General Information


  • Dimensions: 20*10*90mm
  • Net Weight: Approximately t 6g
  • MQA Support: X8
  • Sampling Rate Indicator Light: Supported
  • D/A Chip: ESS ES9281C PRO
  • Sampling Frequency: Up to 32Bit/384kHz
  • DSD: Up to 128
  • Output: Single-ended 3.5mm headphone port
  • Total Harmonic Distortion+Noise: 0.0008%
  • Signal-to-Noise Ratio: 117dB
  • Channel Separation: 70dB
  • Frequency Response: 20Hz-40kHz (±0.1dB)
  • Output Power: LR 55mW@32Ω 3.5mm SE
  • Power Connector: Type-C
  • Supported Systems: Windows, Mac OS, iPad OS, Android, iOS or newer systems.
  • (For iOS users, the Lightning OTG cable has to be purchased separately.)

1. The Hi-Res Audio Certified S3 Pro features an ultra portable design which is only 0.79 inches (20mm)

2. The newly upgraded 8X MQA support allows you to enjoy a special audio experience ever.

3. S3 Pro built in a Powerful ESS9281C PRO DAC Chip with Low power consumption, ultra-low distortion and close to 0 noise. PCM supports up to 32Bit/384kHz, DSD128.

4. Fully experience TIDAL Masters, HiBy Music and even Apple’s newly-launched spatial audio and free lossless audio by using S3 Pro.

5. Compatible with iPad OS, Android, iOS, Windows, Mac OS or newer systems.

6. Convenient enough for practical use! S3 Pro supports wire control earphones with a microphone, allows you to answer phone calls without pulling it out from your mobile phone.

7. Outstanding cable (Mixed Braiding of 2 core high purity silver + 2 core OFC wires (60 strands each).) ensures your awesome music and 4 Panasonic capacitors are added for an enhanced listening experience.

8. Features Sampling Rate Indicator Light, which lights up in different colors, synchronized with the sampling rate of the currently played track.

9. Hi-Res Audio certified

10. 3 Tuning Styles offered by S3 Pro:
a). Transparent treble, bright , clean, crisp and detailed.
b). Tonal balance with a pure pleasing sound.
c). More prominent bass with incredible elasticity and a phenomenal depth.

11. No matter where you are, just plug and play with any operating system, without any power charging.

What’s in the Box:

S3 Pro × 1
USB-A adapter × 1
Warranty card × 1
User manual × 1


Latest reviews


500+ Head-Fier
Hidizs S3Pro – tiny high-tech USB DAC with MQA
Pros: good sound, enough power from such little device, LED, MQA, 32bit/384kHz
Cons: no volume buttons, DSD128

Seems that Hidizs company is on march with the release of new products this year. A whole bunch of USB dongles, DAC/amps and several IEMs. Most of the products have either became a bestseller or joined the leading tribe, at least. The last announcement was S9Pro – more powerful and revised version of S8/S9 type-C ultraportable DAC/amp that won several customer polls in social networks as one of the most balanced / feature-packed options. The passion has not yet subsided while Hidizs has announced S3Pro type-C USB DAC dongle with fresh design and MQA support – which is the topic of our review for today.

What makes S3Pro different in comparison to S9Pro, for instance? Most apparent are: significantly smaller and more handy form factor which is more likely to fit into any pocket and 8x MQA support that was not available in S8/S9/S9Pro dongles. The rest of the features are quite close, some of which are slightly more advanced in older series with only one that would really matter – the output power. Let us remind you that S9 produced 90mW @ SE / 120mW @ BL outputs (for 32Ohms load) while S9Pro has jumped up to 100mW @ SE and 200mW @ BL which is astonishing for such size and has made this dongle one of the mot powerful portable devices. Similarly, S9Pro supports DSD up to 512 and PCM up to 32bit/768kHz. Now, let’s look at new S3Pro specs:
  • DAC: ESS9281C PRO
  • DSD: up to 128
  • PCM: up to 32bit/384kHz
  • MQA: up to 8X unfold (Tidal Masters, HiBy Music, etc)
  • Interface: type-C, USB A converter
  • LED: sampling rate indication
  • Output type: 3.5mm SE, supports in-line remote and mic
    • Output specs:
      • Power: 55mW @ 32Ohms
      • FR: 20Hz – 40kHz
      • SNR: 117dB
      • CH Separation: 70dB
      • THD+N: 0.0008%
  • Size: diameter 20mm, thickness 10mm
  • Weight: 6g
  • Hi-Res audio certified

So, the difference in power output is apparent but still much better than in most of the smartphones. 55mW @ 32Ohms is a good figure, almost 2X as much… Anyway, in such comparison between S3Pro and S9Pro we can see very different targeting – one is made for maximum versality + Hi-Res streaming services and the other, more powerful one, to retrieve maximum quality from offline audio collection.


S3Pro packaging and design:
Hidizs S3Pro made its way from China in a perfect state and totally undamaged. The main reason for keeping box shape in a perfect condition during the transportation is that Hidizs used hard plastic box with cardboard outer layer this time.
Besides that, such box can further be used as secure storage case for S3Pro. Outer layer contains all necessary technical/manufacturer data and product graphics at facing side.
Box contents are:
  • S3Pro dongle
  • USB A adapter
  • Warranty card
  • User manual
  • Plastic storage box (i.e. main box)

Not much, no additional clip. Although, the purpose of this device is fully covered by the box contents except for Lightning adapter for iOS users. Peculiar thing is that there is a special Lightning to Type-C adapter cable that Hidizs has developed for iOS and S8/S9/S9Pro dongles but it wouldn’t do any good to S3Pro users since it has integrated Type-C cable. We hope that Hidizs would release Lightning to Type-C adapter in a similar form factor of their Type-C -> USB A to satisfy iPhone fans.


Regarding design and choice of materials: S3Pro is fully made of aluminum, feels sturdy and solid. Our sample has “gun metal” color but there would be some other color options to choose from. Round notches forming concentric circles radiating outward together with sampling rate LED indicator at the center of the top (facing) side are playing the main role in S3Pro design. Reverse side has nothing to catch a glance at while the SE output is located on the edge. The opposing side of the edge is where the integrated 2 core, 60 strands OFC wire comes from and which ends with Type-C connector in aluminum wrap.


Twisted cable is thick enough to last long, additionally equipped with anti-banding protection. And yes, S3Pro is very small, close to a size of one US cent with only the significant thickness showing that we are dealing with tightly packed high-quality element base. Such small dimensions are much easier to fit into a pocket together with a smartphone. No need for additional clip to hang this dongle on your clothes like with S9, for instance. When connected to a smartphone, S3Pro feels more like a regular IEM cable with large aluminum Y-splitter or other design furniture on it, rather than a separate device.

In overall, S3Pro design is great. It is made of durable material, looks great, perfectly crafted, has active multi-color LED that shows sampling rate and it is very small for such sophisticated features.


Device in use:
Similarly to S8/S9 series, this DAC requires type-C interface connection to smartphone or PC and USB-A adapter from the bundle to be able to connect to PCs that are not equipped with type-C USB port. Android-based smartphones require some applications that would implement USB OTG function and force audio stream to pass to S3Pro. Such as HiBy Music app, UAPP, etc. Or streaming services like Tidal with MQA support to use S3Pro as unfolding processor. We have tried all features with Xiaomi Redmi Note 8Pro running Android 10 and HiBy Music V4.1.0 b.5546 and found no problems in the consistency and logics of this device operation. Switching back and forth between different types, containers, quality and formats of tracks, changing volume, reconnecting didn’t cause any issues which means that the current FW is stable and reliable.

Not sure whether any updates would be available in future but what we would really expect from Hidizs is to release ASIO drivers for Windows 10/11 in the nearest future. It would provide more control over the resulting quality when connected to PC. For now, S3Pro is natively recognized by Windows OS as USB DAC, has no apparent audio lag but only allows to use WASAPI transport in such popular audio software as Foobar.
LED identifies sampling rate but when there is nothing being played for more than 5 seconds – S3Pro LED goes off. We would prefer some indication of “standby” state just to know that S3Pro is correctly connected and consumes smartphone battery charge.


As usual, be sure to set the volume in an app to lower level after connecting S3Pro to any device since it might be set to maximum on the first power cycle. Additionally, in order to control volume in DSD over PCM/DSD native modes with HiBy Music app – volume control should be set to “Hardware volume” in Settings->”Volume Mode” and USB device volume control should be unlocked (USB output setting -> USB Audio volume lock -> Unlock).

Now, about the firmware. First of all, S3Pro is a flashback to what was initially introduced in Hidizs Sonata type-C audio cables/dongles – different FW versions for different purposes. But now, instead of different processing paths, S3Pro firmware versions would cover 3 tuning styles. The default one would be “Tonal Balance” whereas other two (treble and bass-oriented) would be available at Hidizs website support section for further manual uploading. (Interesting feature that needs more development from Hidizs: allowing end-users to tune sound to their liking in some dedicated smartphone app that would also allow to push different FW to S3Pro.)

One thing noticed is that S3Pro case heats up noticeably during audio processing and stays ~47C until music is stopped. Perhaps, very tight space inside and aluminum chassis are playing the main role in heat dissipation as a result.


In general, we liked it. We have tested it with different fairly neutral headphones like Hidizs MS1 / MS2, and impedance up to 32Ohm. In such combination and loaded with “balanced” firmware, the output power is quite enough for good driving ability at high volume (half the level). If you go higher than half, noticeable distortions in the sound caused by a lack of power step in – the sound becomes louder, but the quality on treble and midbass begins to suffer. Therefore, we can conclude that there will be no problems with headphones up to ~ 32-50Ohm even in noisy environment. Higher loads are better for enjoying in quiet environments.

Despite the fact that the firmware is balanced, the bass portion is quite pronounced which enlarges stage size and volume. Bass is deep, well-defined and does not overwhelm the rest of the frequencies. Midbass is powerful and dynamic, with excellent attack and moderate pitch – not too sonorous and not ruining the overall impression of tonal balance. Mids are full-bodied, a little thick due to the lower part of the range, which is rather a plus (certainly not dry or flashy thin). Treble is clean, but simplified in detail – sounds accurate and doesn’t hurt with sibilants, but not astonishing in terms of the amount of details. The overall resolution as well as the stage size are average – neither disappointing nor astounding, but quite impressive for a device of this type. Significantly better than a smartphone, but worse than a good DAP in $100-200 price segment.

As a result, the sound is very good, especially considering the main purpose and size of the device. More than enough to deal with Hi-Res streaming services with noticeably better sound quality and drive than from a regular smartphone.



Truthfully, it is a tough decision for us, personally, which device to choose from a whole bunch of “S” series Hidizs type-C DAC/amps. S9 and its Pro version have BL outputs and outstanding ability to drive significant loads. S3Pro is less capable in this respect but offers MQA support for streaming services or offline MQA collection. We think that this choice is more about lifestyle and personal preferences in music. Maximum mobility and constant curiosity in current music trends would definitely be better off with Hidizs S3Pro, whereas S9/S9Pro are more closer to calm, desktop type of use with once established audio taste and music collection. If to consider on its own, S3Pro is a tiny piece of tightly packed and perfectly crafted technology, both software and hardware-wise, that totally does its job, yet delivering much better sound quality than a regular smartphone or PC and driving end headgear much better. With the declared price and features, we think that Hidizs has managed to create another participant for its winner formation.


100+ Head-Fier
Hidizs S3 Pro
Pros: - Great 8X MQA Unfolding
- Polished ESS tuning by Hidizs
- Sparkly and vibrant timbre
Cons: - Power limited up to 100 Ohm for full dynamics
- Runs slightly warm on max resolutions

Hidizs S3 Pro​


DAC Chip: ESS Sabre ES9281C PRO (Single)
PCM 32bit – 384khz 8X MQA DSD128, SNR: -117dB, Power: 55 mW 32Ω , USB Type-C Male, 3.5mm SE (Microphone: YES), 6g, Aluminum Chassis, SPC Cable

Listening Equipment: Etymotic ER4SR, HZSOUND Heart Mirror, VE Monk GO, TIN HiFi P1, Moondrop Aria. Source: USB 3.2 Samsung S20 (Tidal)


  • Sparkly clean and clear neutral timbre
  • Crisp natural tonality with pristine coherence
  • Balanced energetic dynamics, realistic vibe
  • Great Treble textures and extensions with crisp decays
  • Fast Mid-Bass vibe with rich textured body, equally fast decays
  • Natural Mids that’s not too forward nor recessed, richly textured and smooth.
  • Mild Sub-Bass with equally mild seismic feedback
  • Crisp nuanced and smooth details retrieval, very transparent
  • Realistic toned guitars, cello, percussions, and piano
  • Reference class speed and transients handling, amazing dexterity
  • Decently sized soundstage with natural feel to the spatial imaging
  • Great separation of layers with precise holographic projection
  • Good driving power, 75/100 volume to drive Tin HiFi P1 to proper listening levels
  • Great synergy with anything (no lower than 95db of sensitivity & over 100Ω)
  • Great clean black background even on high sensitivity IEM (122db Moondrop Aria)
  • Very conservative on battery drain


  • Power limited to below 100Ω 96db Sensitivity
  • Bass performance is milder than the bigger siblings Hidizs S9 and S9 Pro
  • Less forgiving to poor quality recordings or sources
  • Soundstage not as wide as the top performers
  • Able to drive magnetic planars, but the dynamics are audibly milder
  • No hardware volume adjuster
  • Slightly warm to the touch when playing maximum resolution on MQA (Purple level)


Hidizs S3 Pro. Alright, when I read about the announcement of S3 Pro not too long ago, I asked Hidizs for a review unit for my #donglemadness project (during the 40 dongles test phase). So this unit here with me is not purchased with my own money – Hidizs agreed that I am free to express my findings freely and so here I am sharing my impressions on it.

This tiny, cute dongle is quite an eye candy. However, what’s more important is what’s inside. Consistent with Hidizs adept tuning competencies, the S3 Pro does share the same refinement as exhibited from the bigger siblings of Hidizs S9 and S9 Pro – both of which rates very high in my book. The overall tuning is very polished and crisp, faithfully neutral, and sparkly. I daresay that among the eight ES9281C based dongles I have tested so far, this S3 Pro sits a step above the likes of ddHiFi TC35 Pro, hiliDAC Audirect 2SE, ATOM2 and HiBy FC3. And playing on the same level with Questyle M12 and THX Onyx – with the M12 having slight upper hand with more power and the THX Onyx being wider sounding. The only ES9281C that remain on top of the chain would be hiliDAC Audirect BEAM 2S and that’s understandable because BEAM 2S playing field is on the TOTL side with Hidizs S9 Pro, Ovidius B1, iBasso DC04 and A&K PEE51.

I have opted to use this S3 Pro exclusively on Tidal Masters, the biggest appeal of this S3 Pro being able to unfold 8X MQA tracks. I believe that’s the maximum available now. Admittedly there’s mixed feelings when it comes to the subject of MQA. There’s equally enough number of people opting to avoid MQA at all costs as it is with those who choose to embrace it. I was one of those who opted to bail out of MQA a few months back, preferring to stick to the good old 44.1/16 FLAC. But I am not opposed to advancement and from what I have observed so far, Tidal especially has been burning the midnight oil to improve MQA experience and I have heard enough feedbacks that MQA is an indulgence worth trying. So here I am back with Tidal, and I am glad I made that decisions. What I am hearing, audibly better spatial imaging and crisper details on the extended regions for records that contains them. The S3 Pro being the latest Dongle in the market to cater for this segment performed greatly and with assured confidence. The only negatives that I am hearing would be the existing artifacts contained within the original recordings or remasters. S3 Pro exhibited great balance between technicalities and organic musical presentation. I absolutely love listening to Diana Krall, Suzanne Vega, Morrissey, and Madonna Masters albums – especially S3 Pro pairing with HZSOUND Heart Mirror, the immersion was nothing short of amazing, the MQA opens up sonic spectrum that was not as audible on my traditional FLACs. Lastly the S3 also impressed with very clean background free of any floor noise even with the super sensitive 122db Moondrop Aria. Due to S3 Pro ability to handle Tidal MQA without any crackling issues as encountered with the likes of Questyle M12, hiliDAC Audirect 2SE & Audirect ATOM2, this S3 PRO rates very highly from my POV.

However not all is dandy. S3 Pro falls short on outright driving power and I believe this is quite forgivable because Hidizs already have S9 and S9 Pro to cater for much more demanding use that include Magnetic Planars and High Impedance heavyweights. For my own personal use, the S3 Pro performs greatly with HZSOUND Heart Mirror, VE Monk GO, Moondrop Aria and Etymotic ER4SR. This is something that is still quite applicable as probably 70% of users base are running on 8 to 32Ω IEMs and with sensitivity no lower than 98db.

Perhaps somewhere in the near future Hidizs would combine the feature of S3 Pro and S9 Pro to make the ultimate TOTL? that would be really something to wait for.

Find out more about Hidizs S3 Pro from Hidizs Official Store

Best Pairing: Low impedance IEMs/Headphones not exceeding 100Ω

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500+ Head-Fier
In The Small Pot Is The Good Jam
Pros: Excellent size/sound/power/price ratio.
- Possibility to change the sound profile between 3 modes, using different firmwares.
- Low weight.
- MQA X8, TIDAL Masters/HiBy Music/Apple Music compatibility.
- Technical specifications and remarkable measurements.
Cons: It does not come with a case for storage and protection.
- The 3.5mm audio jack is not gold-plated.

Hidizs continues to renew and add new devices to its catalogue. Continuing with the DAC/AMP, this time it is a small USB device with 3.5mm audio output. It is made up of a round, metallic tablet containing the audio output, an LED in its centre and a short cable with the USB Type-C connector. It is equipped with a power-efficient ESS ES9281C PRO chip that supports up to 32Bit/384kHz, DSD up to 128 and MQA X8. It is compatible with Windows, Mac OS, iPad OS, Android, iOS, even newer systems. With the S3 Pro it will be possible to fully experience TIDAL Masters, HiBy Music and even the newly released Apple Spatial Audio. It supports headphones with cable and microphone control. Of course, it is Hi-RES certified and weighs approximately 6g. We will now proceed to discuss the rest of the features and virtues.

Hidizs S3 Pro 01_r.jpgHidizs S3 Pro 02_r.jpg


Hidizs, offered me this model, in exchange for writing an honest review. I want to make it clear that all my opinions written in this review have not been conditioned by this fact, nor will I ever write anything that I do not really think or feel here. I will only write about my personal opinion in relation to the revised product.


  • Dimensions: 20x10x90mm.
  • Weight: about 6g.
  • MQA support: x8.
  • Sample rate indicator light.
  • DAC chip: ESS ES9281C PRO.
  • Sampling rate: up to 32Bit/384kHz.
  • DSD support: up to 128.
  • Headphone output: Single-Ended 3.5mm.
  • Total Harmonic Distortion + Noise: 0.0008%.
  • Signal to Noise Ratio: 117dB.
  • Channel Separation: 70dB.
  • Frequency response: 20Hz-40kHz (±0.1dB).
  • Output power: LR 55mW@32Ω.
  • Power connector: USB Type-C.
  • Supports Windows, Mac OS, iPad OS, Android, iOS or newer systems.

Hidizs S3 Pro 03_r.jpgHidizs S3 Pro 04_r.jpg


The Hidizs S3 Pro comes in a small black box, dimensions 76.5x75x39.5mm. On the front side are some of its features and a realistic photo in its centre. On the back are its complete specifications, in silver lettering. After removing the cardboard sleeve, a black hard plastic box appears, with the Hidizs logo on its lid. Lift it off and the dongle appears encased in a thick black foam mould, protected by a piece of bubble wrap.

The content is as follows:

  • 1 Hidizs S3 Pro.
  • 1 USB-A adapter.
  • 1 Warranty card.
  • 1 User manual.

The packaging is small and fair, as are the contents. Nor is anything else necessary, as these products do not usually have protective cases or boxes.

Hidizs S3 Pro 05_r.jpgHidizs S3 Pro 06_r.jpg

Construction and Design

The Hidizs S3 Pro is a small, cylindrical, metallic, silver-coloured piece. Its diameter is approximately 21mm and its thickness is 9.7mm. The weight is 6 grams. Its faces are like discs, with concentric grooves. In the centre of one side it says "MQA", plus its logo and on the other side it says "Hidizs S3Pro", all in white letters. On this side, right in the centre, is an LED, the colour of which indicates the sample rate and the type of file being played. On the edge is the 3.5mm SE audio socket, which is made of black plastic. On the other side is the cable output. It is a mixed cable with 4 coiled strands, two of them are made of high purity silver and the other two are made of bright OFC copper. Each strand has 60 wires. The total length of the cable is approximately 47mm, including the sleeves that protect the joints. Finally, there is the USB Type-C connector, whose total length is about 20mm. It comes in a silver sleeve with the brand's logo. As a complement, there is also a USB Type-C to USB-A adapter, whose total length is about 22mm.
Internally, it has 4 Panasonic capacitors.
The design is simple, but curious, elegant and small. Both the cable and the connectors are quality, lightweight, despite being metallic. The USB adapter matches the quality, colour and size, as does the cable. The only negative point is that the 3.5mm female connector is not gold plated.

Hidizs S3 Pro 07_r.jpgHidizs S3 Pro 08_r.jpg


The S3 PRO is compatible with Mac OS, iPad OS, Android, iOS or newer systems. It does not come with a Lightning OTG cable, which must be purchased separately. For Windows 10, it is compatible without the need to install additional drivers. It is also compatible with DAPS that support this type of Dongles.
Finally, it is compatible with TIDAL Masters/HiBy Music/Apple Music.

Hidizs S3 Pro 09_r.jpgHidizs S3 Pro 10_r.jpg


The operation is the usual for this type of device, connect, detect and run. In Windows, when it starts playing, it works with a very fast fade.
The existing LED indicates the sample rate, as follows:

  • Red: 44.1-48kHz
  • Blue: 88.2-384kHz
  • Pink: MQA

As this model has a USB Type-C cable, it can be connected to any device with this connection. In case you need to connect to a traditional USB, you can use the additional USB-A adapter, which comes as an add-on.
Supports headphones with microphone and control. No need to remove it from the smartphone to answer the phone.
3 different types of firmwares can be used, which allow the sound to be modified (according to specifications):

1- Transparent, bright, clean, crisp and detailed treble.
2- Tonal balance with a pure and pleasant sound.
3- More prominent bass with incredible elasticity and phenomenal depth.

Default firmware is firmware 2.
The S3 Pro is Hi-Res Audio Certified.

Hidizs S3 Pro 11_r.jpgHidizs S3 Pro 12_r.jpg


As usual with Hidizs, their measurements are usually exemplary. As can be seen, the output impedance is very low (less than 1 Ω), as the maximum voltage is almost the same with no load as it is for 33 Ω or 100 Ω.

No load

Maximum no-load voltage exceeds 1.4V, with excellent linearity.

Hidizs S3 Pro No Load.jpg

15 Ω

The maximum voltage, without visible distortion, is about 1V, respecting the high linearity. This is just over 66mW. This value is surprising for the size level of the device.

Hidizs S3 Pro 015.jpg

33 Ω

As usual, Hidizs is very cautious in its power measurements. According to mine, the S3 Pro can be used at almost full power without visible distortion, with an impedance of 33Ω. The voltage obtained is almost the same as without load, over 1.4V. That provides more than 59mW. The specifications are 55mW at 32Ω, so it is sure to be met and, in addition, it is sure to offer very low distortion.

Hidizs S3 Pro 033.jpg

100 Ω

With this load connected, the maximum voltage of over 1.4V can be assumed. The result is a power of almost 20mW.

Hidizs S3 Pro 100.jpg

Frequency Response

The frequency response is flat throughout its range (10Hz - 40kHz). The drop at the 40kHz end of the range is very slight, practically negligible. Linearity is observed to be maintained at all volumes and there are no differences in power or linearity between the channels. It can be seen how each channel overlaps, forming a single frequency response line.

Hidizs S3 Pro.png


With the default firmware, the tuning is the previously numbered 2. I feel that the profile is balanced, the frequency response is flat and I don't notice any preference towards any band.
Although to say that the sound is mature does not bring much clarity or descriptive ability, I think it is true. Going into detail, this maturity is reflected in all the bands, as they are always within a tonal coherence. There is no hint of peaks or mismatches, just a respect for fidelity, within contained parameters. Let no one expect to find an exuberant sound, completely diaphanous, extensive and open. Nor is it a sparse, narrow, poor or bland representation. The sound of the S3 Pro is serious and convincing, even tenacious. From its power, it is able to handle all kinds of IEMS in an exemplary manner, also thanks to its low output impedance.
Going into more detail and starting, as usual, with the low end, the S3 Pro has a remarkable body in this range, a noticeable sense of punch that brings power to the sound and a more than good resolution. The level of definition is also evident, resulting in a powerful area, with a good sense of clarity, cleanliness and depth. Perhaps it suffers from a greater sensory perception in the sub-bass area, being more evident in the mid-bass, with the consequent (very slight) loss of linearity and realism. All this, when compared to higher priced dongles and from a more perceptual rather than frequency response based point of view.

The representation of the mid-range persists in the idea of tonal balance. In this sense, the timbre comes across as realistic, natural and not at all forced. While the sound is not brilliant with this firmware, the warmth is not representative either, although it does appear slightly. It is worth noting that the level of clarity and separation, which is very important in this range, remains, if not increases. In this way, the distinction between elements, voices and instruments is clear, creating a respectful communion between them all. There are no predominant voices, no prominent instruments, but only what the music decides, or the connected earphones favour. The profile is neither analytical, nor completely silky. It is not a fully profiled sound or one of extreme resolution. It's a good middle ground, gentle, enjoying a little softness and a little definition, but not predominantly. So, without realising it and going back to the description of the sound profile (by Hidizs), the words of tonal balance, purity and pleasant feeling are highly eloquent and accurate. And this is something that in the mid-range is manifestly very clear. And I would not like to forget an eminent sense of musicality in the middle section.
Coming to the high end, the treble is pleasant and natural in its representation. There are no jolts, peaks or exceptions that upset the balance of the sound. Their level of definition veers to the fair but attractive side, with a tendency towards smoothness rather than crispness or brightness. The clarity is diaphanous and the level of resolution quite adequate, to maintain a sound with transparency, openness and air.
The scene has an eminently wide representation, with good depth and average height. The level of three-dimensionality is not very remarkable, although the sound escapes a flat or lifeless feeling, it is certainly more than that. Still, the level of detail is in keeping with the product. Hidden nuances and micro details are perceived as somewhat distant, slightly buried. It is not a revelatory sound, perhaps more because of the smoothness of the profile and its level of cohesion. In this sense, the separation, although quite good, doesn't quite reach a complete dark background, giving the sound a higher transparency than it has. In fact, the S3 Pro is quite honest in this respect and still good enough to be very satisfied with it.

Hidizs S3 Pro 13_r.jpgHidizs S3 Pro 14_r.jpg


The new Hidizs S3 Pro is one of the smallest and lightest devices, which supports MQA X8. It is also very powerful, has low power consumption and is future-proof, as it is highly compatible with a multitude of systems. Its price is reasonable and its measures, as usual with Hidizs, are very good. In addition, its sound is remarkable and can be changed to taste, as, depending on the firmware installed, the profile can vary between 3 modes. It is extremely difficult to find all these virtues in a device like this and at this price, that is why its quality/price ratio is great. Can anyone give more?

Hidizs S3 Pro 15_r.jpgHidizs S3 Pro 16_r.jpg

Earphones and Sources Used During Analysis

  • HiBy R3 Pro
  • Xiaomi Redmi Note 8 Pro
  • NiceHCK Lofty
  • Rose QT9 MKII
  • Hidizs MS2
  • ISN H40
  • NS Audio NS5 MKII Extra Bass
  • Ikko OH10
  • Reecho SG-03
  • Shozy Neo BG
  • Smabat M0
  • NiceHCK EBX21
  • Takstar Pro 80

Hidizs S3 Pro 17_r.jpg


  • Construction and Design: 85
  • Packaging and Accessories: 70
  • Connectivity: 80
  • Operability: 75
  • Sound: 87
  • Quality/Price: 95

Hidizs S3 Pro 18_r.jpg

You can read the full review in Spanish here:

Hidizs S3 Pro 19_r.jpg
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