Wired IEMs
Campfire Audio Alien Brain - Hybrid IEM
69Good
$1,000
Full review dataCampfire Audio Alien Brain - Hybrid IEM 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
THIEAUDIO Monarch MKIV
84Outstanding
$1,150
Full review dataScore 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.
- Campfire Audio Alien Brain - Hybrid IEM
- THIEAUDIO Monarch MKIV
HearWiki score
69
84
Sound
8.1
9.4
Value
6.4
7.6
Price (USD)
$1,000
$1,150
Specifications
Alien Brain - Hybrid IEMMonarch MKIV
- Type
- Wired IEMs
- Wired IEMs
- Price (USD)
- $1,000
- $1,150
- HearWiki score
- 69
- 84
- Released
- 2024
- 2025
- Availability
- Discontinued
- Sold new
- Driver
- 5-driver hybrid
- 2DD + 6BA + 2EST tribrid
- Driver type
- hybrid
- tribrid
- Driver configuration
- -
- 2DD + 6BA + 2EST
- Driver size
- 10 mm
- 8 mm
- Drivers per side
- 5
- 10
- Frequency response
- 5 Hz - 20 kHz
- -
- Impedance
- 7.8 Ω
- -
- Sensitivity
- 94 dB/mW
- -
- USB-C
- Yes
- -
- Connector
- MMCX
- -
What reviewers said
Campfire Audio Alien Brain - Hybrid IEM
The Campfire Audio Alien Brain is a five-driver hybrid IEM that blends a robust low end with natural mids and a smooth, detailed treble, offering a balanced yet engaging sound. Its low impedance and high sensitivity make it easy to drive from most sources, while the compact build and generous accessory set add to its premium appeal. Overall, it presents a cohesive, musical tuning that should satisfy a wide range of listeners.
- Pro:Balanced, broadly appealing tuning
- Pro:Strong yet controlled bass
- Pro:Easy to drive with any source
- Con:Low impedance may hiss with some sources
- Con:Not for those seeking a radical sound signature
- Con:Premium price point
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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