Thieaudio Monarch MK3 VS ThieAudio Monarch MK4
IEM Comparison: Expert & Community Scores Side-by-Side
Thieaudio Monarch MK3 and ThieAudio Monarch MK4 are 2DD+6BA+2EST in-ear monitors. Thieaudio Monarch MK3 costs $1,000 while ThieAudio Monarch MK4 costs $1,149. ThieAudio Monarch MK4 is $149 more expensive. ThieAudio Monarch MK4 holds a slight 0.4-point edge in reviewer scores (8.1 vs 8.5). User ratings place Thieaudio Monarch MK3 at 6.8 and ThieAudio Monarch MK4 at 9. ThieAudio Monarch MK4 has better bass with a 0.5-point edge, ThieAudio Monarch MK4 has significantly better mids with a 1.2-point edge, ThieAudio Monarch MK4 has significantly better treble with a 1.6-point edge, ThieAudio Monarch MK4 has significantly better dynamics with a 1.3-point edge and ThieAudio Monarch MK4 has significantly better soundstage with a 1.5-point edge.
Insights
| Metric | Thieaudio Monarch MK3 | ThieAudio Monarch MK4 |
|---|---|---|
| Bass | 7.5 | 8 |
| Mids | 7.8 | 9 |
| Treble | 7.9 | 9.5 |
| Details | 7.8 | 8.5 |
| Soundstage | 8.5 | 10 |
| Imaging | 7.4 | 8.5 |
| Dynamics | 7.7 | 9 |
| Gaming capabilities | 7.6 | 9.2 |
Thieaudio Monarch MK3 Aggregated Review Score
Thieaudio Monarch MK3 Average Reviewer Scores
ThieAudio Monarch MK4 Aggregated Review Score
ThieAudio Monarch MK4 Average Reviewer Scores
Thieaudio Monarch MK3 Details
Driver Configuration: 2DD+6BA+2EST
Tuning Type: U-Shaped
Price (Msrp): $1,000
Support our free service! Buying through our affiliate links costs you nothing extra:
ThieAudio Monarch MK4 Details
Driver Configuration: 2DD+6BA+2EST
Tuning Type: Harman with bass switch
Price (Msrp): $1,149
Support our free service! Buying through our affiliate links costs you nothing extra:
Thieaudio Monarch MK3 User Review Score
Thieaudio Monarch MK3 Average User Scores
Average User Score:
Based on 1 user reviews
6.8Cautiously Favorable
ThieAudio Monarch MK4 User Review Score
ThieAudio Monarch MK4 Average User Scores
Average User Score:
Based on 1 user reviews
9Outstanding
Thieaudio Monarch MK3 Gaming Score
Gaming Score & Grade
- The gaming score is prioritizing technical capabilities of the IEM (Separation, Layering, Soundstage) and good value.
Gaming Score
7.6Gaming Grade
AThieAudio Monarch MK4 Gaming Score
Gaming Score & Grade
- The gaming score is prioritizing technical capabilities of the IEM (Separation, Layering, Soundstage) and good value.
Gaming Score
9.2Gaming Grade
SThieaudio Monarch MK3 Scorings
Average Technical & Tuning Grades
Average Tunign Grade
A- Well-executed tonal character. No major flaws with good technical control. Smooth presentation works with multiple genres.
Average Technical Grade
A- Good technical performance. Clear separation and decent detail retrieval across various tracks. Soundstage shows reasonable width and depth.
ThieAudio Monarch MK4 Scorings
Average Technical & Tuning Grades
Average Tunign Grade
S-- Highly polished technical execution. Excellent frequency synergy creates an immersive experience. Enhances musical content.
Average Technical Grade
S- Excellent clarity and detail. Precise imaging and expansive soundstage. Manages complex passages with minimal smearing and good transient speed.
Thieaudio Monarch MK3 Reviews
Thieaudio Monarch MK3 reviewed by: Tim Tuned
2025-08-14
7.5
Reviewer Score
MK2 but more fun and more V-shape Not as natural in timbre Tim Tuned Youtube Channel
Thieaudio Monarch MK3 reviewed by:
Fresh Reviews
7*
* The score of this reviewer influences only the Gaming Score
Thieaudio Monarch MK3 reviewed by: Z-Reviews
10
* score normalized
Thieaudio Monarch MK3 reviewed by: Smirk Audio
7.9
Reviewer Score
Elevated, well-textured mid-bass. Pleasant mids. Elevated upper-treble may be pesky to some.
Thieaudio Monarch MK3 reviewed by: Jays Audio
8.5
Reviewer Score
Better low-end texture and overall more engaging than MK2, but lacks the mid-range/vocal magic, so depending on your preference either is great. Still TOTL tech like MK2. Great all-rounder. Jays Audio Youtube Channel
Thieaudio Monarch MK3 reviewed by: Precogvision
7.3
Reviewer Score
Still perplexingly poor bass performance, but improves upon the Monarch MKII's treble extension noticeably. Precogvision Youtube Channel
Thieaudio Monarch MK3 reviewed by: Gizaudio Axel
8
Reviewer Score
I prefer the Monarch MK II for its tonality, vocals, and timbre, but I get why some prefer the MK III. More bass, treble, and detail than the Monarch MK II. The vocal magic of the Monarch MK II is gone.Gizaudio Axel original ranking
Gizaudio Axel Youtube Channel
Thieaudio Monarch MK3 reviewed by: Jaytiss
8.5
Reviewer Score
Fatiging at times for me, too fun at times. Jaytiss Youtube Channel
Thieaudio Monarch MK3 reviewed by: Shuwa-T
8.2
Reviewer Score
Better bass response compared to the mk2 Trades off the lush midrange in place of a cleaner sounding, almost boring midrange
Thieaudio Monarch MK3 reviewed by: Nymz
7.1
Reviewer Score
An improvement in the bass and treble department over the Mk2, but without the same special sauce in the mid-range and with some imaging problems still.
ThieAudio Monarch MK4 Reviews
ThieAudio Monarch MK4 reviewed by:
Fresh Reviews
2025-08-19
9*
* The score of this reviewer influences only the Gaming Score
The ThieAudio Monarch MK4 is a premium IEM that earns a spot in the S-tier for competitive gaming, offering a significant upgrade over its predecessor and A-tier competitors. It features a unique rumble mode switch that adds a satisfying low-end punch and weight without muddying the detailed, reference-grade tuning of the standard mode. While the CNC aluminum build feels exceptional, the design is a bit bulky and heavy, which can lead to some comfort issues during very long, multi-hour sessions.
For gaming, the technical performance is nothing short of phenomenal. The imaging is holographic and the depth perception is absolutely exceptional, providing a critical advantage in tactical shooters like VALORANT where tracking footsteps through walls becomes incredibly precise. The wide and deep soundstage pushes sounds off the player, creating an immersive experience. While rumble mode is preferred for titles like Call of Duty, the standard mode's clean and detailed signature shines in battle royales like Apex Legends, though the 2-4k range can make gunfire a bit shouty at higher volumes.
This is also an absolutely amazing set for music, delivering an elevated level of technicality and resolution. The standard mode offers a fast, clean, and neutral listen with great detail retrieval, while the rumble mode provides a weightier, more engaging bass profile for tracks that benefit from the extra warmth and punch. Ultimately, it's a very high-end IEM that delivers a top-tier experience for both competitive gaming and critical music listening.
ThieAudio Monarch MK4 reviewed by: Super* Review
2025-08-19
7*
* score normalized
Kind of an impressive sound signature. A little bit dry in its bass presentation. Sounds a little bit clinical with its stock tuning. Maybe a bit too much bass in rumble mode. But it's kind of nice to have both tonalities in one IEM.Super* Review original ranking
Super* Review Youtube Channel
ThieAudio Monarch MK4 comes in at $1,150 with a tribrid array—2 DD + 6 BA + 2 EST—a chunky stock cable with friction-fit swappable terminations, and a genuinely excellent, in-ear-operable “Rumble” bass switch. The new metal shells look tidy, but the fit is very large; on average ears it tends to sit a bit out of the concha and feel unstable (seal is doable, comfort is mediocre). Build details like the firm chin slider are nice, yet the cable bulk and loose termination retention detract from daily use.
Tonally, stock MK4 aims for a clean-neutral presentation with a meaty, sub-bass-focused lift, lively upper registers, and excellent extension. The flip side is a slightly dry / clinical character with a hint of treble hardness that can leave notes feeling a bit bodyless. Engaging Rumble mode thickens the curve from ~300 Hz down—more warmth and weight, bordering on “gigabass” territory—making the set fuller and more fun, though arguably too bassy for purists. Staging and imaging are solid, and resolution is high, but macro-dynamics land behind peers; compared side-by-side, sets like Dunu Glacier and 64 Audio U4S feel punchier, while Valhalla sounds warmer, smoother, and more effortlessly resolving.
Overall, MK4 is a technically capable tribrid with two distinct tunings on tap—clinical-clean stock and warmed-up Rumble—but it’s held back by fit size, cable quirks, and that slightly wooden bass texture. For listeners chasing a bright-leaning neutral with legit sub-bass reach (and who can accommodate a big shell), it’s a compelling try; in this lineup, though, it settles at a three-star recommendation next to more engaging or comfortable alternatives.
ThieAudio Monarch MK4 reviewed by: Tim Tuned
2025-08-14
8
Reviewer Score
check links for more info: Tim Tuned Youtube Channel
ThieAudio Monarch MK4 reviewed by: Jaytiss
2025-07-25
9.5
Reviewer Score
Detailed fun, rich bass. It's hard to fault. Jaytiss Youtube Channel
Priced between $1,150 and $1,300 depending on custom faceplate options like the butterfly design shown, the Thieaudio Monarch MK IV boasts exceptional build quality with a large but well-contoured titanium shell offering a secure and comfortable fit. Key features include the innovative rumble switch for adjustable bass levels on the fly, a durable two-pin connector, and a solid feel that inspires confidence in longevity. While the included accessories are considered fair but unexciting, the shell's customization potential and rugged construction are major highlights.
Sonically, the Monarch MK IV delivers a detailed, exciting, and clean sound signature that stands as the best in the Monarch lineage. The rumble switch provides two distinct profiles: the red switch (no rumble) offers a balanced, tactful bass presentation, while the gold switch (rumble) adds a satisfying sub-bass shelf ideal for genres like hip-hop. Treble performance is notably improved over the MK III, though a 10k peak requires careful ear tip selection for some listeners. It trades blows with flagships like the $3,000 Annihilator (better sub-bass focus) and the $1,800 Elysian Apostle (more vocal forward), often matching or exceeding their technicalities while offering its unique tuning flexibility.
Scoring a top-tier 9.8, the Monarch MK IV earns its place through a compelling combination of premium build, the highly functional rumble switch, and outstanding sound quality that feels both special and refined. While acknowledging the high price, it represents significant value against competitors like the $2,000 Thieaudio Valhalla or the fiddly Grand Maestro, offering a feature-rich, durable, and sonically excellent package that justifies its position as a current summit-fi favorite.
ThieAudio Monarch MK4 reviewed by: Jays Audio
2025-07-02
9
Reviewer Score
Smooth, clean, balanced, and slightly airy in the balance switch. Goes from a clean all-rounder to a warm/bassy all-rounder. Great tech. Basically a cheaper Prestige LTD with more tuning options. "Endgame" for most people, but the case is SHIT. Jays Audio Youtube Channel
The Thieaudio Monarch MK IV presents two distinct tuning options, elevating its versatility. The balanced switch delivers a clean, smooth, and slightly airy presentation, offering a refined all-rounder sound that's very detailed, well-layered, and resolving – essentially a direct upgrade to predecessors like the Monarch MK3 and Top Pro, with slightly more treble detail and air. Conversely, the bass switch provides a significantly fuller, warmer low end with punchy, well-textured bass and a tamer upper midrange, addressing criticisms of thinness in earlier models and offering a specialized, engaging listen for bass-heavy genres.
Technically, the MK IV sits comfortably in the $1,000 tier, offering a slight bump in detail retrieval, refinement, and smoothness over the MK3 and MK2, comparable to the Dunu Glacier and Prestige LTD. While not a giant leap, the dual tuning options make it arguably a better all-rounder than single-tuning competitors; the balance switch excels with acoustic, classical, and cleaner genres, while the bass switch shines with rock, metal, R&B, and pop. Build quality is improved with an all-metal shell, though the flimsy cardboard case is a notable disappointment. Vocals are smooth, balanced, and enjoyable, though sets like the Monarch MK2, Mystic 8, RSV, or Arcanis offer more forwardness or unique character. Bass quality is excellent for most, though pure bass enthusiasts might prefer models like the Thieaudio Origin for its unique texture.
Ultimately, the Monarch MK IV is a highly compelling endgame option for the vast majority. It combines strong technical performance with exceptional versatility through its two excellent tunings, covering a wide genre spectrum effectively. While value-focused options like the Top Pro, Volare, or Mega5EST offer similar technicalities at lower prices, the MK IV's refinement, tuning flexibility, and slightly superior performance make it easy to recommend. It allows listeners to leave the hobby satisfied, provided they resonate with its sound – though chasing marginally better flagships involves steep diminishing returns. The king might be debatable, but the MK IV is undoubtedly a very solid $1,000 contender.
ThieAudio Monarch MK4 reviewed by: IEMRanking AI
2025-07-02
9
Reviewer Score
The Thieaudio Monarch MK4 introduces a practical tuning switch, letting users flip between Standard for a neutral, detailed profile and Rumble for a pronounced 3dB sub-bass boost. This flexibility handles diverse genres well, though the thick-shelled aluminum build—while durable—may challenge those with smaller ears. While the modular cable works reliably, its brown "Chocolate" design clashes aesthetically with the IEMs, and the included case feels disappointingly flimsy for the price .
Sound-wise, Standard mode delivers clean mids and airy treble suited for acoustic or jazz, while Rumble mode adds visceral depth to electronic or hip-hop without overwhelming vocals. Technical performance impresses with a wide stage and sharp layering, though the diffuse imaging occasionally lacks density. While not the absolute pinnacle in resolution for its tier, the MK4’s tuning versatility makes it a compelling all-rounder—just don’t expect specialist-level vocal intimacy .
Thieaudio Monarch MK3 User Reviews
Share your experience and build your personal ranking list.
You need to be signed in to write your own reviewIf this is what 'fun' sounds like, I ain't about it.
Pros
Detail retrievalCons
Recessed mids and odd timbre.ThieAudio Monarch MK4 User Reviews
Share your experience and build your personal ranking list.
You need to be signed in to write your own reviewImpressive sound experience and the built quality is finally worth the price (compared to Mk3). I "upgraded" my Mk3 and I am happy with it.