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Astell&Kern A&ultima SP4000 Flagship Digital Audio Player
  • Astell&Kern A&ultima SP4000 Flagship Digital Audio Player
  • Astell&Kern A&ultima SP4000 Flagship Digital Audio Player
  • Astell&Kern A&ultima SP4000 Flagship Digital Audio Player
  • Astell&Kern A&ultima SP4000 Flagship Digital Audio Player
  • Astell&Kern A&ultima SP4000 Flagship Digital Audio Player showing playback screen with red album art on white background
  • Astell&Kern A&ultima SP4000 Flagship Digital Audio Player with angular black design and volume dial on white background
  • Astell&Kern A&ultima SP4000 Flagship Digital Audio Player angled view showing sleek black body and control knob on white background
  • Astell&Kern A&ultima SP4000 Flagship Digital Audio Player angled view showing screen and volume knob on white background
  • Astell&Kern A&ultima SP4000 Flagship Digital Audio Player side view highlighting geometric design and control wheel on white background
  • Astell&Kern A&ultima SP4000 Flagship Digital Audio Player showing playback screen with red geometric album art
  • Astell&Kern A&ultima SP4000 Flagship Digital Audio Player in silver with geometric design and volume knob on white background
  • Astell&Kern A&ultima SP4000 Flagship Digital Audio Player with angled volume wheel and metallic body on white background
  • Astell&Kern A&ultima SP4000 Flagship Digital Audio Player angled view with music playback screen and silver metal body on white background
  • Astell&Kern A&ultima SP4000 Flagship Digital Audio Player side profile view with silver metallic finish on white background
  • Astell&Kern A&ultima SP4000 Flagship Digital Audio Player in gray leather case showing music playback screen on white background
  • Astell&Kern A&ultima SP4000 Flagship Digital Audio Player in textured gray leather with metal control knob on white background
Astell&Kern A&ultima SP4000 Flagship Digital Audio Player

Astell&Kern A&ultima SP4000 Flagship Digital Audio Player

$4,499.00

All Models Now Shipping!
Updated: April-09-2026

Built on three years of relentless innovation since the SP3000, the Astell&Kern A&ultima SP4000 pushes the boundaries of portable audio with cutting-edge technology and refined sound performance.

Order now to reserve this product before regular stock becomes available.

Expected to ship in 1-2 weeks.
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KEY FEATURES

-Enhanced Signal Processing with Octa-Audio Circuitry Design
-High Driving Mode Delivers Premium Sound Quality
-Proprietary Enhanced Signal Alignment (ESA) Technology Minimizes Group Delay
-Ultra Low Noise LDO Regulator for Top-Tier Noise Suppression
-Advanced Digital Audio Remaster (DAR) Technology
-Full Android OS Support
-New 4.5 Generation User Interface

What's In the Box

• A&ultima SP4000

• Premium German Leather Case

• USB-C cable

• Quick start guide

• microSD card slot cover


Features

•Stainless Steel 904L Body
6" 2K (2160x1080) Touch Screen
Octa-Core CPU
AKM4191 x4 + AKM4499EX x4 DAC Chipset (Real Quad DAC)
256GB Built-In Memory
MicroSD x1 (Max. 1.5TB)
USB Type-C Input
Unbalanced 3.5mm Out, Optical 3.5mm Out, Balanced 4.4mm (only 5-pole supported) Out
Firmware Upgrade Supported
4hrs Charge Time
10hrs Playback Time
Windows 10,11(32/64bit) MAC OX X 10.7 Supported

Specs

• Frequency Response: ±0.006dB (Condition : 20Hz~20kHz) Unbalanced │ ±0.006dB (Condition : 20Hz~20kHz) Balanced ±0.06dB (Condition : 20Hz~70kHz) Unbalanced │ ±0.06dB (Condition : 20Hz~70kHz) Balanced
-S/N: 129dB @ 1kHz, Unbalanced │ 131dB @ 1kHz, Balanced
-THD+N: 0.0005% @ 1kHz, Unbalanced │ 0.0003% @ 1kHz, Balanced
-Crosstalk: -136dB @ 1kHz, Unbalanced │ -145dB @ 1kHz, Balanced
-IMD SMPTE: 0.0004% 800Hz 10kHz (4:1) Unbalanced │Balanced
-Output Impedance: Unbalanced Out 3.5mm (0.7ohm) │ Balanced Out 4.4mm(1.7ohm)
-Clock Jitter: 25pS (Typ), Reference: 200 Femto Seconds
-Battery Capacity: 6,780mAh 3.8V Li-Polymer

Close-up of the Astell&Kern A&ultima SP4000 Flagship Digital Audio Player, showcasing its sleek metallic finish, angular design, and textured control knob. The subtle Astell&Kern branding highlights its premium build and audio quality.

Over-ear headphones on a stand, an Astell&Kern A&ultima SP4000 Flagship Digital Audio Player with earphones connected, and earphones on glass, all set against a white textured background. The player displays a music track.

Overall rating: 5.0 / 5 from 3 reviews.

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Reviews

In class all by itself

"Outstanding Performance by Astell kern sp4000 I am an Astell fan on the get go . I owned the sp2000 ( sold) and now I have the sp3000 copper and the se300 and as of yesterday acquired the sp 4000 copper. Lots of hesitation due its humongous price tag but I still pulled the trigger and no regrets. . night and day if you ask me. I am no audio expert but like music… I can hear instruments that I couldn’t hear before. . soundstage is out of this world. . absolutely extremely happy with this device. . it is highly priced for a reason. ."

— Assane C. (5/5)

Magnificiency

"First of all thanks to HeadAmp team. It was great talking to you and arrange my order, on the last day of the year. I always feel confident dealing with you, even on (for my budget) relevant items. This is my second A&K, as I decided to upgrade from SE300. I use my DAPs in multiple scenarios like running with bone conduction headphones, while driving in bluetooth with internal speakers, with bluetooth headphone in the office (Noble Fokus Rex5) and with Empire Ears Odin when I want to disappear from reality. The SP4000 covers all of the above but the running part (for its weight), but it brings sound, experience, emotion to a whole new level. I have a phenomenal HiFi (and I truly mean it) in my pocket, in my car, in my office. Qobuz works perfectly, while I am dropping Tidal, for signal instability reasons. But, as a streamer, and connected to an Audio Research pre-amp, with high res files, … wow. Yes, just speechless. Worth every single penny. Best. Alessandro"

— Alessandro T. (5/5)

A winner

"The first dap I have had that actually sounds great with Focal Utopia headphones. Utopias are very transparent and show any flaws in the front end. Maybe not quite as good as my desktop set up but that is pretty high end with Aurender N10 streamer, Merason dac1 and Feliks Euforia. The Sp4000 is in the ballpark of that setup, pretty amazing for a dap. Iloaded about 1tb onto a microsd card on my computer, put it in the dap, and it read it and categorized it no problem. Also sounds great and easily drives Sennheiser hd800s headphones. I don't own any high end gem's but it sounds also great with my Campfire Andrometa's. Streaming through Qobuz seems as good as local files. My only complaint so far is that when you put it in the supplied case you can't really swipe down to access the various functions in that menu. I also fed it into my speaker system through line out single ended and it sounds not as good as the above dac and streamer into my tube amp, but really sounds quite good, and I would probably be happy with it as a source if I didn't have a pretty high end front end."

— Paul B. (5/5)

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