

Of course, I am aware that there are people who think all this (Roon versus UPnP as well as the influence of Equipment Support) is nonsense for devices such as DACs and streamers. To those, I would say that’s all the better for them because it removes some variables and leaves only the choice of equipment. After all, the Volta proved to sound in multiple systems and on any support. To the other group, I will say that it can still be worthwhile to experiment with all of the system’s variables in order to get maximum performance.

Conclusion

It’s always nice to be surprised. I’ll be honest, upon the first appearance and just looking at it, I found the Volta to be extravagant but otherwise thought that it was yet another streamer. Furthermore, judging from the sub-par finish of its casing, I even felt that maybe it costs too much. But as it turns out, the Volta is anything but ordinary, not only in appearance but also in terms of sound. What this extravagant little box offers is peace of mind. Its buttonless and option-less, rock-solid design allows you to forget about all the digital-format-worries and stop tinkering with countless options, filters, and what have you. Much like one would expect from a good tube design, the Volta is a little bit euphonic and not strictly the most neutral or most accurate streaming source there in its price range, but it plays music in a hugely compelling, lush yet highly expressive, big, dynamic, and emotion-inducing manner.
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