FATFREQ MAESTRO MINI 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.

FATFREQ MAESTRO MINI
THIEAUDIO Monarch MKIV

HearWiki score

Sound

7.9

9.4

Value

5.8

7.6

Price (USD)

$600

$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 3 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 3 years between them, that is a thin return - treat this as a restyle rather than a new platform.

MAESTRO MINI2022
Monarch MKIV20253 yr newer

Specifications

MAESTRO MINIMonarch MKIV

Type: Wired IEMs; Wired IEMs
Price (USD): $600; $1,150
HearWiki score: 66; 84
Released: 2022; 2025
Availability: Discontinued; Sold new
Driver: 1DD + 2BA hybrid; 2DD + 6BA + 2EST tribrid
Driver type: hybrid; tribrid
Driver configuration: 1DD + 2BA; 2DD + 6BA + 2EST
Driver size: -; 8 mm
Drivers per side: 3; 10
Impedance: 38 Ω; -
Connector: 2-pin 0.78 mm; -

Specification comparison of FATFREQ MAESTRO MINI vs THIEAUDIO Monarch MKIV
Spec	FATFREQ MAESTRO MINI	THIEAUDIO Monarch MKIV
Type	Wired IEMs	Wired IEMs
Price (USD)	$600	$1,150
HearWiki score	66 / 100 Good	84 / 100 Outstanding
Released	2022	2025
Audio
Driver	1DD + 2BA hybrid	2DD + 6BA + 2EST tribrid
Driver type	hybrid	tribrid
Driver configuration	1DD + 2BA	2DD + 6BA + 2EST
Driver size	-	8 mm
Drivers per side	3	10
Impedance	38 Ω	-
Design
Connector	2-pin 0.78 mm	-

What reviewers said

FATFREQ MAESTRO MINI

The FATFREQ MAESTRO MINI is a wired hybrid IEM that leans heavily into bass-forward tuning, delivering a powerful low end that stays impressively controlled for its class. It's a niche pick best suited for bass enthusiasts, though its overall versatility and build quality may not justify its premium price for everyone.

Pro:Powerful yet controlled bass response
Pro:Hybrid driver setup adds clarity in mids and treble
Pro:Decent all-genre usability for a bass-focused IEM

Con:Build quality feels compromised for the price
Con:Sound signature is niche, not for neutral listeners
Con:Lacks universal appeal outside bass-heavy genres

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 FATFREQ MAESTRO MINI THIEAUDIO Monarch MKIV