Astell&Kern SP4000 – The New Pinnacle of Portable Audio

At Audio Concierge, we’ve always sought to curate and showcase the finest expressions of audio engineering. That’s why we’re thrilled to share the global debut of Astell&Kern’s next-generation flagship Digital Audio Player, the A&ultima SP4000 — a device that redefines what’s possible in portable sound.

Following three years of meticulous evolution since the SP3000, the SP4000 stands as a testament to Astell&Kern’s uncompromising pursuit of sonic perfection. It represents not just a step forward, but a complete recalibration of what high-resolution audio on the move should sound like.

Where Innovation Meets Refinement

Unveiled to the world at High End Munich 2025 (May 15–18, Hall 1, Booth D03), the SP4000 boasts a suite of groundbreaking technologies designed to extract every nuance and every whisper of emotion, from your music.

Key Features That Define a New Era

✅ Octa-Audio Circuitry Design
An evolved signal path that delivers a purer, more defined audio signature, engineered for the most demanding of ears.

✅ High Driving Mode
Provides superior headroom and dynamic range, allowing even the most power-hungry headphones to perform at their peak.

✅ Enhanced Signal Alignment (ESA) Technology
Astell&Kern’s proprietary innovation that dramatically reduces group delay — preserving timing, space, and musical integrity.

✅ Ultra-Low Noise LDO Regulator
This ensures blacker backgrounds and breathtaking resolution, even in the quietest passages.

✅ Advanced Digital Audio Remaster (DAR)
Breathing new life into digital recordings, DAR technology refines audio signals to achieve stunning realism.

✅ Full Android OS Support
Opening up seamless access to streaming services and intuitive control within a rich, fluid environment. Finally unlocking an Astell&Kern Flagship player.

✅ New 4.5 Generation UI
A redesigned interface delivering smoother navigation and a more immersive listening experience.

Experience It First

We invite you to witness the unveiling of the SP4000 at High End Munich 2025, where Astell&Kern will host live demos at Hall 1, Booth D03. For those seeking the apex of musical engagement on the move, the SP4000 offers an experience that is truly transcendent.

At Audio Concierge, we’ll be among the first to explore and evaluate the SP4000 in depth — and, as always, offer bespoke guidance to clients seeking to pair it with the perfect in-ear or over-ear partner. We suspect it will pair exceptionally well with many earphones here at Audio Concierge but we will be providing the SP4000 with oBravo’s Ra Volution as the ultimate in high fidelity.

If you demand more from your music — if you hear beyond the ordinary — the SP4000 awaits.

The future of portable audio is here.