Astell&Kern A&Ultima SP4000 / SP 4000 Digital Audio Player - Silver

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Model SP4000 (PPF51)
Body Color Black, Silver
Body Material Stainless Steel 904L
Display 6inch 2K (2160 x 1080) touch screen
Supported Audio Formats WAV, FLAC, WMA, MP3, OGG, APE, AAC, ALAC, AIFF, DFF, DSF
Sample rate PCM : 8kHz ~ 768kHz (8/16/24/32bits per Sample) DSD Native : DSD64(1bit 2.8MHz), Stereo | DSD128(1bit 5.6MHz), Stereo DSD256(1bit 11.2MHz), Stereo | DSD512(1bit 22.4MHz), Stereo
Output Level Unbalanced 4.1Vrms │ Balanced 8.2Vrms (Condition No Load)
CPU Octa-core
DAC AKM4191 x4 + AKM4499EX x4 (Real Quad DAC)
Decoding Support up to 32bit / 768kHz Bit to Bit playback
Input USB Type-C input (for charging & PC & MAC)
Outputs Unbalanced Out (3.5mm), Optical Out(3.5mm) Balanced Out (4.4m, only 5-pole supported)
Wi-Fi 802.11 a/b/g/n/ac (2.4/5GHz)
Bluetooth V5.0 (A2DP, AVRCP, Qualcomm aptX HD, LDAC, LHDC, SBC, AAC)
Dimensions 3.34” (85mm)[W] x 5.89” (149.8mm)[H] x 0.76” (19.5mm)[D]
Weight About 21.7oz (615g)
Feature Enhancements Firmware upgrade supported (OTA)
Operating Temperature 0℃ ~ + 40℃ (32℉~ 104℉)
Remarkably Close to PerfectionThe A&ultima SP4000 is Astell&Kern’s newest flagship digital audio player, the result of three years of relentless research and innovation following the development of the SP3000.
Built upon an advanced Octa audio circuit architecture, the SP4000 distills the purest essence of audio engineering, delivering a sound experience unlike anything before it—refined, powerful, and remarkably close to perfection. Discover the SP4000 and experience sound on an entirely new level.
Snapdragon Octa-Core CPUA&ultima SP4000 is equipped with a Snapdragon 6125 Octa-core processor, so you can enjoy the overwhelming sound, faster system response and a redesigned generation user interface that moves comfortably and smoothly. Featuring a high-performance CPU and improved 8GB of DDR4 memory, the more powerful system is stable with fast and fluid movement.
To maximize the efficiency of the circuit and reduce heat, the CPU, memory and wireless communication parts are configured as one module, with the digital circuit parts arranged in the same area creating a single system on a chip (SoC).


Advanced Engineering for Unmatched ClarityHigh Driving Mode
The SP4000 features twice as many OPAMPs arranged in parallel compared to its predecessor, delivering richer and more detailed sound. High Driving Mode provides powerful and stable output—much like a four-wheel-drive vehicle confidently navigating rough terrain. It’s designed to reproduce even the most delicate sonic details with precision.
Enhanced Signal Alignment Technology
The SP4000 features proprietary ESA (Enhanced Signal Alignment) technology, which significantly improves one of audio’s long-standing challenges, group delay. ESA technology aligns frequency signals to arrive more uniformly, minimizing frequency distortion and dramatically enhancing sound clarity and purity.
Top-Tier Noise Suppression
The SP4000 features a newly implemented LDO (Low Dropout) Regulator in its power supply, which reduces noise by up to 97% compared to previous models. LDO Regulators help stabilize battery voltage and effectively suppress noise, resulting in cleaner, purer sound.
Precision Sound with Any Layer HDI PCB
To minimize signal loss, the SP4000 incorporates top-tier Any Layer HDI (High-Density Interconnect) PCB technology. Commonly used in smartphones and high-performance electronic devices, this advanced circuit board allows for the precise design of complex circuitry within a compact space.