Astell&Kern A&ultima SP4000 Hi-Res Player, Black with FREE Case Overview
The Astell&Kern A&ultima SP4000 is designed for those who value uncompromising audio quality, elegant design, and smooth day-to-day usability. It's a flagship digital audio player that combines precision engineering with a refined user experience, perfect for discerning listeners, whether you're enjoying hi-res tracks at home or streaming on the move.
With a completely reworked internal architecture and a high-performance processor, the SP4000 delivers outstanding sonic clarity, low distortion, and exceptional control. You can explore your music collection with greater depth and detail, all housed in a body crafted from premium stainless steel and wrapped in a luxury leather case.
Product Ref: 365292
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Unrivalled Sound Clarity
The SP4000 introduces a true Octa audio circuit with a 1:1 pairing of digital processors and DACs—delivering one of the cleanest signal paths ever seen in a portable player. This refined layout eliminates the need to split signals between multiple channels, significantly reducing noise and distortion. What you get is sound that’s vivid and spatially precise. It allows every note, texture, and nuance to come through with startling realism—especially noticeable in complex recordings with layered instruments and wide dynamic range.
Powerful Output with High Driving Mode
To get the most out of your headphones—especially high-impedance models—the SP4000 features High Driving Mode. By doubling the number of OPAMPs and running them in parallel, this mode delivers robust, stable power with no increase in noise. That means you’ll hear deeper bass, more open mids, and shimmering treble, all with excellent control. It’s a feature that ensures your music sounds dynamic and alive, whether you're listening at low volume or pushing your headphones to their full potential.
Lossless Streaming with Full Android OS
With full Android OS integration, the SP4000 offers a smooth and familiar interface, giving you access to your favourite streaming services. But it doesn’t stop there. Astell&Kern’s bespoke ADP (Direct Path) system bypasses Android’s built-in sample rate conversion, enabling bit-perfect playback—even when streaming. You can enjoy studio-quality sound from TIDAL, Qobuz, or your preferred app, without compromise. It blends high-end performance with the convenience of wireless listening, making the SP4000 ideal for modern audiophiles who still demand top-tier sound.
Enhanced Signal Alignment
Group delay—where different frequencies arrive at your ears out of sync—can blur the soundstage and reduce clarity. The SP4000’s proprietary ESA (Enhanced Signal Alignment) technology addresses this by ensuring more consistent timing across the frequency range. The result is purer, more transparent playback, especially noticeable in acoustic recordings, vocals, and live performances. With ESA, the sound feels more coherent and lifelike, helping instruments retain their character and separation, while reducing the smearing that can affect complex tracks.
Designed to Last, Crafted to Impress
The SP4000 is constructed from 904L stainless steel—a premium material typically used in high-end watches. It’s more durable and corrosion-resistant than standard stainless steel, and its polished finish adds a premium touch that lasts. A matching case made from Perlinger’s Shrunken Calf leather complements the design beautifully. Known for its softness, grain, and resilience, this German leather ages gracefully over time. Together, these materials elevate the SP4000 beyond electronics—this is a personal object built to perform and endure.
Tailor Your Sound, Your Way
Everyone listens differently—and the SP4000 embraces that. It includes six user-selectable DAC filters, allowing you to adjust the sound character to your liking. Whether you prefer the laid-back warmth of a slow roll-off filter or the sharper edge of a fast roll-off setting, the player gives you full control. It’s a subtle but rewarding feature, especially for those who enjoy fine-tuning their sound based on music style or mood. With each filter, you shape the sonic signature to reflect your own taste.
Package Includes
Features
- Octa audio circuit delivers ultra-precise, lifelike sound reproduction
- Quad DAC architecture achieves outstanding detail and signal separation
- High Driving Mode offers powerful, stable output for all headphone types
- Enhanced Signal Alignment (ESA) tech improves clarity across all frequencies
- Ultra low-noise LDO regulator ensures a cleaner, purer listening experience
- Full Android OS with custom ADP tech enables bit-perfect streaming playback
- Advanced DAR upsampling enhances depth and realism in digital music
- 6-inch 2K display and 4.5th-gen UI blend clarity with intuitive control
- Premium 904L stainless steel body offers durability with luxury-grade finish
- Wireless file transfer via AK File Drop for convenient music management
- ReplayGain balances volume across playlists for consistent listening
- Supports fast charging via Qualcomm QC 3.0 for quicker top-ups
- Premium leather case included, crafted from German Shrunken Calf hide
- Supports Bluetooth Sink mode to stream music directly from other devices
What's in the Box?
- SP4000
- Protective film
- microSD card slot cover
- USB Type-C cable
- Quick start guide & warranty card
Specifications
General Specifications
| Model | SP4000 (PPF51) |
|---|---|
| Body Color | Black |
| Body Material | Stainless Steel 904L |
| Display | 6inch 2K (2160 x 1080) touch screen |
| Supported Audio Formats | WAVFLACWMAMP3OGGAPEAACALACAIFFDFFDSF |
| Sample rate | PCM : 8kHz 768kHz (8/16/24/32bits per Sample) |
| DSD Native | DSD64(1bit 2.8MHz), StereoDSD128(1bit 5.6MHz), StereoDSD256(1bit 11.2MHz), StereoDSD512(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 (4.4mm, 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 W x H x D | 85mm x 149.8mm x 19.5mm |
| Weight | 615g |
| Feature Enhancements | Firmware upgrade supported (OTA) |
| Operating Temperature | 0? + 40? (32? 104?) |
Audio Specifications
| Frequency Response | ±0.006dB (Condition : 20Hz20kHz) Unbalanced ? ±0.006dB (Condition : 20Hz20kHz) Balanced±0.06dB (Condition : 20Hz70kHz) Unbalanced ? ±0.06dB (Condition : 20Hz70kHz) Balanced |
|---|---|
| S/N | 129dB @ 1kHz, Unbalanced ? 131dB @ 1kHz, Balanced |
| Crosstalk | -136dB @ 1kHz, Unbalanced ? -145dB @ 1kHz, Balanced |
| THD+N | 0.0005 @ 1kHz, Unbalanced ? 0.0003 @ 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 Source
| Clock Jitter | 25pS (Typ) |
|---|---|
| Reference Clock Jitter | 200 Femto Seconds |
Storage Capacity
| Built-in Memory | 256GB [NAND] |
|---|---|
| External Memory | microSD x1 (Max. 1.5TB) |
Battery
| Capacity | 6,780mAh 3.8V Li-Polymer |
|---|---|
| Charge Time | about 5hours (QC3.0 Charging) |
| Playback Time | about 10hours (Standard : FLAC, 16bit, 44.1kHz, Vol.50, LCD Off) |
Supported OS
| Supported OS | Windows 10,11(32/64bit)MAC OS X 10.7 |
|---|
Product Details
| Product code | AKP23 |
|---|---|
| EAN | 8800309909057 |
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