Astell&Kern is closing out 2025 by adding two heavy hitters to its lineup, and both land squarely in the high-end lane the brand has owned for more than a decade. The new AK HC5 USB DAC brings the flagship-class AK4499EX DAC chip to a pocket-friendly form factor, while the STELLA IEM arrives as a reference-level collaboration with VOLK Audio and GRAMMY-winning mastering engineer Michael Graves.
Together they showcase the company’s familiar blend of meticulous engineering, premium materials, and sound tuning that leans toward accuracy rather than theatrics. Full specifications are still on the way, but here is what has been confirmed so far.
Astell&Kern AK HC5 USB DAC with Flagship AK4499EX Chipset
The $450 AK HC5 is a compact USB DAC built to raise the performance ceiling of phones, laptops, and even gaming consoles without adding bulk. It’s small enough to live in a pocket but engineered to deliver clean, controlled, and detailed playback across a wide range of source devices.
At its core is the AK4499EX DAC, a component normally found in Astell&Kern’s top-tier DAPs. It’s paired with the AK4191EQ digital processor, which splits the digital and analog signal paths to lower noise and maintain resolution. The result is a design aimed at preserving detail rather than reshaping it.
Astell&Kern also brings over key architecture from the SP4000 DAP, including High Driving Mode and a horizontal OP AMP layout. These choices are meant to provide stronger drive capability and a more stable presentation than what most portable DACs deliver, keeping the HC5 firmly in the “serious tool in a small chassis” category rather than a novelty accessory.
Astell&Kern designed the HC5 with real-world listening conditions in mind, where power quality and noise are often the weakest links. The built-in amplifier is tuned for high PSRR (Power Supply Rejection Ratio) and CMRR (Common Mode Rejection Ratio) performance, giving the DAC a cleaner and more stable power foundation even when it’s connected to noisy sources like smartphones or laptops. This approach minimizes input-borne interference and allows the AK4499EX to operate at its intended level.
The HC5 also addresses cable-related noise with a Dual Noise-Shielded Cable that uses tin-plated copper conductors, aluminium film shielding, and an additional braided shield. The goal is straightforward: protect the signal from electromagnetic interference and maintain consistency in environments where portable audio gear usually struggles.
Astell&Kern AK HC5 Dongle DAC
The HC5 includes a 150-step volume wheel that uses the same precision encoder found in Astell&Kern’s digital audio players, giving users granular control without relying on the source device’s volume handling. A 1.62-inch OLED display provides clear system and playback information at a glance, which is a useful addition compared to screenless portable DACs.
For additional flexibility, the HC5 offers DAR upsampling with support up to PCM 384 kHz and DSD256, as well as six selectable DAC filters for users who want to tailor the presentation. Compatibility is broad thanks to support for both UAC 2.0 and 1.0, ensuring high-resolution playback on typical mobile and desktop sources while retaining native functionality with consoles like the PlayStation and Nintendo Switch.
Astell&Kern also includes a protective case made by Italian supplier Synt3, adding some day-to-day durability without compromising the device’s compact form factor.
Astell&Kern STELLA IEMs
The $3,900 STELLA IEMs were developed with VOLK Audio and refined through detailed tuning sessions with Michael Graves, giving them a clear role as the most technically focused earphones in Astell&Kern’s lineup. They’re designed to deliver consistency, control, and accuracy rather than a flashy signature.
STELLA uses a 12-driver quadbrid system built around four transducer types, a proprietary 6-way crossover, and five individually tuned sound tubes. This layout is intended to keep each driver working within its optimal range while maintaining a coherent presentation from bass through upper treble.
Astell&Kern’s engineering, VOLK Audio’s design work under Jack Vang, and Graves’ mastering perspective all feed into the final voicing. Calibration sessions at Osiris Studio in Los Angeles were used to finalize the balance, grounding the STELLA in a studio-informed tuning approach rather than a generalized consumer curve.
STELLA is built around a 6061-T6 aluminum shell finished in satin-black anodizing to manage stiffness, resonance, and long-term wear. The stainless-steel faceplate frame is machined to tight tolerances and incorporates venting into the structure, while an optical-grade 9H sapphire glass panel adds durability without adding weight. A central aluminum plate carries the Astell&Kern and VOLK Audio logos, keeping the design consistent with the collaboration behind it.
Its driver system is divided into clearly defined roles. The LF-H low-frequency hybrid module pairs VOLK’s M9-R 9 mm dynamic driver with dual balanced armatures in a two-stage chamber intended to maintain bass control and impact. The midrange relies on three balanced armatures tuned for clarity and vocal accuracy.
The HF-H high-frequency hybrid system combines VOLK MP-2 dual planar magnetic drivers with four electrostatic tweeters, extending the response into the upper treble with output to 45 kHz. Each driver operates in its natural range without added digital correction, aiming for consistency through acoustic design rather than DSP.
The supplied cable uses a mix of 5N LCOFC copper, 4N silver, and 24K gold conductors in a 12-strand Litz configuration with a reinforced fiber core and a 4.4 mm balanced termination, matching the IEMs’ focus on mechanical stability and clean signal transfer.
The Bottom Line
Full specifications for the AK HC5 and STELLA are still on the way, but the information released so far makes their positioning clear. The HC5 lands in a competitive pocket-DAC segment where cheaper options like the Fosi Audio ZH3 and iFi Hip-DAC 3 exist, yet its $450 price places it closer to more advanced units such as the Cayin RU9. Its use of the AK4499EX and the SP4000-derived architecture suggests Astell&Kern is aiming for a level of refinement that sits above the entry-tier portable DAC crowd.
STELLA, meanwhile, walks straight into the ultra-premium IEM arena. At roughly $4,000, it leapfrogs Astell&Kern’s already expensive Luna and squares up against models like the Noble Kronos.
The quadbrid driver system, VOLK Audio collaboration, and studio-based tuning sessions make it clear that STELLA is not intended as a mainstream flagship but as a reference-level product for listeners who prioritize accuracy, materials, and engineering rigor over mass-market tuning trends.
Price & Availability
AK HC5 and STELLA will make their public debut on December 13-14 at both the Potafes Akihabara in Japan and the 2025 Guangzhou Headphone Show in China. The products will be on sale at authorized Astell&Kern retailers from January 2026.
- AK HC5: $450 USD (UK SRP: £399 | EU: €499)
- STELLA – Astell&Kern x VOLK Audio x Michael Graves: $3,900 USD (UK SRP: £3,899 | EU: €4,400)
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