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 tribrid in-ear monitor that delivers impressive detail retrieval and a well-balanced overall tonality, though its signature is quite specialized and leans clinical rather than universally warm. It shines with separation and layering in complex tracks, making it a strong choice for analytical listening, but its sub-bass presence and treble extension are modest, and the included cable has some ergonomic drawbacks. While a capable performer, its premium price tag may not clearly justify the experience for everyone.

Pro:Excellent separation and layering in complex mixes
Pro:Detailed and resolving treble character
Pro:Natural midrange for vocals and guitars

Con:Tuning can feel clinical and dry
Con:Sub-bass lacks weight and punch
Con:Treble extension is somewhat rolled-off

THIEAUDIO Monarch MKIV

This flagship in-ear monitor packs a ten-driver hybrid setup—pairing dual 8mm dynamics with six balanced armatures and two electrostatic tweeters—to deliver a reference-grade, studio-neutral signature. It also offers a switchable RUMBLE mode for those who prefer a more pronounced low-end, catering to both purists and bass enthusiasts. The wired-only design focuses on audiophile-grade sound without active noise cancellation.

Pro:Reference-neutral tuning with optional bass boost
Pro:Layered, detailed treble from dual electrostats
Pro:Solid build and premium fit for long sessions

Con:No wireless or ANC options
Con:Large shell may not suit smaller ears
Con:Requires a quality source to shine fully

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