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Description
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: https://www.theaudiostore.in/pages/warranty-claim-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.
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from 7608 reviews
I loved it , surprised totally. What a sound separation.
I was a bit sceptical about ordering it from The Audio Store as I order from Headphone Zone.
But great shopping experience with The Audio Store.
This is first time experienced IEM in ever I love this❤
I’ve been spending some serious time with the Hisenior Mega5-EST paired with the FiiO KA17, and honestly, it’s a killer combo. These IEMs have that nice, punchy bass that makes movies feel immersive, but they quickly settle into a clean, neutral side that I really appreciate. The standout moment for me was listening to Tool’s 'Invincible'—the way this setup handles the complex layers and those dual EST drivers capture the 'air' in the track is just amazing. Everything stays perfectly separated, even when the song gets heavy. Huge thanks to Pritaam for the great interaction and for helping me with the selection ; it’s exactly the kind of balanced, high-performance sound I was looking for.
Good product and excellent packing, pouch was also good quality one
The vocals are excellent, it competes with any IEM priced between 1000-1700. I bought it for less than 1000, so definitely go for it for less than 1000. One more thing, if you're a bass lover, you might find it a bit balanced, meaning it's not as bassy, though vocals are more important to me, so that's why I bought it.
This is awesome. You can hear all frequencies individually with standard level. No comparison with earbuds or wireless headphone
Really liked the design and sound . Am new to IEM’s so really not sure what to expect but sound quality was really good and better then my oneplus buds 4. This review is for newbie like me
Clean sound, loud bass. Pretty balanced overall.It still is a bang for the buck.
👌✌️👍
Observed noticeable difference iin audio quality after using this dac, heard reviews complaining about static white noise but I haven't experienced any such issues yet
EarAudio Headphone Replacement Cable - Black /4.4mm is best in quality for my hifiman edition xs headphones with balanced output.
Earacoustic sta hi -end is premium feeling in this price, I bought this product no damage issue and rich into 4days. Sound quality is awesome 👌 ♥️. This is the newly launched iem.
The Castor Pro (Harman tuned with enhanced bass) is amazing if you love punchy sound. The bass has strong thump and depth, but it doesn’t overpower vocals. Music feels lively and fun, especially for Bollywood and EDM.
Vocals are clear, treble is smooth (no harshness), and overall tuning is well balanced. Very enjoyable for daily listening and workouts.
Verdict: Great earphones if you want powerful bass with good clarity.
The packaging was very good, properly sealed.
Sound quality: If you are balanced sound signature lover, you would love this earbuds, mids, highs, lows everything is very clear.
No sound distortion even in full volume.
Mic Quality is average and ANC is also average. My main priority was sound quality.
Built quality is also good.
If you are planning to buy your 1st IEM around 1k then you must go with this one no other options are valid against it. And Big thanks to Audio store for quick delivery.


















