Astell&Kern Pathfinder

Second fruit of the collaboration between the Korean audiophile player manufacturer and the Californian in-ear artisan, the Pathfinder takes up the torch from the Solaris X with a completely redesigned architecture. Six drivers per side, an innovative balanced armature technology developed by Knowles, and attention to detail that extends to the included accessories: this piece hand-assembled in Campfire Audio’s Portland workshop displays technical ambitions worthy of its high-end positioning.

A three-way hybrid assembly

The Pathfinder is based on a three-way configuration combining two types of complementary drivers. The bass frequencies and part of the midrange are handled by two 10mm dynamic drivers with hybrid PU + LCP diaphragms, housed in a 3D-printed acoustic chamber. This chamber incorporates the Radial Venting technology developed by Campfire Audio, which evacuates the air pressure generated by the diaphragm movement to preserve speed and precision of response in the lower spectrum.

The midrange benefits from an innovative driver: a dual-chamber balanced armature designed by Knowles specifically for this model. Its operating principle is similar to that of a twin-cylinder engine, where a single coil drives two separate diaphragms each housed in its own chamber. This design achieves superior efficiency in a reduced footprint, while promoting a warmer and more natural reproduction of voices and midrange instruments.

The treble is handled by two dual balanced armatures combined with the T.A.E.C. (Tuned Acoustic Expansion Chamber) system. This tuned expansion chamber, a Campfire Audio signature, replaces traditional tubes and damping filters with a calibrated air volume in front of the driver, which preserves clarity and extension in the upper spectrum while limiting listening fatigue.

Construction and ergonomics

The machined aluminum shells receive a black anodized treatment called “Night Sky”. Their rounded shape is inherited from the Solaris, but in more compact proportions despite the number of drivers on board. The weight remains contained at 8 grams per earpiece, which contributes to stable wearing without a feeling of heaviness.

The brushed stainless steel faceplate features a six-facet pattern named “Mountain Peak”, which echoes the angular lines of Astell&Kern players. These facets are produced individually then assembled to create a characteristic play of light and shadow. The nozzles, also in stainless steel, are hand-polished and feature a grille with eight circular openings. Their fairly generous diameter (approximately 6mm) requires finding the right tips among the eleven pairs provided.

The MMCX connectors use a copper-beryllium alloy more resistant to wear than the usual brass, ensuring better longevity of connections after multiple cable plugging and unplugging.

Three cables for extended compatibility

The box includes three silver-plated copper cables, terminated respectively in 3.5mm jack, 2.5mm balanced and 4.4mm Pentaconn. This provision allows the Pathfinder to be used with virtually all players and amplifiers on the market without additional purchase.

These cables adopt an original flat design where the four conductors run side by side rather than braided. This arrangement limits tangling and reduces friction noise (microphonics) when the cable brushes against clothing. The flexible coating and metal overmolding of the connectors complete a careful construction.

Sound signature and pairings

With an impedance of 6.2 Ω and a sensitivity of 94 dB at 1 kHz, the Pathfinder proves easy to drive in terms of volume, but fully reveals its qualities with sources having low output impedance. Astell&Kern players or quality desktop amplifiers constitute natural partners to take advantage of its resolution.

The reproduction favors balance between registers with a slight boost in the bass, which brings body and impact without encroaching on the midrange. The vocal range maintains a strong presence, while the treble, crisp and detailed, can be demanding with lower quality recordings. The soundstage offers good width and clear separation of instruments, with a sense of proximity reminiscent of closed-back headphone listening.

Technical Specifications

General Configuration

• Type: in-ear, closed
• Number of drivers: 3

Construction

• Aluminum shell
• Polished stainless steel nozzle
• Copper-beryllium alloy MMCX connector
• Radial venting technology

Drivers

• Highs: 2 dual balanced armatures + TAEC (Tuned Acoustic Expansion Chamber)
• Mids: 2 “dual chamber” balanced armatures by Knowles
• Lows: 2 10 mm drivers with radial venting technology

Audio Performance

• Frequency response: 5 Hz - 20 kHz
• Sensitivity: 94 dB at 1 kHz / 13.49 mV RMS
• Impedance: 6.2 Ω at 1 kHz
• Total harmonic distortion: < 1%

Included Accessories

• Silver-plated copper cables:
  • 2.5 mm version
  • 3.5 mm version
  • 4.4 mm version
• Eartips:
  • 5 pairs of Final Audio Type E (TXS, TS, TM, TL, TXL)
  • 3 pairs of Campfire Audio Marshmallow (S, M, L)
  • 3 pairs of silicone (S, M, L)
• Others:
  • Cleaning tool
  • Leather zippered case
  • Protective pouch