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Thieaudio Monarch MKII Electrostatic Universal In-Ear Monitor

Regular price $999.00 Sale Save $-999.00 (Liquid error (sections/product-template-2nd-day-ship line 212): divided by 0% OFF)

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Product SKU: Monarch MKII


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Product Details from the Brand

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NEW Tribrid King - 1DD + 6BA + 2EST In-Ear Monitor

  • Upgraded Brand New 10mm Composite Diaphragm Dynamic Driver
  • Balanced Armatures from Sonion and Knowles
  • Sonion Electrostatic Drivers
  • Ultra-pure Silver-plated OCC Copper 26AWG Litz Wires
  • Comes with Smart Switch including 2.5mm 3.5mm and 4.4mm terminations

The King, Retuned and Refined 

More than one and half years after its initial release, the most popular and praised Thieaudio Signature series IEM is ready to make a comeback! The Monarch has been completely redefined with driver overhauls and an enhanced tuning. The Monarch was a monumental milestone for both Thieaudio and the global audio community, hallmarking not only one of the first IEM’s to properly integrate the EST driver technology, but also firmly establishing Thieaudio’s place in the world of Hi-Fi audio. Our R&D team has been following up with the reviews and comments from the audiophile community to refine that which was already one of the most revered monitors of its class and present the ultimate form of the Monarch: Monarch Mark II. 

A New Engine to Set New Limits

Our goal for the Monarch MKII was to enhance its technical performance and introduce a more balanced tuning, while staying true to the original spirit of this monitor. We took this opportunity to update all of the internal drivers, swapping them out for their latest counterparts and rearranging their configurations to achieve an even more optimal performance. 

The 10mm dynamic driver has been upgraded to a brand new composite diaphragm driver. With a tremendous increase in membrane tension and magnet strength, the new driver allows extreme responsiveness. And when engineered to specifically reproduce only the sub-bass frequencies, this dynamic driver becomes a subwoofer, producing even tighter and more impactful kick drum and bass line punches. Additionally, two dedicated subwoofer balanced armature drivers were paired with the dynamic driver, bringing about an immaculate coherency between the lows and the rest of the frequency spectrum. 

The heart of the Monarch has always been its extremely precise and neutral mids that make it such a capable studio monitor. To emphasize this trait, we reconfigured the balanced armature drivers, reinforcing this core range with four mid-frequency drivers. Doubling the midrange drivers from the original Monarch presented incredible advances in technical performance. Distortion was reduced, while the resolution, clarity, and articulation of the mid and treble sections were significantly enhanced. This single change was enough to make the Monarch MKII feel like a completely new beast compared to its predecessor, all the while still maintaining the characteristic studio-neutral midrange. 

The latest electrostatic drivers are incorporated into the Monarch MKII, and rearrangement of driver location has minimized unwanted tubing resonance and extended its high frequency rolloff compared to the original Monarch. This means that the treble range is more even and detailed, and our innovative incorporation of the EST drivers into the setup allows for a greater sense of sparkly, airy, and high-resolution atmosphere in your music. The Monarch MKII continues the Thieaudio legacy of being one of the few in-ear monitors in the world to properly utilize the EST technology. 

Retuned for a Balanced Perfection

One of the controversial sound aspects of the original Monarch was its super defined and emphasized sub-bass. While some enjoyed the clean separation between the sub-bass and the low-mid frequencies, others voiced concern of the sheer quantity of sub-bass. To bring about a resolution, we have slightly decreased the volume of the sub-bass to more appropriate levels, while pushing the low-pass crossover from 150Hz to 200Hz. This change still maintains the clean and punchy subwoofer-like characteristic of the lows that doesn’t muddy the mids, but introduces an ever-slightly warm texture to fundamental low-frequency instruments such as the bass guitar. The mid-frequencies between 200Hz and 1kHz are still kept at a ruler-flat neutral that makes the Monarch MKII an impeccable professional monitoring device. The mid-treble transition between 1 and 2kHz has been pushed back to 3kHz, which reduces any nasal or harsh vocal textures, while still emphasizing the bite and crispness of instruments. Every aspect of the tuning process has been scrutinized, being meticulously tested by ear and measurement equipment, and we are proud to present the perfect vision that is the Monarch MKII. 

The Stock Cable of Monarch MKII

With our new release, we have also upgraded its previous EST cable. Beloved for both its feel and high resolution sonic properties, our EST cable has been one of our top selling products. We have improved the physical texture of the cable by using a soft braided paracord material. The Monarch MKII's stock cable still maintains the ultra-pure silver plated 26AWG OCC copper litz wires, but the additional strand incorporation gives it a slightly meatier feel and a richer sound. Most significantly, this new stock cable features the proprietary "Smart Switch", a new modular plug design, allowing you to choose between 4.4mm balanced, 2.5mm balanced and 3.5mm unbalanced terminations, simply by swapping out the plug ends. This reduces the need for bulky adaptors, giving your setup a more complete look and feel. The 2-pin connectors on the stock cable are also updated to provide a more secure fit with your IEMs.


Model: Monarch MKII

Drivers: 10mm Dynamic Driver, Sonion / Knowless Balanced Armatures Driver, Sonion Electrostatic Driver

Connector: 0.78mm 2PIN

Cable: 26AWG OCC silver plated cable with fabric-coated

Cable Length: 1.2 meters

Plug Type: Smart-switch (2.5mm,3.5mm,4.4mm)

Impedance: 36ohm

Sensitivity: 108db

Nozzle Size(stem): 5.4mm

Nozzle Size (lip): 6mm

Product Reviews

Customer Reviews
4.5 Based on 8 Reviews
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Filter Reviews:
Kyle N.
United States

Pretty Good

Pro- Extremely detailed, nice separation, and great tuning. Con- Very small soundstage and very linear imaging. Overall not bad, but among other iems very good.

Ravi P.
United States United States

Not my preference

Treble can lack air/attack on airy instruments, bass comes off a bit plasticky, midrange tonality and detail retrieval are excellent.

Matt J.
United States United States

Mona MK2 the best?

Crinacle has this set tanked number 1. And please don't get it twisted. This IS a very good set. I don't hesitate suggesting people get it. $999 is a lot of money but this one is probably worth every penny. It's tuned wonderfully. But it isn't in the same league with U12T, MEST mk2, QDC anole etc. It's a larger set so if your ears are on the small side I'd avoid. Imaging is a bit of a letdown, particularly when ranking it above....well every single other IEM on earth. Tuning is S tier though. It's a good to great set.

Paul F.
United States United States


Thieaudio monarch Mk2… absolutely stunning to listen to! I have paired them with a chord mojo 2 and the combination has made me decide to sell my desktop unit (Fiio k9 pro ess) and both pairs of my headphones (focal clear mg and Arya stealth). There is something magical with the way these are tuned. I tried the Blessing 2 Dusk and thought they were fantastic to listen to, however the Monarch mk2 is in a category of their own. They say endgame is a lie, but for now I have found my endgame and I could not be happier!

Isaac G.
United States United States

Thieaudio Win

After using the Thieaudio Monarch MKii for awhile now I'm come to a few conclusions: It's a fantastic IEM! The Mkii fits my library & preferred sound signature pretty much spot-on. I occasionally EQ a tad more bass when I want a little extra "kick", but other than that it's perfect! After changing eartips a few times, I got increased fit & bass performance. (settled on Final Audio "Type E" eartips) to me, the Monarch MKii aren't a uncomfortable IEM, though your mileage may vary of course. Overall, Thieaudio is really pushing value & performance to new lengths and that's certainly the case with the Monarch mkii. I'd recommend them to anyone wanting clear and neutral sounding IEM's that not only sound excellent, but look stunning on top of that!

Audio46 Thieaudio - Monarch MKII Electrostatic Universal In-Ear Monitor Review

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