In-Ear Fidelity

DUNU SA6 Review: Mini-VX

Table of Contents


DUNU is one of the older chifi companies that I know of that managed to survive all the way into the “new world”, refreshing its old “DK” series lineup and further market-shaking releases such as the first (and currently only) pure-Beryllium dome dynamic driver IEM, the Luna.

I still have fond memories of the original DUNU Trident DN-12, one of my first encounters with the chifi hype train that I was also personally a part of. Of course, nearly ten years later I’ve since learnt a lot and changed my ways, but it’s still a nice memory to go back to knowing that at some point I, too, was once a bright-eyed, enthusiastic novice seeing the good in every set of headphones I listened to rather than the pedantic, jaded veteran that I am today.

The SA6 is DUNU’s first breakaway from their DD roots, being their first pure-BA IEM. A pure-BA from a company that typically deals with hybrids and single DDs? The IEM community is a skeptical bunch, so naturally many are cautious towards it. But DUNU is no newbie to the IEM world; in fact, they’re one of the oldest brands still alive and kicking today.

So now I guess the question IEF needs to answer: how good is the SA6 actually?

Product page:

MSRP: $550

Driver configuration: 6BA

This SA6 was kindly provided by DUNU.

Signature & Tonality

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Comparison courtesy of the Graph Comparison Tool

The signature of the SA6 can be described as “neutral with bass boost”, though others may consider it mildly V-shaped (or even mildly U-shaped).

Turning on the “Atmospheric Immersion mode” switch (which is really just a bass boost switch once you look past the marketingspeak) increases the bass slightly by about 2dB. I personally prefer the SA6 on the default setting, but the option to get some extra punch and rumble is appreciated.

The overall tonality is good; excellent, in fact. The bass emphasis is controlled well, with no bloat or bleed no matter how hard one tries to push it. The midrange is generally capable being balanced and tilting towardness a smoother, less edgy presentation, though I can see some taking issue with the 4.5kHz point which would be exacerbated by a relative dip in the 3-4kHz and 6kHz regions. The treble has sparkle without fatigue, though unfortunately lacking in upwards extension and can cause percussive instruments to struggle when it comes to clarity and air.

It’s not hard to determine why the SA6’s tonality is so solid, especially when one can see that DUNU probably has taken some inspiration from the critically acclaimed qdc flagships:

The SA6 shares many subjective similarities to the (very much more expensive) qdc IEMs, for instance the forward vocals, the pulled-back lower mids, and not to mention the “signature” mid-treble sparkle tuned in by the relative dip in 6kHz right beforehand. The latter of which does help in allowing for emphasised treble without harshness, though comes at the cost of slightly compromised instrumental timbre.

So for those asking for the mythical “mini-VX”, the SA6 would be the closest one can get especially at the sub-kilobuck budget. Obviously it’s not identical; the midrange is a little more uneven on the SA6 and the treble extension leaves a little to be desired, but for the most part the general flavour is there.

A strong showing by DUNU on the tonal front. Not often do you get IEMs tuned this well, much less for ~$500.

Tone grade: S-

For more information on the grading system, click here


It’s hard to really write about the SA6’s technicalities since it can be described as simply “very good”. I don’t think any one aspect is lacking at all, be it the resolution, the note definition, or the imaging capabilities. Even timbral performance gets a pass here considering that the SA6 has surprisingly low BA timbre, I’d daresay even less than the aforementioned similar qdc offerings.

Though, yes, the caveat is that the SA6 is still a way’s away from true “top tier” material. It still isn’t as resolving as the qdc TOTLs, there are still instances where the notes stumble into one another, and of course the imaging chops are (as with many others) just average. The SA6 aims high, and while it doesn’t quite reach the moon, suffice to say that it’s comfortably in the stars.

Technical grade: A-

For more information on the grading system, click here


$550 is kind of an untouched market considering that most consumer tend to see the market as “sub-$100”, “sub-$500”, “sub-$1000” and “kilobuck”. Entrants in this bracket are relatively few and the competition sparse, but it’s a double-edged sword considering that they then have to compete with IEMs outside their price brackets.

Within this price bracket at least, the main competition seem to be these:

  • Fearless S8 series
  • iBasso IT04
  • Sony IER-M7
  • ThieAudio Legacy 9

Which is a strong lineup, especially with the Sony and the Fearless. But of course, that’s selectively discounting the other IEMs in the price bracket that are noticeably worse off (the Shure SE535 and the Astrotec Delphinus 5 come to mind), not to mention the ones far more expensive yet don’t have the performance to justify their price tag.

Looking at it from a more abstract standpoint though, the SA6 is one that could give many kilobuck IEMs a run for their money. Not the exceptional kilobuck IEMs of course; nobody’s expecting the SA6 to go toe-to-toe with a U12t. But against something like a Valkyrie? A Roxanne? A Grace? Suddenly the lines get blurred.

Value Rating: ★★

“Redefines the price bracket”
For more information on the grading system, click here


The SA6 takes some inspiration from the qdc flagships, and for good reason. Impeccable tonal balance with a sound that could go all the way, alas bottlenecked by sheer technical performance. But for $550… asking for more would be greedy.

Grade: A ★★

Awarded grades are in reference to the Ranking List.

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Man Ho

6 thoughts on “DUNU SA6 Review: Mini-VX”

  1. “doesn’t quite reach the moon, suffice to say that it’s comfortably in the stars.” But the stars are much further away than the moon, no?

    1. The metaphor I was referring to is “Shoot for the moon. Even if you miss, you’ll land among the stars.” which is attributed to Norman Vincent Peale.

  2. I just got the Dunu SA6, and there’s nothing else I would rather have at this price point, until Dunu or Moondrop come up with a new hybrid that’s better than the previous ones. The only other one I was considering was the Kiwi Ears Orchestra. Shanling ME700 Lites, my previous set, may have had a slight edge in resolution but had far more BA timbre than the SA6. I suspect I would have had the same experience with the Moondrop S8. With the SA6, I can hear BA timbre with certain songs I’m used to hearing on speakers, but not all of them. I think the Sonion woofers they had selected, in carefully designed chambers are the only way to go, for BA bass that’s any good.

    The reviews were all good from Crin and Precog, and the SA6 had gone just like was expected for me.

    I eq up the dip around 5kHz, and have a high shelf at about 9kHz

    Resolution, imaging, and soundstage are as good as I would expect for $550. I suspect the 64 Audio U6T would be a step up, but for more than twice the price. I also have a poor use case as I also have headphones and speakers.

    My other IEM is the Moondrop Kato, and those are good at certain things. Imaging is remarkable for $179 (it’s their stiff DLC driver); even my Focal Clear Mgs don’t outperform those in that area.

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