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ASTELL & KERN SP4000
Reference Hi-Res Player.
Octa-DAC: 4x AK4499EX + 4x AK4191 for pure sound and 131 dB SNR
High Power Mode: Excellent control with demanding headphones
ESA Technology: Improves clarity and frequency alignment
Full Android + ADP: Bit-perfect streaming (Tidal, Qobuz, etc.)
DAR 2nd Gen Remaster: Harmonic recovery and more natural sound
6" 2K Display + Refreshed UI: Fluid visuals and precise control
904L Stainless Steel Chassis + Premium Leather Case
Connectivity: Dual Wi-Fi, BT 5.0 (LDAC, aptX HD), USB DAC, Optical
Up to 10 hours of battery life with 6780 mAh
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Astell&Kern A&ultima SP4000. Ultimate Sound Without Compromise
The Astell&Kern A&ultima SP4000 represents the pinnacle of portable audio engineering. As the brand’s new flagship digital audio player, it sets a new benchmark in high-end Hi-Res playback, featuring a revolutionary Octa-DAC architecture, native DSD512 support, a full Android OS, and a 904L stainless steel body. Designed for demanding audiophiles, the SP4000 delivers unmatched power, accuracy, and luxury in a single, stunning device.
Octa-DAC Architecture for Unprecedented Fidelity
The SP4000 integrates four AK4499EX DACs and four AK4191 modulators, enabling true 1:1 signal conversion without loss. The result is a breathtaking signal-to-noise ratio of 131 dB, with crystal-clear sound, exceptional detail, and expansive channel separation for a truly immersive listening experience.
High-Power Mode and Advanced Amplification
With twice the number of op-amps compared to the SP3000, the SP4000 includes a high-power output mode that ensures effortless control of even the most demanding headphones. Experience pure dynamics, a three-dimensional soundstage, and distortion-free performance at any volume.
ESA: Enhanced Signal Alignment Technology
Proprietary ESA technology (Enhanced Signal Alignment) optimizes phase alignment, minimizes group delay, and improves sonic clarity and coherence—offering a more natural and realistic listening experience.
Pure Copper Shielding & High-Density PCB
Engineered with a 99.9% pure copper shield and a high-density HDI circuit board, the SP4000 minimizes electromagnetic interference and preserves signal purity across all internal components.
Full Android + Bit-Perfect Playback
The first Astell&Kern DAP to feature full Android OS with Astell&Kern Direct Path (ADP), allowing bit-perfect playback without sample rate conversion (SRC). Ideal for native playback of streaming services like TIDAL, Qobuz, or Apple Music at their highest resolutions.
Advanced DAR (Digital Audio Remaster) Technology
With second-generation digital remastering and Virtual Sound Extension (VSE), the SP4000 restores lost harmonics and enhances the sonic image—perfect for maximizing the quality of your Hi-Res files.
6-Inch 2K Touchscreen & Premium UI
Featuring a vibrant 6” 2K IPS touchscreen (2160x1080), the SP4000 delivers stunning visual clarity and smooth navigation. The newly redesigned 4.5-generation GUI offers intuitive control, while the precision-machined metal volume wheel adds a tactile, luxurious touch.
Luxury Craftsmanship with 904L Stainless Steel
Built from 904L stainless steel, the same material used in luxury watchmaking, the SP4000 exudes durability, elegance, and premium feel. It includes a handcrafted Perlinger calf leather case made in Germany for added protection and style.
Technical Specifications
DAC Architecture: Octa-DAC – 4x AK4499EX + 4x AK4191
Processor: Qualcomm Snapdragon 6125 Octa-Core, 8 GB RAM
Storage: 256 GB internal + microSD (up to 1.5 TB)
Operating System: Full Android with ADP (bit-perfect)
Display: 6” 2K touchscreen (2160x1080 px)
Outputs: 3.5 mm unbalanced, 4.4 mm balanced, Optical
Formats: MQA support, Native DSD512
Bluetooth 5.0: LDAC, aptX HD, LHDC
Wi-Fi: Dual-band
Battery: 6780 mAh – Up to 10 hours playback, Quick Charge 3.0
Why Choose the SP4000?
The A&ultima SP4000 is more than a music player—it’s the most advanced portable Hi-Fi system ever created by Astell&Kern. With unmatched DAC architecture, uncompromising amplification, and a design built from luxury materials, it’s the perfect companion for audiophiles seeking absolute sonic perfection in a portable form.
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