Features Octa Audio Circuit Architecture With AK4191 & AK4499EX Chips

Astell&Kern SP4000 features a revolutionary 1:1 circuit design that pairs one AK4191 digital processor with one AK4499EX DAC. This improved architecture delivers cleaner signals with better separation compared to the SP3000's 1:2 design. The SP4000 processes digital and analogue signals separately, using the AK4191EQ modulator to reduce noise before the DAC handles analogue conversion, resulting in superior sound quality and delivering an unprecedented level of sound quality, supporting high-resolution PCM playback up to 32-bit/768kHz and native DSD512.

Fused With High Driving Mode For Premium Sound Performance

Astell&Kern SP4000 features two OPAMPs (operational amplifiers) arranged in parallel to deliver rich and more detailed sound. This parallel configuration expands the driving range horizontally without increasing noise or reducing the signal-to-noise ratio. The result is greater dynamic range and enhanced sound detail. The High Driving Mode provides powerful, stable output and reproduces even the most delicate sonic details with precision, letting you experience deeper, clearer, and more immersive music.

Minimised Group Delay With Proprietary Enhanced Signal Alignment Technology

Astell&Kern SP4000 features proprietary ESA technology that significantly improves one of audio’s long-standing challenges-group delay. In audio, group delay occurs when different frequencies (like bass and treble) take varying times to pass through a system, causing them to arrive at slightly different moments. The SP4000's ESA technology helps all frequencies arrive at the same time, resulting in clearer, purer sound that's more true to the original recording.

Ultra Low Noise LDO Regulator for Top-Tier Noise Suppression

Astell&Kern SP4000 features a new LDO (Low Dropout) Regulator in its power supply that reduces noise by up to 97% compared to previous models. These high-performance regulators, commonly used in precision medical devices and 5G communication equipment, stabilise battery voltage and suppress noise effectively. The result is clean and pure sound reproduction.

Features High-Quality Any Layer HDI PCB Technology For Refined Audio

To achieve the highest sound quality, 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. It minimises signal loss, enabling the delivery of a more refined and detailed sound.

Equipped With Full Android OS Integration For Endless Music Streaming

Astell&Kern has integrated full Android OS support for the first time in their players that enables to install any app via the Google Play Store. Through its proprietary ADP (Astell&Kern Direct Path) technology, Astell&Kern overcomes the Android OS's sampling rate conversion (SRC) limitation. This enables bit-perfect, lossless playback even while streaming, ensuring the highest possible sound quality. The SP4000 combines flagship-level audio quality with enhanced convenience, marking its evolution into a sophisticated next-generation digital audio player.

Features Advanced Digital Audio Remaster & TERATON ALPHA Technology

Astell&Kern SP4000 equips an advanced DAR, Astell&Kern's second-generation Digital Audio Remaster technology, to deliver more natural and refined sound. The process works in two stages: First, the SP4000 uses VSE (Virtual Sound Extender) to restore lost harmonics, enhancing sound quality at the source. Then, the advanced DAR engine performs precise upsampling for complete audio restoration. This dual-stage approach produces deeper, more immersive sound that more faithfully reproduces the original recording. The Astell&Kern’s TERATON ALPHA, a high-end audio solution combining a HEXA-audio circuit and dual audio paths for precise sound, stable amplification, and efficient power with noise cancellation, ensuring pure, high-fidelity audio performance.

Seamlessly Drive Your Music With The Latest Snapdragon Octa-Core CPU

A&ultima SP4000 features a Snapdragon 6125 Octa-core processor, delivering exceptional sound quality, faster system response, and a smoothly functioning redesigned interface. With its high-performance CPU and doubled 8GB of DDR4 memory, the system provides stable and fluid operation. The processor integrates CPU, memory, and wireless communication components into a single system on chip (SoC), with digital circuits consolidated in one area. This design maximises space for audio circuits while minimising heat generation and digital noise.

Provides Extended Storage With 10 Hours Of Playback & Wireless File Transfer

The Astell & Kern SP4000 offers comprehensive connectivity with 256GB internal storage (expandable to 1.5TB via microSD), . The ReplayGain feature maintains consistent volume levels across tracks, while AK File Drop enables wireless file transfers between the device and PCs, smartphones, or FTP programs on the same network, allowing completely cable-free operation. The device supports Qualcomm QC 3.0 fast charging, reaching full charge in about 4 hours and providing up to 10 hours of playback time.

Seamless Connectivity Options For Easy Pairing & Comes Roon Ready

Astell&Kern SP4000 supports both aptX™ Adaptive and LDAC™ codecs, offering audiophiles multiple options for wireless 24-bit audio playback. Through its BT Sink functionality, the SP4000 can connect to external devices via Bluetooth and serve as a Bluetooth DAC, enabling high-quality playback from devices like smartphones while leveraging its advanced audio capabilities. The device features dual-band Wi-Fi, DLNA networking, and USB DAC compatibility for Mac and Windows PCs. The SP4000 will include Roon Ready support once testing and final certification by Roon Labs is complete.

Fused With Crossfeed technology & Customise Your Audio Conveniently

Astell & Kern SP4000 features an innovative Crossfeed technology that reduces listening fatigue during extended headphone use. By intelligently blending audio signals between the left and right channels with precise timing control it creates a more natural soundstage similar to listening through speakers. Users can customise their listening experience through adjustable parameters, including Shelf Cutoff, Shelf Gain, and Mixer Level settings.

Meticulously Crafted Using Stainless Steel 904L With 99.9% Pure Copper Shield Can

Astell & Kern SP4000 showcases groundbreaking innovation with its 904L stainless steel construction - a first in portable audio player history. This premium material, traditionally reserved for luxury timepieces, elevates the SP4000 beyond a mere digital device to a true luxury artefact. The 904L stainless steel, while more challenging to manufacture than conventional stainless steel, offers superior durability and corrosion resistance. Its distinctive lustre and timeless beauty mirror the quality found in high-end luxury watches. The device combines a high-gloss polished 904L stainless steel front panel with a PVD-coated ceramic back panel, exemplifying the perfect fusion of technology and artistry. It is equipped with a 99.9% pure copper Shield Can to block various types of noise and electromagnetic interference that could affect the audio block, but also delivers sound that is clearer and more distinct than ever before.

Thoughtfully Crafted & Built Around 3 Core Principles - Edge, Simple & Sensibility

Astell & Kern SP4000 features the Crimson Theme interface, which emphasises clean, minimalist design and intuitive navigation. It features an upgraded UI that perfectly balances functionality with visual appeal. Its standout feature is an elegant LP animation that activates while browsing albums, enhanced by the distinctive Crimson theme that embodies Astell&Kern's premium design philosophy. Built around three core principles - Edge, Simple, and Sensibility - the interface delivers exceptional usability while maintaining AK's distinctive style. The thoughtfully chosen black and red colour scheme helps reduce eye strain while optimising battery life and thermal efficiency. Its distinctive volume wheel features precise geometric patterns inspired by light piercing through darkness, providing perfect tactile feedback.

Comes With A Premium Leather Case To Protect Your SP4000

Astell&Kern SP4000 features a premium leather case crafted through an aniline dyeing process, with proprietary pigments added to achieve deep, vibrant colours. Their advanced anti-ageing treatment ensures lasting richness, while master craftsmen inspect every detail during rigorous quality control to ensure perfection. The case design features precision-cut openings for all ports and controls, allowing full functionality while providing maximum protection. The interior is lined with microfiber to prevent scratches, while the exterior's natural grain patterns make each case unique. This exceptional attention to detail and craftsmanship make the case a fitting companion to the SP4000's premium build quality.