Thieaudio Oracle MKIII
2x DD, 2x BA, 2x EST
RRP: $589
Introduction
Thieaudio are a brand I’ve been well aware of for quite a while, they have a loyal fanbase and highly regarded in the community. I’ve been curious on and off about various releases, but for some reason never actually took the plunge – I had tried a couple of sets at various meet ups over the last few years, but only ever a fleeting listen and not enough to make a reliable judgement. The recent launch and subsequent very high praise for Valhalla grabbed my attention, in part as I’m quite partial to an all BA set, and I’m an absolute sucker for titanium! As it happens, Linsoul reached out recently and invited me to review the Oracle MKIII which felt like a good opportunity to properly assess my first Thieaudio.
I would like to thank Lili from Linsoul for the opportunity, and note of course that all thoughts expressed are mine with no influence or indeed payment from the brand!
Oracle MKIII is available directly from Thieaudio
HERE or Linsoul
HERE
About Me
I worked in the consumer electronics industry for a large part of my career and have been passionate about music and technology for as long as I can remember. Even as a small child, I would ask my mum to put records on the turntable (Abba, Supertramp, and Planxty if anyone is curious).
My music preferences are very varied—anything from classical to techno, indie rock to jazz, and everything in between. In my early teens, I was a big fan of bands like The Cure and The Smiths (still am all these years later). I was bitten by the dance music bug in the early 90s, becoming passionate about genres like techno, house, trance, and IDM. I amassed a huge collection of records and CDs, DJing at various parties and occasional pirate radio station slots. Although it remained a hobby, I still own thousands of records, and my trusty Technics 1210 turntables are still going strong 30 years later—a testament to Japanese engineering!
I am not a professional reviewer, just an enthusiast who loves music and the devices we use to listen to it. Over the last few years, I have become obsessed with IEMs and related gear. I've bought and sold many, and kept a select few—ranging from the $20 Moondrop Chu to kilobuck sets like the Aroma Jewel, Oriolus' infamous 'Traillii,' UM Mentor, and various beloved single DDs. Through this exploration, I like to share my thoughts with the Head-Fi community, hoping they might be useful to others. However, remember that this is a highly subjective hobby, and your mileage may vary.
While I've been fortunate to own and try a variety of the TOTL sets on the market, I honestly enjoy lower-priced sets as much - especially as the gap continues to close, many much cheaper sets now offering significant value and further driving diminishing returns.
I’ll admit I do suffer from
happy ears—rarely do I find an IEM that I genuinely dislike. At this stage, there are very few truly "bad" IEMs; it all comes down to individual preferences. Since I listen to such a wide variety of genres, I almost always find synergy with some part of my library. Where I tend to deduct marks is in areas like value for money, poor accessories, or an uncomfortable fit—things that can detract from the overall experience.
About Thieaudio
From a nameless group of DIY enthusiasts to one of the best acclaimed IEM brands in the world, THIEAUDIO has made an incredible journey in the pursuit of high-fidelity audio. THIEAUDIO has become a staple brand in audiophile communities around the world, beloved for its best-in-class tunings, superb technical performances, and budget-friendly pricing. From the start, the THIEAUDIO team has put audio quality at the forefront of each project, aiming to be the Robin Hood of the audio world by bringing the best sounding audio solutions at the most affordable prices. Since its launch in 2019, THIEAUDIO’s legacy of in-ear monitors has forever changed the world of IEM’s, influencing how global manufacturers of earphones engineer their products. THIEAUDIO’s international team of few, but dedicated engineers from China and South Korea are committed to continuing this legacy by creating innovative, yet affordable, audio solutions that will leave you in awe.
Specifications:
- Frequency Response: 20Hz - 44kHz
- Sensitivity: 99dB (±1dB) @1kHz
- Crossover: Four-Way
- Driver: Two Ultra-High Frequency Drivers, One High Frequency Driver, One Mid Frequency Driver, Two Low Frequency Drivers
- Cable Connectors: 2-pin 0.78mm
- Cable Termination: Modular Termination with 2.5mm, 3.5mm, 4.4mm Interchangeable plugs
Unboxing
The Oracle MKIII arrives in a nice branded box – I like to see key details on the outside such as the drivers marked clearly on the front, plus good to see a VGP Award too.
When the outer sleeve is removed, there is a plain back interior that opens out and you are quickly greeted with the contents.
Nothing fancy or elaborate in terms of the unboxing experience, but still feels of decent quality. The box is probably a touch large considering the size and amount of contents, they could probably reduce this down somewhat and improve carbon footprint.
Accessories
First off, I’m delighted to see a cleaning cloth included – not enough brands do this in my experience, and I always love to have a cloth nearby to keep the shells nice and shiny, or give the screen of my DAP a quick clean – as noted in previous reviews, I am a bit OCD in this regard so a supplied cloth is always welcomed, one can never have too many…
Aside from that incredibly important cloth, you get a selection of silicon tips in S/M/L, and a set of foam again in S/M/L. I’ve seen much better selections with other sets at this level but to be fair, how many actually use the included tips?
The case is quite big, and certainly too large for the average pocket. I’m not sure why brands make cases this large as you can’t fit anything else other than spare tips and a cleaning cloth… I did try to squeeze in my Hiby R3 MKII but couldn’t quite get it to close along with Oracle MKIII – a shame as that would have been handy for the office etc.
Cable
The cable has a bit of weight to it and finished with a nice relatively soft rubber texture. It has what I would consider a ‘normal’ level of microphonics – nothing excessive, I’ve gone on many walks over the last couple of weeks with Oracle MKIII and wasn’t bothered by cable feedback.
The modular system is very straightforward and while it doesn’t have a locking mechanism, the connection is very sturdy and I haven’t had an unintended disconnections. Along with the standard 3.5mm and 4.4mm, you also get a 2.5mm which is interesting to see.
The cable terminates to 2-pin.
Design and Fit
The shells are reasonably large and I imagine made from a resin, probably 3D printed, I can’t see any reference to this in the specifications. They are relatively light and feature smooth edges that sit very comfortably in my ears.
There is a slight recess to receive the 2-pin connectors, something I always hope to see and find many brands neglect, instead having a flat 2-pin socket… so bravo to Thieaudio to this small but important aspect! Along with the included cloth, we are on a roll…
There is of course a vent on the shells which means no dreaded pressure build.
Listening Impressions
Its funny the various first impressions that can occur when you plug in a new set for the first time – that moment where you ponder what track to choose first, and indeed what source if like many of us in the hobby, there are a few options to reach for. It can be anything from ‘hmm’ to ‘very nice’, to ‘wow’ – the ‘hmm’ isn’t always a bad sign, it can be simply that my head hasn’t quite deciphered what I do or don’t like, or maybe a bit of brain-burn needed having come from a very different set. Anyway, in the case of Oracle MKIII, it was clearly a ‘very nice’ – this is a set that I found immediately engaging and captivating, featuring a smooth and natural sound with a nice touch of warmth. I’ve worked my way through countless ‘shelves’ of my library over the last few weeks and there has been excellent synergy with any genre I try.
The driver configuration in Oracle MKIII has become a very popular mix, albeit in various different counts of each driver. In this case, we have 2x DDs, 2x BAs, and 2x EST.
Low Frequency
Thieaudio describe the implementation of their ‘IMPACT2’ subwoofer system via the two dynamic drivers, leveraging an isobaric design which enhances sub-bass performance with improved efficiency, while reducing any distortion. I’m a sub-bass guy, not that I don’t appreciate a nice mid-bass slam, but when choosing one or the other, I will mostly choose a deep sub-bass rumble… and surprise surprise, that is exactly what is delivered here… BUT, you do also get an excellent amount of mid-bass too – I have found this is often the case with 2x DD implementations, allowing both areas to really shine. The combination of both certainly inject the overall tuning with a sense of warmth and weight, but yet not to the detriment of speed and clarity. While maybe not at bass-head levels for the most die-hard of this bunch, I would be surprised if most aren’t more than satisfied here.
Midrange
Thieaudio mention how they retain the monitor style tuning here, with an emphasis on neutral mids that deliver a clear and detailed presentation – again, probably a tuning preference for me for the most part, especially in a set that sits more as an all-rounder. As noted, the bass does set a foundation of warmth in the overall tuning, yet the mids still maintain a mostly neutral profile with excellent levels of detail and imaging. Upper mids stay within a very safe zone, I can’t see this region being a problem for anyone. Listening to ‘Orlando in Love’ by Japanese Breakfast, a track that features on their latest album, and I find the vocals are sat perfectly central, maybe slightly forward but not obviously so – there is a good sense of weight and realism.
High Frequency
I’ve read comments that the MKII iteration of Oracle could get a bit spicy in this region, and it became an area for Thieaudio to address in the MKIII. I’m not particularly treble sensitive, and can’t comment on the MKII having not heard them, but certainly no issues for me over the last few weeks with MKIII – I haven’t had a single moment with any track, from any genre where I picked up anything remotely harsh or shrill. There is excellent extension in this region, with a nice sparkle and captivating sense of stage dispersion. There is certainly a treble focus, in a similar way to the low frequencies, giving an overall somewhat u-shaped signature to the overall tuning. As always though, this can be an area of risk for some and many factors ultimately dictate the outcome – source, choice of music, tips, ear anatomy, age… etc!
Technical
I wouldn’t consider Oracle MKIII to be a set that focuses on technical precision, overall I find the emphasis to be on musical engagement. That said, certainly no slouch either, offering an impressively wide stage, excellent imaging with clear instrument placement and detail. The overall presentation has a excellent sense of coherency, with nothing sounding out of place. The clarity in the mids also ensures that there is never any congestion or harshness.
Comparison
FIIO FH19 (dual DD, 6x BA - $599)
The FH19 is another excellent set and the most immediate difference I hear when I switch is a more energetic signature, everything feels like it steps forward and even the treble sounds more lively, I think due to the smooth/visceral sensation from the ESTs in the Oracle. The stage feels smaller in FH19, technical performance otherwise quite close, but I’d give the edge to Thieaudio. The mids sound more pronounced on the FH19, I think largely due to more extension in the upper mids which are quite noticeable with female vocals in particular. Broadly, switching between the two sets the most apparent macro difference is a smoother overall profile for Oracle, versus a more energetic and lively or ‘fun’ tuning on the FIIO.
The FH19 shells are slightly smaller and a bit heavier, but I’d say comfort levels overall on par. That said, I do have reasonably large ear canals and can generally tolerate large shells – unless they have longer nozzles, which can be a problem. FH19 comes with a far greater array of accessories, with numerous tips and various other bits and pieces such as cleaning brush, cable clip to name a few – FIIO of course well known for their generous selection of accessories.
DUNU DK3001BD (1x DD, 4x BA, 4x Planar - $499)
This was one of my favourite sets from 2024, and unfortunately been neglected so far in 2025 due to lack of time to revisit sets that aren’t in the review queue.
Similarly to the previous comparison, the first and most obvious difference I note with Braindance is a step up in energy, but in this case also a step up in overall detail – the energy in FH19 goes in a more lively and fun direction, whereas here we switch to more analytical. At first sounding slightly sterile in comparison, but once my brain settles in I can’t help but be wowed all overall again by the technical performance on offer here… and indeed when switching back, Oracle MKIII at first sounds a bit veiled in comparison, the drop in detail precision is immediately obvious, but with a couple of minutes I’m again captivated by the sense of smoothness, cohesiveness and overall musicality.
Again, the range of accessories on offer with the DUNU are on another level - DUNU in the same way as FIIO always known to bundle a huge selection of accessories.
Side note, definitely need to spend time with the Braindance again soon...
Conclusion
My first proper exploration into the world of Thieaudio through the Oracle MKIII has been very rewarding, and certainly highlighted why Thieaudio is such a popular brand in the community. This set captivates with its smooth, cohesive tuning, excellent bass, clear mids, good EST visceral sparkle, and a natural warmth that is equally suited for a wide variety of genres. Combined with thoughtful design elements and impressive comfort, the Oracle MKIII strikes an excellent balance between technical competence and sheer musical enjoyment.
I would like to thank Lili from Linsoul again for the opportunity, delighted to have finally dipped my toe into the world of Thieaudio.
Your analysis aligns with mine, they're a wonderful set.
An ideal all-rounder for all genres.