FiiO FD7 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.

FiiO FD7
THIEAUDIO Monarch MKIV

HearWiki score

Sound

8.2

9.4

Value

5.8

7.6

Price (USD)

$820

$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 2 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.

FD72023
Monarch MKIV20252 yr newer

Specifications

FD7Monarch MKIV

Type: Wired IEMs; Wired IEMs
Price (USD): $820; $1,150
HearWiki score: 71; 84
Released: 2023; 2025
Availability: Still sold new; Sold new
Driver: 12 mm dynamic; 2DD + 6BA + 2EST tribrid
Driver type: dynamic; tribrid
Driver configuration: -; 2DD + 6BA + 2EST
Driver size: 12 mm; 8 mm
Drivers per side: 1; 10
Frequency response: 10 Hz - 40 kHz; -
Impedance: 50 Ω; -
Sensitivity: 111 dB/mW; -
Active noise cancelling: No; -
Controls: buttons; -
Weight: 11 g; -
Detachable cable: Yes; -
Connector: 4.4 mm balanced; -

Specification comparison of FiiO FD7 vs THIEAUDIO Monarch MKIV
Spec	FiiO FD7	THIEAUDIO Monarch MKIV
Type	Wired IEMs	Wired IEMs
Price (USD)	$820	$1,150
HearWiki score	71 / 100 Good	84 / 100 Outstanding
Released	2023	2025
Audio
Driver	12 mm dynamic	2DD + 6BA + 2EST tribrid
Driver type	dynamic	tribrid
Driver configuration	-	2DD + 6BA + 2EST
Driver size	12 mm	8 mm
Drivers per side	1	10
Frequency response	10 Hz - 40 kHz	-
Impedance	50 Ω	-
Sensitivity	111 dB/mW	-
Features
Active noise cancelling	No	-
Controls	buttons	-
Design
Weight	11 g	-
Detachable cable	Yes	-
Connector	4.4 mm balanced	-

What reviewers said

FiiO FD7

The FiiO FD7 is a wired flagship in-ear monitor that pairs a 12mm dynamic driver with a semi-open acoustic design for a spacious, detailed listen. It's built for audiophiles seeking high resolution and natural tonality, with a 4.4mm balanced connection and detachable cable for easy upgrading. Easy to drive despite its 50-ohm impedance, it delivers strong dynamics and a wide soundstage without needing amplification.

Pro:Excellent detail retrieval and resolving power
Pro:Wide, immersive soundstage with strong imaging
Pro:Natural, clean tonality across the frequency range

Con:No active noise cancellation, limiting isolation
Con:Semi-open design may leak sound in quiet settings
Con:Higher price point limits accessibility

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 FiiO FD7 THIEAUDIO Monarch MKIV