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Solaris X


Astell&Kern, a global leader in high-resolution audio playback devices and accessories, announces a new collaboration with Campfire Audio to produce in-ear monitors (IEMs) under the Astell&Kern brand.  The limited-edition Solaris X is the first product to be released under the new collaboration. 

Newly Designed Drivers
The SOLARIS X is based on the popular Campfire Solaris 2020 IEM, but features a new custom Balanced Armature (BA) driver for high frequency response that was designed specifically for the AK SOLARIS X. This driver is smaller in size than the ones used in existing Solaris models. The new custom BA driver produces a more neutral response in comparison to the current Campfire Audio Solaris 2020 model. Coupled with Campfire’s patented tuned acoustic expansion chamber (T.A.E.C.) technology, the new driver offers smooth and extended high frequencies.
Tuned Acoustic Expansion Chamber™ (T.A.E.C™)
Our tuned acoustic expansion chamber technology allows us to deliver extended high frequencies without sibilance or fatigue. We optimize our driver performance by adjusting the volume of space available in front of the driver. This is superior to the typical "Tube+Dampener" system because it provides a direct passage from the driver to your ear, which results in unsurpassed clarity and extension.
Solid Body
Close attention to detail is critical to delivering you the superior musical experience from our earphones. Solaris features an acoustically optimized interior model that allows each driver to deliver the very best sound quality. When heard together, the drivers offer a seamless musical experience as a result of this process.
Polarity Tuned Chamber™ (P.T.C.™)
Our Polarity Tuned Chamber allows us to optimize the sonic performance of our dynamic drivers. Deploying particular volume cavities, both in front of and behind our dynamic driver, we can pull bigger sounds from smaller drivers. This also gives us the ability, in the case of hybrid designs, to specifically target the driver performance.
4N Silver Litz Balanced Cable
Beryllium/copper MMCX connectors on the IEM are more resilient against wear and tear than regular brass connectors. The AK SOLARIS X comes with a balanced 2.5mm pure silver cable allowing the earphones to reach their full performance potential. Pure Silver Litz Cable is produced with four 4N (99.99% purity) conductors to offer clearer, extended sounds. The jacket that wraps around each conductor ensures both flexibility and durability. At the same time, it is soft to touch and a practical to use every day. A matching 2.5mm to 3.5mm adapter is provided for use with a variety of playback devices.
Handcrafted IEM Made in the USA
AK SOLARIS X is hand-assembled in Portland, Oregon, USA by skilled craftsmen, ensuring each individual earphone is manufactured to the highest quality standards.

AK x CFA Solairs X


[Highs] Customized BA Driver+T.A.E.C x1
[Mids] Newly Customized BA Driverx1
[Mids+Lows] Specifically Tuned Dynamic Driver + Polarity Tuned Chamber x1

Frequency Response



94dB @ 1kHz: 9.16mVrms


8.1 Ohm @ 1kHz




Eco-Friendly Cork Case x1
Campfire Mesh Bag (L)x1
Campfire Mesh Bag (S)x1
2.5mm-3.5mm Connector x1
Final Type Earpiece (SS/ S/ M/ L/ LL)
Comply Foam (S/M/L)
Cleaning Stick x1


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