ThieAudio Monarch MKII IEM

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The king is back and is new and improved! Introducing the ThieAudio Monarch MKII. Using feedback from the audiophile community, this in-ear monitor takes what it does best and improves on it to give you an IEM that’s fit for royalty!

The King is Back!
The ThieAudio Monarch is back and it’s better than it ever was. The Monarch MKII’s tuning has been redefined with driver overhauls. To design this IEM, experts from the R&D team took the reviews and comments from the audiophile community to improve on one of the most revered monitors of its class. The Monarch MKII includes a more balanced sound signature with all the drivers being updated & rearranged for a power-packed performance.

Let the Bass Drop
The original Monarch had a super defined and emphasized sub-bass. While some enjoyed the clean separation between the sub-bass and the low-mid frequencies, others were concerned about its quantity. To improve the resolution, ThieAudio added a 10mm composite diaphragm to the dynamic driver. This created a high membrane tension and magnet strength for extreme responsiveness.

Sub-Bass that Creates an Impact
When engineered to reproduce only sub-bass frequencies, the dynamic driver becomes a subwoofer, producing even tighter and more impactful kick drums and basslines. This ensures a clean and punchy subwoofer-like sound that doesn’t muddy the mids but adds a slightly warm texture to low-frequency instruments like the bass guitar. In addition, this IEM also features two dedicated subwoofer balanced armature drivers. The low-pass crossover was pushed from 150Hz to 200Hz for better coherency between the lows and the rest of the frequency spectrum.

Natural & Well-Balanced Mids
The heart of the Monarch i.e. the precise and neutral mids has been retained, making it perfect for studio monitoring. To reinforce this, the mid-frequency drivers were doubled to four balanced armatures for low distortion and high clarity and resolution. This keeps the frequencies between 200Hz and 1kHz ruler flat while the mid-treble transition between 1 and 2kHz has been pushed back to 3kHz for lower nasal and harsh vocal textures, while still emphasizing the bite and crispness of instruments.

EST Drivers, Now Even Better!
The Monarch is one of the few IEMs to incorporate EST drivers successfully. The new version rearranges the new drivers to minimise unwanted tubing resonance and extends the treble roll-off. This gives you even and detailed high-frequencies with improved sparkly, airy, and high-resolution atmosphere in your music. Each aspect of this IEM has been meticulously tested by ear and measurement equipment to bring ThieAudio’s vision to life.

About ThieAudio
What do you get when you bring together the best & most innovative engineers in the industry? That’s what ThieAudio set out to find out as a creative platform by Linsoul Audio. Each person in the team is carefully selected to inspire revolutionary IEMs for audiophiles, professional musicians and audio enthusiasts alike.

About the Signature Series
After the runaway success of the Phantom, Voyager and Legacy series, ThieAudio decided to once more raise the bar with the Signature Series. This series features the latest driver technology from the Danish manufacturer, Sonion — the Electrostatic (EST) tweeter. This driver utilises an ultralight membrane in a small tweeter chamber that’s powered by an independent transformer that extends the treble range up to 80kHz.

Model: Monarch MKII
Drivers: (1DD + 6BA + 2EST) 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: 5.4mm
Warranty Period: 1 Year

Warranty Period: 1 Year from the date of Invoice
Covered: Manufacturing Defects Only
Warranty Form:

ThieAudio is a popular brand among audiophiles, known for its high-quality wired headphones and in-ear monitors (IEMs). They offer a wide range of models with varying sound signatures to suit different preferences. ThieAudio is also known for their premium cables and accessories for audio enthusiasts.

Customer Reviews

Based on 8 reviews
Nandalal Sarkar (Kolkata)
All rounder

Any song will play effortlessly. Mids are clear and treble is also good, Bass is good.

I connected it with questyle m15 bang on.

Thank you for your review! We're glad to hear that you are enjoying the ThieAudio Monarch MKII IEM's all-around performance, with clear mids, good treble, and strong bass. It's great to know that you have also found a perfect match with the Questyle M15. Happy listening!

Subin (Pune)
Tuned to perfection !!!

Just the right amount of treble...extra clear mids(u can hear each n every is a detail expert)...and right amount of boosted bass to make it enjoyable !!! Does justice to all fenres of music. Using it with fiio KA5 which just gives it a wider soundstage and textured bass...makes it better than with ibasso dc06 which is more clearer...but very close n intimate which i dont prefer. Using it with spinfit w1 which gives better fit and comfort... as the stock tip are quite stiff causing discomfort. Love the monarch mk 2 :D

Wow, thank you for your great review of the Thie Audio Monarch MKII IEM! We're glad to hear that you're happy with the sound quality of the IEMS and that they tune perfectly to your personal preferences. We think that they're great for all types of music - from classical to metal - and would be happy to hear your thoughts on other genres too!

Balaji d (Vellore)
Awesome IEM

This is probably the best iem I’ve ever heard
20 hours of burn in will open up the drivers,
The sound is neutral, feels airy, I’m totally happy with the purchase .
Thanks to Pritham for suggesting me this gem🙏

Thank you for your kind words! We're so glad you're happy with your purchase of the ThieAudio Monarch MKII IEM.

Sandeep Agarwal (Bengaluru)
Monarch MK2

This IEM will stay with me for a very long time. Superb for daily listening and also an excellent refrence point for premium IEM's.

Sameer Tangri (Bengaluru)
Incredibly fun!

I have been using these daily (5+ hours) for more than a week now. It took me a few days to truly realize what a marvel these Monarch MKIIs are! Read on.
My setup includes using these on my laptop via my iFi Audio - ZEN DAC V2 and iFi Audio - ZEN CAN Signature HFM (Amp) via the 4.4 balanced output as well as on the Quedlix 5k DAC-Amp via the 2.5 balanced output. Source: Apple Music, Youtube Music (Premium).
You can run through these excellent test tracks to examine various aspects of your headphones/IEMs and trust me, you will see your equipment’s capabilities in a new (and hopefully good) light after that. OR Btw, I think the Monarch MKIIs slayed all these tracks and it was difficult for me to fault it anywhere. You can of course find faults if you search hard enough but then as a consumer, you listen to music for enjoyment and not to look so hard for faults (with a microscope).
An important observation- for me, the Monarch MKII’s sound quality improved a lot after 2-4 days of usage (daily 5+ hours). Everything became more pronounced, tighter, clearer, separated, and airier. The in-ear fit also improved for me as the days passed. I am using the ‘S’ foam tips. I also note that if you’re using these IEMs over Bluetooth, LDAC is your best bet for exploiting the full potential. The iPhone's AAC is just not good enough over Bluetooth.
Physical aspects: As my first flagship IEM, I initially found the size to be a little bigger than usual. I was not used to this category and type of IEMs before. However, after use, I see that it sits fine in my medium-sized ears offering long (3+) hours of listening sessions with comfort. The passive sound isolation is also very good with low (20-25%) volume music being enough to mask any sounds that still trickle in, including human voices. The build quality is superb, and the cable is something you must see and touch to understand! Basically, one can carry around and use this with confidence. No flimsy or delicate parts, wires, jacks, or joints on this one. The case is also spacious, well-built, and on the larger side. Do note that the IEMs themselves are very delicate and handle them with care when picking them off or placing them on tables and other hard surfaces.
Sound Quality: The sound quality is very impressive! Many times, it's as if it has almost entered open-back headphone territory (I own the Hifiman Ananda too). All this coming in such a small, pocket-friendly, and portable package is mind-blowing! You cannot carry a full-sized open-back headphone during travel. But carrying this IEM is surely an option and it helps to get sound quality so much closer to open backs.
The sound is not overly analytical/critical or flat. It has the right tuning to give a fun but natural sound. It’s the kind I can listen to for hours. The bass is hefty and good, but never overpowering. Mids. are well-presented and very visible when they must be (vocally intense songs). Treble and clarity too are very nicely presented, but never harsh or sibilant. Layering and separation are also very good - complex tracks with busy passages having excessive multiple instruments playing simultaneously are delivered well. The soundstage is average though – it is more of a ‘most sounds coming from the left & right at shoulder width’ case. In some tracks, you will feel the base at the jaw while the treble is a little higher. But it’s never the kind of soundstage that will make you look at the door when you hear a knock in the music/movie. The sounds keep around (mostly left-right) and close to your head.
Additional observations- the Monarch pairs exceptionally well with the Quedelix 5k DAC-Amp. The sound is at another level! This works so good for a portable setup in the house as well as while traveling.
One more thing- make sure you talk to Pritam from TAS once before you finalize your purchase. Explain your music preferences, likes, and dislikes to him. He is knowledgeable and hence guides the purchases very well.

Vijay Kumar (Gurgaon)
Really good IEM

This is really good IEM. Very sturdy IEM. Little more bass for my taste. Clean mids. God spacious sound stage. However I find Fiio FD7 much more dynamic, with right amount of bass, more cleaner, holographic imaging and good soundstage. This could be just personal choice.

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