Portable Class A AMP/DAC with unique twist - XDuoo Link 3 review

ducurguz
3 days ago
7 min read

https://www.youtube.com/watch?v=y6_rf6oP6Vc

Link 3`s beautiful promise

What if your dongle DAC could also store your entire music library and drive your hardest-to-power headphones — all from your phone? That's exactly what xDuoo is going for with the Link3. And honestly? It's one of the most ambitious — and most divisive — dongles I've come across in a while.

I'm HIFI Daydreaming and welcome back. Today we're looking at the xDuoo Link3, priced at $219. It's big, it's powerful, and it's got a trick up its sleeve that no other dongle on the market has right now. Let's break it all down.

Size, Weight, Specs and Build Quality

First things first — let's talk about the elephant in the room. This thing is large. We're not talking "slightly chunkier than your average dongle" large. This is the biggest dongle I've personally handled, coming in at around 70 grams on its own, closer to 75 with the cable attached. For context, most dongles sit in the 10–20 gram range. This is nearly triple that.

The build itself is solid — aluminum chassis, a proper color TFT display on the front showing your current format, gain setting, and volume. There's a multi-color LED that shifts based on bitrate, so you can see at a glance whether you're playing standard PCM, hi-res, or DSD without digging through menus. Physical volume buttons, a play/pause button, a function key, and a gain switc Inside, xDuoo went with a dual ES9039Q2M DAC setup — two flagship-tier ESS Sabre chips — paired with the XMOS XU316 16-core USB processor. That gets you full 32-bit/768kHz PCM and native DSD512 decoding, with a rated 130dB dynamic range and distortion figures that sit around -120dB THD+N. These are desktop-class numbers in a pocket device.

Blue geometric USB device labeled "Link3" on brown surface, sunlight casting shadows.

Story of Portable Class A Amp

But the real story is the amplifier. The Link3 uses Class A amplification — which is genuinely rare in a dongle. Class A runs hotter and drains more battery than Class AB, but what you get in return is a specific character to the sound that we'll talk about in a moment. In normal mode you're looking at 700mW into 32 ohms. Plug a power bank into the second USB-C port and that jumps to 1000mW. That's enough to drive full-size dynamics and planar magnetics comfortably — we're talking HD600-level loads, no problem.

Story of Portable Storage with DAC

And then there's the microSD slot — up to 2TB — which mounts as external storage on whatever device you're connected to. For iPhone and iPad users especially, this is a genuinely compelling feature. No native storage expansion on Apple devices means this Link3 effectively gives you a portable music library you can plug straight in and play from any apps you like. It's a lot of hardware packed in. And like this amazed me to no end. you can use this as proxy DAP, like no tour phone easyly plays DSD and you have all this great and extra 24 bit big files that you can play via this dac. it is ana amazing feature like, which i loved to no end. it id almost worth it just for that to carry it in your pocket, despite some of its flaws.

One thing worth mentioning — the USB-C cable plugs in at a slight angle, and so does the headphone jack. So the whole assembly sits at a slight diagonal rather than flush. Not a dealbreaker, but if clean cable geometry matters to you, it's worth knowing.

Two outputs: 3.5mm single-ended and 4.4mm balanced. And two USB-C ports — one for your phone, one for external power. More on that in a second.

Smartphone on brown surface showing Pink Floyd's "The Great Gig in the Sky" album cover. Connected to DAC via braided cable.

Sound Quality

Here's where it gets interesting — and a bit polarizing.

The dual ES9039Q2M chips are known for a clean, technical, highly resolving presentation. And yes, that resolution is absolutely here. Imaging is precise, layering is excellent, the background is very quiet. Drive a demanding planar magnetic off this thing and the separation and control are immediately noticeable compared to a weaker source.

But here's what caught me off guard: this does not sound like a typical ESS Sabre dongle. ESS chips are usually associated with a neutral, sometimes slightly analytical character. The Link3 throws that expectation out the window. The Class A amplifier stage adds real warmth and density — the low end is thick and full, the midrange has body and weight, and there's an organic, almost analog quality to the presentation that I wasn't expecting from an ESS-based device.

For rock, metal, and electronic music — this thing genuinely shines. The bass has texture and impact, the mids feel present and full, and there's real excitement in the way it handles dynamic music. It doesn't fatigue; it just draws you in.

Where it becomes more of a compromise is with music that demands precision and neutrality — classical, acoustic, well-recorded jazz. The low-frequency emphasis starts to feel like colouration rather than enhancement in those contexts. Instruments that should feel airy and transparent take on more weight than is strictly accurate. It's not unpleasant, but it's not neutral.

So the honest summary is: this is a dongle for people who love a warm, dense, bass-forward signature. If you EQ everything and want a flat reference starting point, look elsewhere. But if you like your music to sound big and full and alive — especially through IEMs or planars that benefit from that low-end energy — the Link3 is surprisingly gratifying.

A turquoise electronic device with a display showing "352.8 kHz PCM" lies on a tan surface, connected by a braided copper cable.

Some Problems

There are a few practical things you need to know before buying this.

Battery drain is significant. Class A amplification is power-hungry by nature, and real-world testing puts continuous runtime at around 4 hours from a full charge on a typical phone. That's not great if you're out for a full day without a power bank. which is again a big minis for me. you definitely really feel the drain, and it is fast, really fast, that class a is no joke for power drain.

It also runs warm — seriously warm. this has always been a huge problem of class a amps. but usually i so not carry my class a amp while i listen outside.

This got seriously warm at prolonged listen. And you have to hold it in hands, or in pockets, it can get uncomfortable. This is a problem for me almost, a big one. But depending on you and your tolerances could be more or less.

Link 3 vs Competition

Lets be serious about competition there are a lot of great Dongles in this price range, fiio ka17, qx13, ifi go link, ibasso dc4 and DC4 pro.

Some competition is more detailed, more transparent more dense. but none of them have this great amazing warm encompassing beautiful sound of class a. You will not find any of that in any other dac/amps.

What no one else has is that combination of Class A amplification, flagship dual-DAC decoding, and onboard storage expansion in a single unit. That's a genuinely unique package, even if it comes at the cost of size and battery life.

Electronics on a tan surface: teal USB cable, illustrated metal case, black adapter, and teal device labeled LNK3 with circuit design.

Conclusion

All of which is to say: this is probably better described as a transportable device than a truly portable one. It's excellent at a desk, great at a coffee shop with your phone on the table. Dangling from your pocket while you walk around town? That's a commitment. and its size well just to say it is too big for some of my pants pockets. generally it is much biger than my other dongles. much bigger.

The xDuoo Link3 is not for everyone — and it doesn't try to be.

If you want something compact and neutral, look at the iBasso DC4 Pro or the FiiO KA17. If you want Bluetooth and a companion app, the Qudelix 5K is still the value king. But if you want to drive demanding headphones with real authority, you love a warm and musical sound signature, and the idea of having 2TB of music accessible through your iPhone actually solves a real problem for you — the Link3 is genuinely hard to beat.

It's big, it runs warm, and it will eat your phone's battery. But it sounds wonderful for the right kind of listener, and it does things nothing else in this category does.

That's the xDuoo Link3. Links down below if you want to grab one. Drop a comment letting me know what you're pairing it with — especially curious if anyone's running planars off this thing.

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