Review by Yee Wei
General/Packaging/Build
xDuoo has consistently earned my respect in the portable DAC/amp space, and the Link3 is their latest and most ambitious swing yet at the dongle format.
What immediately sets the Link3 apart physically is its size, in between a dongle and transportable? The CNC-machined aluminium alloy chassis with tempered glass front and back and a dark grey anodized finish gives it a distinctive retro, sci-fi, military aesthetic that I genuinely appreciate it doesn't look or feel like every other dongle on the market. One small ergonomic quirk worth flagging: both the USB-C input and the headphone jack sit at a slight angle rather than flush, so the whole cable assembly ends up sitting diagonally rather than cleanly. Not a dealbreaker, but worth knowing if clean cable geometry matters to you.
There is a small TFT colour display, which despite being labelled TFT, has visual quality that feels closer to OLED. You can customise the display colour across seven options and five brightness levels, and a triangular LED indicator provides sample-rate colour coding alongside it. Controls are limited to four buttons, but they're firm, high-quality, and the settings menu is intuitive enough to navigate without cracking open the manual. Non-volatile memory means your settings persist between sessions, which is a small but genuinely appreciated touch.
Packaging is straightforward — a flat grey box with a sliding inner tray, containing the Link3, a short USB-C to USB-C cable, a USB-A to USB-C adapter, and the manual. Nothing extravagant, but everything you need.
Specifications
- DAC: Dual ESS ES9039Q2M
- USB Processor: XMOS XU316 16-Core, UAC 1.0/2.0 compatible (also works with Steam Deck, Switch 2, and older PCs via UAC 1.0)
- Output Power: Up to 700mW BAL normal mode, up to 1000mW BAL with Super Power Mode (external USB-C power)
- PCM Support: Up to 32-bit/768kHz
- DSD Support: Native DSD512
- Display: TFT colour, customisable colour and brightness
- Gain Modes: High/Low
- Digital Filters: 4 FIR settings (Minimum Phase, Linear Phase Fast Roll-off Apodizing, Linear Phase Fast Roll-off, Linear Phase Fast Roll-off Low Ripple)
- EQ Presets: Music, Movie, Games, Off — no custom PEQ or app support
- MicroSD Slot: Up to 2TB, functions as a USB hub for expanded storage — genuinely useful as a workaround for iPhone/iPad's lack of storage expansion
- Phone Charging: Supported during playback, including fast charging via PD 3.0
- Volume Control: 100-step independent digital control
- Weight: ~70g (without cable)
Gears Used for This Review
- EPZ P40
- Tanchjim Origin
- Tanchjim Soda
- Aune S18 Evo DAC + Aune S17 Pro Amp (for A/B comparison)
- Link 3, KA17
- Apple Music, Tidal, foobar2k
- UAC 2.0, High Gain, EQ off, FIR 1 filter
Foreword
My review is solely based on what I hear via my equipment and I never consider my reviews to be objective in any way rather a subjective approach. Do take into consideration that everyone's ear anatomy is not the same, so the psychoacoustics perception might be different as well, but i believe it will not stray too far.
Sound Impression
The Link3's most immediate impression is just how much bass authority it produces for a dongle DAC. This is not the lean, clinical ESS implementation you might expect from a typical dual-DAC dongle. The overall signature is subtly U-shaped, with elevated bass and lower midrange, a relaxed upper midrange, and an energetic upper treble to balance things out. Tonality leans warm and thick, favoring a grounded, analog-leaning character over a razor-sharp analytical one, but this range of impressions is worth keeping in mind, as IEM choice will shift where you land on that spectrum.
Bass
Bass on the Link3 is quite authoritative based on what I've heard from a dongle DAC, full stop.
- The low end has punch and detail without ever sounding loose or overblown
- It's well controlled regardless of the material being played, and never seems to run out of breath even on demanding tracks
- Listening to Slipknot's People = Crap!, the double-kick during the intense opening comes through with real physicality and speed, not merely outlined
- Sub-bass digs deep with satisfying weight — Daft Punk material rumbles with authority that most dongles simply can't match
- The bass doesn't bleed into the mids at all, despite the elevated presence, staying controlled and well-organised
- For those seeking a leaner, more neutral low end, the Link3's warmth may add slightly more body than desired with already-bassy IEMs — worth keeping in mind for pairing choices
Mids
The midrange follows the Link3's fuller, warmer tonal direction.
- Vocals carry good body and weight — Zhao Peng's deep baritone comes through with genuine chesty weight and richness
- Female vocals remain clear without being pushed aggressively forward — Faye Wang sounds smooth and expressive without any glare
- The upper midrange sits slightly relaxed and laid-back rather than forward, which keeps the overall presentation comfortable over long sessions
- Instruments like piano, guitar, and strings benefit from the slightly rounded, dense presentation, sounding musical rather than forensic
- The trade-off is that with already warm-tuned IEMs, the midrange can feel a touch dense and less open than a leaner source would deliver — pairing choice matters here
Treble
Treble on the Link3 is clear, controlled, and genuinely easy to live with over extended sessions.
- There's a notable energy lift in the upper treble that counterbalances the elevated bass, giving the overall presentation good life and sparkle at the very top
- The Link3 avoids the brittle, overly sharp character that some compact ESS-based dongles can exhibit
- Cymbals retain good definition and strings keep their upper harmonics intact without becoming harsh
- This isn't the airiest or most extended-sounding treble in its price bracket, but it's intentional — xDuoo has prioritised long-term listenability over outright brilliance
- Poorly recorded or already-bright tracks benefit from this restrained approach, as the Link3 doesn't exaggerate harshness or sibilance
Soundstage/Imaging
- Soundstage size is above average with good height, width, and depth — not the most expansive I've heard, but never claustrophobic either
- Lateral panning is smooth and convincing, with nice front-to-back layering of vocals and instruments
- Centre imaging is stable and well-defined, particularly through the 4.4mm balanced output
- Imaging and separation are genuinely strong technical points here — multiple reviewers I cross-referenced independently praised the precision and layering, particularly when driving demanding planar loads
- Fine layering isn't quite as sharp or surgically precise as more resolution-focused competitors, and the Link3's fuller tonal balance can make very dense mixes feel slightly more compact
- Dynamics are genuinely excellent for a dongle DAC, this thing has headroom to spare even at high volumes, and doesn't sound current-limited the way many dongles do when pushed
Driveability
The Link3's headline feature is its power delivery — up to 700mW balanced in normal mode, rising to 1000mW with an external USB-C power source. This is enough to comfortably handle full-size dynamic headphones and planar magnetics, putting it well beyond typical dongle territory and into genuinely capable amplifier scaling.
- EPZ P40: Drives with total ease. The added current gives the P40's tribrid architecture a firmer backbone, tightening bass control and giving the BA-driven mids and treble excellent stability
- Tanchjim Origin: A very comfortable, natural pairing — the Origin's inherent warmth combines with the Link3's grounded character for a rich, cohesive listen, though those wanting more air and separation may prefer a leaner source
- Tanchjim Soda: This pairing is genuinely interesting — the Soda's forward, lean upper-mid character is nicely tempered by the Link3's warmth, filling out the lower mids without sacrificing the Soda's excellent imaging
- Aune S18 Evo + S17 Pro Amp (comparison): The Aune chain is noticeably more neutral and transparent by comparison, with better separation and air. The Link3 counters with more bass slam, more density, and a more immersive, muscular presentation. Neither is objectively better — they simply serve different listening priorities as well as budget, and they are on a different class anyway
Even without external power, in-hand current delivery via the balanced output is genuinely impressive, I did not encounter a single IEM in my collection that this couldn't drive with authority and headroom to spare. Full-size headphones like the AR5000MK2 as well as SR7000 are handled with real confidences
A few practical realities are worth setting expectations on. The Link3 runs a little warm during normal use, and noticeably warmer with a MicroSD card inserted or when external power source is connected, to me, i personally use this device most of the time on my desk, so those are not a major issue for me.
Comparison (FiiO KA17)
The FiiO KA17 is the most natural rival at a similar price point, and one that comes up repeatedly when the Link3 is discussed. It represents the more conventional, compact dongle philosophy that the Link3 deliberately breaks away from.
In terms of size and portability, the KA17 is definitely ahead, it's slim, light, and disappears into a pocket the way a proper dongle should. The Link3 asks you to accept significantly more bulk and weight in exchange for its expanded feature set.
Sound-wise, the two take genuinely different philosophies. The KA17 leans cleaner, more neutral, and more software-tunable thanks to its PEQ support, letting you shape the sound to taste. The Link3 counters with its warmer character, superior raw power delivery, and a denser, more physically authoritative low end that the KA17 simply can't match without EQ intervention. If ultimate compactness and flexible software tuning matter most, the KA17 is the easier daily carry. If you want raw power, a genuinely different sonic character, and the novelty of expandable microSD storage, the Link3 is a unique product in my opinion and nothing else currently combines dual flagship-tier DACs, this level of power output, and onboard storage expansion in one unit.
Final Thoughts
The xDuoo Link3 is not trying to be the smallest, cleanest, or most neutral dongle on the market, and it's all the more interesting for it. What it delivers instead is a genuinely powerful, warm, grounded, and engaging listen backed by real current delivery, a useful display, and the novel addition of expandable microSD storage. The bass authority alone is enough to make this stand out in a crowded field of clinical, thin-sounding competitors, and the gaming console compatibility and pass through charging support add genuine everyday utility on top.
It's not without trade offs though, the size and the lack of PEQ, and the deliberately non-analytical tuning won't suit everyone, and this is better thought of as transportable rather than truly pocket-portable. But for those who want a dongle that behaves more like a proper portable amplifier, with genuine drive and a musical, forgiving character, the Link3 makes a very compelling case at $219.
