Campfire Audio Axion 2025 IEM Review

Campfire Audio has long been associated with high-end, meticulously crafted in-ear monitors (IEMs), and their latest release, the Axion, aims to bring premium sonic characteristics into a more accessible package. Retailing at $249, the Axion introduces a full-range silicon dynamic driver, housed in a uniquely designed shell, complemented by an integrated USB-C cable with a built-in DAC. With a design that prioritizes ease of use while still maintaining audiophile sensibilities, the Axion promises a compelling listening experience. In this review, we will analyze its design, technical specifications, and sonic characteristics in detail.

What Comes In The Box

• Axion Premium High-Fidelity IEM
• USB-C Cable w Mic + Built-in DAC
• Breezy Bag Jr. Lightweight Zipper Case
• Breezy Bag Micro Two-Pocket IEM Pouch
• Assorted Eartips
• IEM Cleaning Tool
• CA Lapel Pin
  

Aesthetics and Functionality

Cool aesthetic, really different design than what we see normally from Campfire. The straight-down wear style ensures a universal fit for all ears, and the different ear tips are great for finding the right fit. Campfire makes this their most accessible earphone by giving you a USB-C cable with a built in microphone and DAC. This bumps up the quality and features you can use with this earphone. 

I found the Axion comfortable to wear and easy to operate. Its USB-C port allowed me to plug directly into my laptop and begin listening, using the internal DAC for an extra upgrade in sound and quality. I didn’t need to use any external gear, so that’s always a win. 

Tech Specs

• Full-Range Silicon Dynamic Driver
• Custom matrix MMCX connectors
• Impedance: 15.3 Ω
• Frequency Response: 5 Hz - 20 kHz
• Sensitivity: 124.1 mVrms
• THD: less than 2%

Listening Review

Soundstage

The Axion impresses with a surprisingly wide soundstage for a dynamic driver IEM at this price point. Imaging is precise and three-dimensional, allowing instruments to be placed with accurate depth and separation. While it doesn’t achieve the holographic layering of higher-end models, it provides ample spatial definition for an immersive, engaging experience. Instrumental positioning feels natural and distinct, enhancing the experience for orchestral, live, and well-recorded studio tracks.

Low Frequencies

Bass response is controlled and articulate, delivering textured sub-bass that enhances electronic and cinematic tracks without overwhelming the mix. The mid-bass punch is snappy and well-defined, adding energy to percussive elements while maintaining balance. Unlike some of Campfire’s more bass-heavy models, the Axion prioritizes clarity over sheer impact, making it a great choice for those who appreciate detailed and natural low-end reproduction. While the sub-bass has good depth and extension, it does not dominate, ensuring that the midrange remains uncolored and transparent.

Midrange Frequencies

Midrange frequencies shine with smooth, organic tonality. Vocals are positioned slightly forward, benefiting from excellent resolution and nuanced articulation. Whether it’s the rich timbre of a jazz vocalist or the layered textures of an acoustic guitar, the Axion ensures midrange elements remain expressive and engaging. Additionally, the built-in DAC contributes to enhanced transient response, allowing instruments to sound realistic and lifelike. The upper mids are particularly well-voiced, ensuring clarity and energy in female vocals and string instruments, while the lower mids retain warmth and body without excessive thickness. The midrange presentation ensures clean separation between instruments, making complex arrangements easy to discern.

High Frequencies

Treble is airy, extended, and non-fatiguing, striking a balance between sparkle and control. The Axion avoids the common pitfalls of excessive sibilance or harshness, ensuring delicate details remain present without becoming piercing. Cymbals, strings, and synths retain natural decay, contributing to a well-balanced treble response that remains engaging without causing listener fatigue. The upper treble extension allows for a sense of air and space, particularly noticeable in live recordings and ambient tracks. High-frequency details are presented with precision and finesse, ensuring that even the subtlest nuances in a mix are audible.

Summary

The Campfire Audio Axion successfully bridges the gap between audiophile-grade sound and everyday convenience, offering a refined yet accessible IEM experience. The inclusion of a USB-C DAC enhances usability, making it an excellent option for those looking to upgrade their mobile and laptop audio without additional accessories.

At $249, the Axion represents a compelling value proposition, offering high-quality materials, meticulous tuning, and seamless integration with modern devices. While bass enthusiasts might prefer a more low-end-heavy profile, those who appreciate balanced, detailed, and immersive sound will find the Axion to be a strong contender in its price range.

The Campfire Axion is available at Audio46.