Letshuoer EJ07 vs THIEAUDIO Monarch MKIV: which should you buy?

On aggregated review scores the THIEAUDIO Monarch MKIV comes out ahead with a HearWiki score of 84. The full breakdown - sub-scores, specs and what reviewers actually said - is below.

Our pick: THIEAUDIO Monarch MKIV - Outstanding overall at around $1149.

Wired IEMs

Score breakdown

Each axis is a 0–10 blend of what reviewers scored, not a lab measurement.

THIEAUDIO Monarch MKIV leads on 3 of 4 measures.

Letshuoer EJ07
THIEAUDIO Monarch MKIV

HearWiki score

Sound

7.3

9.4

Value

2.0

7.6

Price (USD)

$900

$1,150

Generation & platform

The scores rank quality. This is the other question: is the newer one actually newer technology, or the same platform in a new shell?

Same generation

The THIEAUDIO Monarch MKIV is 6 years newer, but it is the same generation of hardware: nothing in the radio, the codecs or the noise cancelling separates them. Nothing separates them on convenience features either, so the choice comes down to tuning and price. For 6 years between them, that is a thin return - treat this as a restyle rather than a new platform.

EJ072019
Monarch MKIV20256 yr newer

Specifications

EJ07Monarch MKIV

Type: Wired IEMs; Wired IEMs
Price (USD): $900; $1,150
HearWiki score: 60; 84
Released: 2019; 2025
Availability: Discontinued; Sold new
Driver: tribrid; 2DD + 6BA + 2EST tribrid
Driver type: tribrid; tribrid
Driver configuration: -; 2DD + 6BA + 2EST
Driver size: 10 mm; 8 mm
Drivers per side: -; 10
Impedance: 17 Ω; -
Active noise cancelling: No; -

Specification comparison of Letshuoer EJ07 vs THIEAUDIO Monarch MKIV
Spec	Letshuoer EJ07	THIEAUDIO Monarch MKIV
Type	Wired IEMs	Wired IEMs
Price (USD)	$900	$1,150
HearWiki score	60 / 100 Average	84 / 100 Outstanding
Released	2019	2025
Audio
Driver	tribrid	2DD + 6BA + 2EST tribrid
Driver type	tribrid	tribrid
Driver configuration	-	2DD + 6BA + 2EST
Driver size	10 mm	8 mm
Drivers per side	-	10
Impedance	17 Ω	-
Features
Active noise cancelling	No	-

What reviewers said

Letshuoer EJ07

The Letshuoer EJ07 is a wired tribrid in-ear monitor that delivers strong technical performance, particularly in separation and layering, with a clean, resolving character that suits vocals and guitars. Its tuning leans clinical and specialized, with a lighter sub-bass and subdued highs, which may not appeal to all listeners. While it excels in clarity and detail, its high price and some cable quirks make it a niche choice rather than a universal recommendation.Pros: ["Excellent separation and layering for complex tracks", "Resolving and detailed treble extension", "Clean, well-defined midrange for vocals and guitars", "Solid build quality with a premium feel"], "cons": ["Clinical tuning that may lack warmth", "Sub-bass presence is limited", "Treble can sound subdued or rolled-off", "High asking price relative to overall value"]}

THIEAUDIO Monarch MKIV

The Monarch MKIV is a flagship in-ear monitor built around a ten-driver tribrid configuration, blending dual 8mm dynamic drivers, six balanced armatures, and two electrostatic tweeters. It offers a studio-neutral sound signature with an additional switchable bass-boost mode for listeners who prefer a more impactful low end.

Pro:Reference-grade neutral tuning with excellent clarity
Pro:Versatile bass boost mode adds flexibility
Pro:Detailed and extended treble from electrostatic tweeters

Con:High price point limits accessibility
Con:Requires a capable source to perform at its best
Con:Large shell may not suit smaller ears

Summaries are AI-condensed and paraphrased from published reviews and specs - not original hands-on testing. More on our method.

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New comparison Letshuoer EJ07 THIEAUDIO Monarch MKIV