Thieaudio Monarch MK3 default shell front over white background
Thieaudio Monarch MK3 default shell front 3 quarter and rear over white background
Thieaudio Monarch MK3 default shell front closeup on accessory case from Bloom Audio gallery
Thieaudio Monarch MK3 Sunset Horizon finish front over white background
Thieaudio Monarch MK3 Sunset Horizon finish front with stock cable over white background
Thieaudio Monarch MK3 Butterfly finish front over white background
Thieaudio Monarch MK3 Butterfly finish front with stock cable over white background
Thieaudio Monarch MK3 Disco finish front over white background
Thieaudio Monarch MK3 Disco finish front with stock cable over white background
Thieaudio Monarch MK3 Aurora Mix finish over white background
Thieaudio Monarch MK3 Aurora Mix finish with stock cable over white background
Thieaudio Monarch MK3 Aurora Crystal finish front over white background
Thieaudio Monarch MK3 Aurora Crystal finish front with stock cable over white background
ThieAudio Monarch MK3 Aurora Pink B2
ThieAudio Monarch MK3 Aurora Blue B3
ThieAudio Monarch MK3 Black Widow C2
ThieAudio Monarch MK3 Green Glamour C3
ThieAudio Monarch MK3 Blue Buoyant C4
ThieAudio Monarch MK3 Red Romance C5
ThieAudio Monarch MK3 Deep Dungeons D1
ThieAudio Monarch MK3 Sea Vines D2
ThieAudio Monarch MK3 Red Vivid D3
ThieAudio Monarch MK3 Green Urchin D4
Thieaudio Monarch MK3 all available shell colors and finishes chart

Thieaudio Monarch MKIII | Flagship Tribrid Universal IEMs

Regular price$999.00
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Style
Faceplate

Thieaudio new black logo

A Brilliantly Re-engineered Threequel: ThieAudio Enhances Their Tribrid Legend with the Monarch MKIII

  • 2 Dynamic drivers, 6 Balanced Armatures, and 2 Electrostatic drivers
  • Enhanced Ultra-treble Output: now features Sonion's EST drivers and increased frequencies for improved staging and resolution
  • Improved Bass Quality: enjoy better quality bass without sacrificing tonal integrity with ThieAudio's IMPACT2 subwoofer innovation
  • Upgraded thicker 22AWG stock cable with modular plug design including 2.5mm, 3.5mm, and 4.4mm smart-switch plugs
  • (x6) shell colors with (x15) faceplate styles now available for a customizable finish
  • Check out our measurement of Monarch MKIII
  • Read our 2025 Thieaudio Buyer's Guide!


Bloom's Take

With the Monarch MK2, ThieAudio captured the highly resolving nature and micro-detail presentation of a flagship experience and delivered them with impressive value for the money. It was easily a best-seller IEM, earned a seat at the table of Bloom Audio's "Best Bang for your Buck" IEMs, and was rated as one of the best IEMs in the world by a number of reviewers and critics.

These are extremely big shoes to fill... but ThieAudio may have done just that with the Monarch MK3.

The MK3 successfully maintains a core tuning balance and delivers an elevated level of technical performance with excellent bass extension, natural and lifelike mids, and improved treble that provides sparkle and shimmer without sibilance and stabbing. Additionally, the imaging and soundstage are a clear standout.

The packaging and accessory kit for the MK3 remains essentially the same and is largely shared across ThieAudio’s lineup. However, the stock cable has changed and is more akin to the Oracle MKII cable. And while the new default faceplate is gorgeous, one of the big draws of the MK3 is the range of customizations available with the shells and faceplates offering about 80 possible combinations making this a special IEM.

Whether or not you love the changes from the MK2, the price, performance, and design make a really compelling case for Monarch MK3 as a near-flagship quality $1000 IEM that approaches "bass-head" territory.

Read our full review here.


ThieAudio Monarch MK2 and MK3 side-by-side with stock cables on wood tray from Bloom Audio gallery

IMPACT2

IMPACT2 (“Impact Squared”) is ThieAudio's latest technological innovation to change the personalized audio industry. IMPACT2 is a new subwoofer solution consisting of (x2) 10mm composite diaphragm drivers arranged in an isobaric design. The addition of another 10mm subwoofer significantly enhances the power and texture of the bass, while the in-house isobaric chamber design keeps the frequency and pressure constant. This means you can enjoy better quality bass without sacrificing tonal integrity.

Enhanced Ultra-Treble Output

The Monarch MKIII has been updated with Sonion’s latest EST drivers and re-tuned to better exhibit their full potentials. Thanks to the new tuning strategy, the ultra-treble frequencies at +15kHz to 20kHz have been increased for a more comprehensive upper frequency extension. Compared to its predecessor, the Monarch MKIII will have a greater sense of staging, atmosphere, and an overall enhancement in perceived resolution thanks to this extension.

ThieAudio Monarch MK3 frequency response graph with Monarch MK2 comparison

Balanced Tonal Signature

At the core of the MKIII is a commitment to tonal excellence. It retains a studio-monitor like tonal signature with a focused sub-bass impact for a clean, natural, detailed sound. Engineered with a true 4-way crossover with 9 separate passive components, the Monarch MKIII stays true to its tonal legacy. Thanks to IMPACT2 , the subbass is punchier, but the mids from 200Hz to 800Hz retain their ruler-flat neutrality. This tonality of the mids mimics the true sound of studio monitors used in recording studios to deliver accurate audio reproduction.

Furthermore, the MKIII mids have been revamped to better separate respective driver ranges for maximum output while minimizing the THD. This means the mids will sound higher in resolution while retaining the same monitor-esque tonality. The treble has also been slightly re-tuned to offer more coherency throughout the region, as well as little more clarity and definition.

ThieAudio Monarch MK3 with attached stock cable on sea green folding pouch with plant from Bloom Audio gallery

Specifications

Thieaudio Monarch MKIII measurement graph

  • Drivers: Sonion EST, Knowles DWFK 31785 (x2), Sonio 28UAP (x1), IMPACT2 (x2 10mm Composite DD)
  • Crossover: 4-Way Passive with 4 Sound Bores
  • Sensitivity: 99dB @ 1kHz (+/- 1dB)
  • Driver Impedance: 20Ω
  • Frequency Response: 20Hz-40kHz
  • Cable: 4' 22AWG 6N OCC Silver-plated and Graphene Silver-plated
  • Termination: 2-pin 0.78mm with (x3) modular Smart-switch (2.5mm, 3.5mm, 4.4mm)

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Customer Reviews

Based on 27 reviews
85%
(23)
11%
(3)
4%
(1)
0%
(0)
0%
(0)
C
Christofer ochocki
Simply the Goat

So I went a bought $200, $350, $475, $650, $800 in inferior IEMS, I won't mention the names, instead of just going straight for, what bloom called, "the flagship iem", I thought I would just bargain find what I could live with and pretend that they were great. Well that didn't work, and so did 8 months of my time when I could have had the best in the first place. I'm no audio guru or audiophile etc etc, all I can say about the sound and I really mean this,,,, it to me sounds what music is supposed to. I know I sound real smart, but give me a minute to explain, so everything before an IEM would add a little bass, or a little treble, sound hollow, sound too bright, not enough weight, just to me didn't sound relaxing to my ears, and I listen very loudly and I call that relaxing. Everything was just all there and all just rite, not to much of anything and all I can say is, you'll find yourself losing time cause your ears are being made love too, I know weird analogy, but really makes so much sense to me. Sp finally after about a year I can finally stop wasting time and money and just sit back and enjoy pure ear candy, another analogy I know. I love and can say without a doubt I would never cheat on my Theiaudio monarch 3, they take care of my ear like they've never been taken care of before!!! Full of analogies.. I know it's a lot of money too, but it's worth a year or 6months or whatever time you need to afford them, cause when you do get them, you'll have nothing to say.. it's over! Really really over... You found heaven for your ears ........

J
J.L.

A fun U-shaped IEM with reference levels of quality and detail retrieval. It does better with more power/volume pushed into it but sounds great through the Qudelix 5K. The shell size and shape are noticeably bulkier than OracleMK3, but not to an unbearable degree, and I've been able to wear this set fine for a few hours before needing a break. If you have smaller ears, it's best to try other IEMs. Sounds just as "correct yet fun" for electronic beats as it does for Metallica or Celine Dion.

C
C.O.

So the ONLY complaint i have is that i was too cheap to buy them, dont waste your time on $200, $400, or even $800 pairs, go straight to the best, cause the improvements from $200 to $400 etc etc you wont be able to really hear it, you will but it will just be something small and not cost affective, go for the best and get everything your looking for all at once, rather than getting some here and some here which the cost doesnt reflect the "little" improvements youll get. Its like a car why buy a Cadillac when you can afford a Bentley and get all the bells and whistles you could ever want. These have everything that you started out looking for in the beginning of your journey, bass, check, clear mids, check, separation of instruments, check, details, check, magic in the music, check, and most importantly the fun you get from listening to all your music for the first time the way it was meant to be heard!! Save, trust me, go without for how ever long it takes fir u to get them.

C
Chris L.
Fantastic

I'm not sure what I can say that others haven't said already. These sound fantastic, and are very well balanced for my taste. I was worried the bass would be overpowering based on what I'd read prior to purchasing, but I think the low end these are capable of balance out the high end very nicely. I would highly recommend trying different ear tip options, but the stock tips aren't terrible to get you started, especially the foam tips.

D
Daniel W.
Great all-rounder and (but?) heavy on the bass

These are excellent, versatile IEMs for all-rounding across genres and most of their hype is well-deserved. Ample, powerful bass can be difficult to achieve without sacrificing clarity, but the MMK3 delivers (for the most part). With the right eartip fit, there is high resolution with adequate separation, and while it doesn't quite have the soundstage or personality of summit-fi IEMs 2-3x its price, it is an extremely satisfying hi-fi experience well worth its price point.

One important thing I would note that I'm sure others have mentioned is that these are not quite neutral or balanced, but rather somewhat bass heavy, with arguably some encroachment on midrange clarity depending on the existing balance of the song. Whether this makes the song sound better or worse will depend on personal subjective taste. The bassy MMK3 sound definitely has its audience but if you are looking for a more balanced or "clean" tonality, the Prestige LTD might also be worth considering for just a little more.

Aside from the sound, the stock cable and tips are quite good and feel high quality. The default faceplate looks better in person than in pictures and I tend to like the muted "black with accents" more than a lot of the other flashy stuff that's out there. I would also add that many people find these buds rather big, and while I'd definitely agree they feel big in the ear, they are far from uncomfortable.

I would give this 4.4 stars, rounded up for Bloom Audio's excellent speed and service.


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