{"product_id":"astell-kern-sp4000-series-portable-music-player","title":"Astell \u0026 Kern SP4000  Series Portable Music Player","description":"\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eSP4000T:\u003c\/h4\u003e\n\u003cp\u003e\u003cmeta charset=\"UTF-8\"\u003e\u003cspan\u003eThe SP4000T is the industry's first DAP to feature the MIL-Spec vintage vacuum tube RAYTHEON JAN6418 in a Quad configuration.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eWith independent dual-tube structures dedicated to the left and right channels respectively, the channel-separated design — once exclusive to home audio high-end tube amplifiers — has finally been brought to the world of DAPs.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eBut the essence is not the number of tubes. Managing multiple highly sensitive vacuum tubes is far more than a simple matter of addition. It demands answers to countless questions: How do you pair tubes with subtly different noise characteristics and gain rates? How do you overcome microphonic noise? How do you minimize output variation between left and right channels?\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eThe four tubes in the SP4000T do not operate independently — they work in a differential configuration, with each pair facing the other in mirror symmetry. In this precise balance, music signals are amplified with twice the clarity, while common-mode noise is mutually cancelled and eliminated.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eEach of the four tubes is precisely measured for its noise and gain characteristics before being paired, then fully isolated from noise through independent modular flexible PCBs and a multi-layered architecture — a design that only Astell\u0026amp;Kern, with its long experience in analog circuits and vacuum tubes, could bring to life.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eWhen four hearts beat as one in perfect balance, the tube's signature rich harmonics resonate with the deepest, most resonant sound ever heard in the SP4000T.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"UTF-8\"\u003e\u003cspan\u003eThe SP4000T is the industry's first DAP to feature Triple Tube Mode. Combined with the T Series Signature Triple AMP Mode and the Tube Current level adjustment first found on the SP3000T, it offers up to 54 possible combinations tailored to any genre or preference — a true Analog Sound Palette.\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0065\/4432\/6771\/files\/Image_8_8163ff23-5ea3-4d92-ba6a-575c0da1de39.jpg?v=1781898208\" alt=\"a diagram of a grid\" data-ac-alt-type=\"image\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"UTF-8\"\u003e\u003cspan\u003eBeyond just two modes — Tube AMP and OP AMP — a next-generation Hybrid AMP mode lets you handpick your preferred tonal character. Combining the analog sensibility with the advantages of high-resolution output, the five-stage HYBRID AMP mode allows you to freely dial in the perfect sound for your taste and your music.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThe greatest technical challenge in applying vacuum tubes to a compact portable device is achieving low noise even at high resolution and high output. The SP4000T features twice as many tubes as its predecessor — four in total — and introduces an upgraded 5-stage 2nd Generation Architecture (up from the previous 4-stage design) to suppress microphonic noise (noise generated in vacuum tubes from even minor external vibrations). Drawing on Astell\u0026amp;Kern's proprietary know-how and years of experience, repeated rounds of design, testing, and verification led to the optimal solution for overcoming the structural limitations of microphonic noise.\u003cbr\u003e\u003cbr\u003e1. Separate modular Flexible PCB, isolated from Main PCB\u003cbr\u003e2. Silicone base cushion for primary shock absorption of the tube\u003cbr\u003e3. Custom-fit silicone tube around tube leads to absorb impact transmitted through the leads\u003cbr\u003e4. Silicone damper encasing the tube, suspending it mid-air at the damper tip\u003cbr\u003e5. Copper Shield Can covering the entire tube, suppresses even the faintest micro-noise\u003c\/p\u003e\n\u003cp\u003eThe SP4000T inherits the beloved High Driving Mode from the SP4000, acclaimed by audiophiles worldwide. With twice as many OPAMPs arranged horizontally, it delivers even greater sonic density. Like a four-wheel-drive vehicle conquering rough terrain, High Driving Mode channels superior driving power to produce a stronger, more stable sound — precisely articulating even the most easily missed sonic details, and designed for a deeper, more vivid listening experience.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eSPECIFICATIONS:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e SP4000T (PPF52)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody Color:\u003c\/strong\u003e Silver, Copper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody Material:\u003c\/strong\u003e Stainless Steel, Copper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplay:\u003c\/strong\u003e 6inch 2K (2160 x 1080) touch screen\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupported Audio Formats:\u003c\/strong\u003e WAV, FLAC, WMA, MP3, OGG, APE, AAC, ALAC, AIFF, DFF, DSF\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSample Rate:\u003c\/strong\u003e PCM: 8kHz ~ 768kHz (8\/16\/24\/32bits per Sample)\u003cbr\u003eDSD Native: DSD64 (1bit 2.8MHz), Stereo \/ DSD128 (1bit 5.6MHz), Stereo\u003cbr\u003eDSD256 (1bit 11.2MHz), Stereo \/ DSD512 (1bit 22.4MHz), Stereo\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Level:\u003c\/strong\u003e Unbalanced 4.2Vrms │ Balanced 8Vrms (Condition No Load)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCPU:\u003c\/strong\u003e OCTA-Core\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDAC:\u003c\/strong\u003e AKM4191EQ x2 + AKM4499EX x2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVacuum Tube:\u003c\/strong\u003e RAYTHEON JAN6418 x4 (Quad Tube)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDecoding:\u003c\/strong\u003e Support up to 32bit \/ 768kHz Bit to Bit playback\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput:\u003c\/strong\u003e USB Type-C input (for charging \u0026amp; PC \u0026amp; MAC)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutputs:\u003c\/strong\u003e Unbalanced Out (3.5mm), Optical Out (3.5mm)\u003cbr\u003eBalanced Out (4.4m, only 5-pole supported)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWi-Fi:\u003c\/strong\u003e 802.11 a\/b\/g\/n\/ac\/ax (2.4\/5GHz)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBluetooth:\u003c\/strong\u003e V5.2 (A2DP, AVRCP, Qualcomm® aptX™ HD, LDAC, LHDC, SBC, AAC)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 3.37” (85.7mm) [W] x 5.9” (150mm) [H] x 0.76” (19.5mm) [D]\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e About 19.9oz (565g)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFeature Enhancements:\u003c\/strong\u003e Firmware upgrade supported (OTA)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e 0℃ ~ +40℃ (32℉ ~ 104℉)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eAUDIO SPECIFICATIONS\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency Response:\u003c\/strong\u003e ±0.006dB (Condition: 20Hz ~ 20kHz) Unbalanced │ ±0.006dB (Condition: 20Hz ~ 20kHz) Balanced\u003cbr\u003e±0.06dB (Condition: 20Hz ~ 70kHz) Unbalanced │ ±0.06dB (Condition: 20Hz ~ 70kHz) Balanced\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eS\/N:\u003c\/strong\u003e 124dB @ 1kHz, Unbalanced │ 125dB @ 1kHz, Balanced\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrosstalk:\u003c\/strong\u003e -136dB @ 1kHz, Unbalanced │ -145dB @ 1kHz, Balanced\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTHD+N:\u003c\/strong\u003e 0.0006% @ 1kHz, Unbalanced │ 0.0004% @ 1kHz, Balanced\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIMD SMPTE:\u003c\/strong\u003e 0.0004% 800Hz 10kHz (4:1) Unbalanced │ Balanced\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Impedance:\u003c\/strong\u003e Unbalanced Out 3.5mm (0.7ohm) │ Balanced Out 4.4mm (1.7ohm)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCLOCK SOURCE\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eClock Jitter:\u003c\/strong\u003e 25pS (Typ)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReference Clock Jitter:\u003c\/strong\u003e 200 Femto Seconds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eSTORAGE CAPACITY\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-in Memory:\u003c\/strong\u003e 256GB [NAND]\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExternal Memory:\u003c\/strong\u003e microSD x1 (Max. 1.5TB)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eBATTERY\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCapacity:\u003c\/strong\u003e 7,450mAh 3.8V Li-Polymer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCharge Time:\u003c\/strong\u003e About 5 hours (PD3.0 Charging)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlayback Time:\u003c\/strong\u003e About 10 hours (Standard: FLAC, 16bit, 44.1kHz, Vol.80, LCD Off, Low Gain)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eSUPPORTED OS\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eWindows 10, 11 (32\/64bit), MAC OS X 10.7\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eSP4000:\u003c\/h4\u003e\n\u003cp\u003eThe new top of the line Astell \u0026amp; Kern SP4000 features cutting edge technology and specifications that surpass the SP3000. T\u003cspan\u003ehe 4000 represents three years of research and innovation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cmeta charset=\"UTF-8\"\u003eThe SP4000 features 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\u003cmeta charset=\"UTF-8\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThe SP4000 features a 1:1 architecture. This new structure, where one AK4191 digital processor is paired with one AK4499EX DAC, allows digital signals to be delivered precisely to a single DAC without the need to distribute noise, enabling improved signal separation and processing. Through continuous research and innovation in circuit technology, the SP4000 successfully implements a true Quad DAC—a feat previously considered impossible due to noise and other issues. As a result, the SP4000 achieves an impressive SNR (Signal-to-Noise Ratio) of 131dB, on par with the independent dual audio circuit of its predecessor.\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"UTF-8\"\u003e\u003cspan\u003eThe 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, allowing you to enjoy deeper, clearer, and more immersive music.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cmeta charset=\"UTF-8\"\u003eThe SP4000 also 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.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA newly implemented LDO (Low Dropout) Regulator in its power supply,which reduces noise by up to 97% compared to previous models. LDO Regulators are high-performance components typically used in precision medical devices and 5G communication equipment. They help stabilize battery voltage and effectively suppress noise, resulting in cleaner, purer sound.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe 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 minimizes signal loss, enabling the delivery of a more refined and detailed sound.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv class=\"rte text--pull\"\u003e\n\u003cp\u003eThe SP4000 is equipped with a precision-engineered Shield Can to block various types of noise and electromagnetic interference that could affect the audio block. For the first time in Astell\u0026amp;Kern's lineup, a 99.9% pure copper Shield Can is used—providing not only exceptional shielding performance but also delivering sound that is clearer and more distinct than ever before.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eAstell\u0026amp;Kern has overcome Android OS’s sampling limitation (SRC) through its proprietary customization technology, ADP (Astell\u0026amp;Kern Direct Path). This allows for bit-perfect, lossless playback even in streaming environments, ensuring the highest possible sound quality during music listening.\u003c\/p\u003e\n\u003cp\u003eIn response to the growing shift toward streaming-based music consumption, Astell\u0026amp;Kern has integrated full Android OS for the first time. The SP4000 not only delivers flagship-level audio quality but also offers enhanced convenience, marking its evolution into a highly refined next-generation digital audio player.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eThe SP4000 introduces Advanced DAR, Astell\u0026amp;Kern’s second-generation DAR (Digital Audio Remaster) technology, delivering sound that is even more natural and refined. Rather than sending the audio file directly to the DAR engine, the SP4000 first uses VSE (Virtual Sound Extender) to virtually restore lost harmonics, enhancing the sound quality at the initial stage.\u003c\/p\u003e\n\u003cp\u003eThen, the advanced DAR engine performs a second-stage upsampling process with greater precision and completeness. This two-step approach allows listeners to enjoy a deeper, more immersive sound that comes closer than ever to the original recording.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eA\u0026amp;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.\u003c\/p\u003e\n\u003cp\u003eFeaturing a high-performance CPU and improved 8GB of DDR4 memory, which is twice the amount commonly used, the more powerful system is stable with fast and fluid movement.\u003c\/p\u003e\n\u003cp\u003eThe 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). This maximizes the efficiency of the overall circuit configuration by providing more audio-only circuit space as well as reducing heat and noise from digital circuits.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eThe SP4000 features an upgraded UI that balances both functionality and emotional experience.The main screen includes an immersive animation where an LP appears to slide in and out as you swipe through albums—turning the act of choosing music into a visually engaging and tactile experience.\u003c\/p\u003e\n\u003cp\u003eThe interface retains Astell\u0026amp;Kern’s signature Crimson theme, reflecting the brand’s identity and capturing its distinct emotional sensibility in a refined, modern design.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eClean, angular lines echo the physical design of the device, seamlessly blending its identity into the screen for a striking, edge-defined aesthetic.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eDespite its wide range of features, the interface is designed to be intuitive and user-friendly. Graphics are kept simple and unobtrusive, allowing users to focus entirely on the current screen without distraction. Motion effects enhance emotional engagement and improve user interaction.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eTo achieve the goal of the A\u0026amp;ultima series, which is 'to provide the best value that no one can imitate while using the most innovative and uncompromising design and craftsmanship', the SP4000 uses 904L stainless steel material that has never been attempted before in a portable audio player. Using this material has expanded its value from just a digital device to the realm of a luxury good.\u003c\/p\u003e\n\u003cp\u003e904L stainless steel is harder and more difficult to process than general stainless steel requiring significantly more time and effort. However, due to its excellent durability and corrosion resistance, it has a characteristic that does not lose its beauty and is why it is used in expensive luxury watches where perfection in all materials and parts must be pursued with an irreplaceable and wonderful luster. Experience the uncompromising beauty and luxury of the SP4000 produced by Astell\u0026amp;Kern’s experienced craftsmanship.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eThe LED light surrounding the power button provides information on the Bit Depth of the currently playing song, and also adds a visually pleasing element by making it shine and stand out.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eCrossfeed mixes parts of the original signal from one channel and sends that signal to the opposite channel with a time difference to center the sound image. Through the use of detailed settings such as Shelf Cutoff, Shelf Gain, and Mixer Level, you can set the level of crossfeed according to your listening preferences.\u003c\/p\u003e\n\u003cp\u003eExperience the SP4000 more conveniently and comfortably with a wide 6-inch, large-screen 2180x1080 2K display.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eThe new AK File Drop function in the SP4000 makes files transfers easier and more convenient. Using AK File Drop, you can freely transfer files wirelessly through a PC, smartphone, or FTP program located on the same network. Music file management is now possible with a cableless, wireless solution.\u003c\/p\u003e\n\u003cp\u003eReplayGain for Automatic Volume Level Adjustment ReplayGain functionality, which adjusts audio sources with varying volume levels to a uniform loudness, has been implemented. Enjoy your personalized playlists with the ReplayGain feature.\u003cbr\u003e* ReplayGain supports up to 24bit\/192kHz audio sources.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eThe SP4000 supports Qualcomm QC 3.0 fast charging, so you can charge your DAP faster and more efficiently than previous models, reaching a full charge in about 4 hours.\u003c\/p\u003e\n\u003cp\u003eThe BT Sink function allows you to connect the SP4000 to an external device via Bluetooth, similar to connecting a smartphone to a BT speaker. Music being played on the external device can be transmitted to the SP4000 through the BT Sink function.\u003c\/p\u003e\n\u003cp\u003eThe SP4000 is packaged with a premium leather case crafted from Shrunken Calf by Perlinger, Germany’s world-renowned leather house. Founded in 1864 and spanning five generations of craftsmanship, Perlinger supplies the finest leather to luxury brands across the globe—blending time-honored tradition with modern techniques.\u003c\/p\u003e\n\u003cp\u003eThe Shrunken Calf leather used in the case is made from the soft, delicate hide of calves under one year old. It is processed using a chrome tanning method to preserve its natural texture, then uniquely shrunk using special agents—not heat—to retain its organic grain and wrinkles.\u003c\/p\u003e\n\u003cp\u003eFollowing an aniline dyeing process, Perlinger’s proprietary pigments are added to achieve a deep, vibrant color. Their advanced anti-aging treatment ensures that this richness lasts over time, complementing the SP4000 with a leather case that embodies lasting beauty, durability, and luxury.\u003c\/p\u003e\n\u003cp\u003eThe SP4000 stands at the pinnacle of Astell\u0026amp;Kern’s flagship A\u0026amp;ultima line—a DAP that embodies the peak of performance and design. Like the The force of light that pierces through the darkness, the rotating volume wheel generates energy that is visualized as shards breaking through a solid wall. This imagery is captured through sharp edges, restrained detailing, and geometric structures, expressing both explosive force and concentrated power. The interplay of contrasting surfaces and multidimensional forms goes beyond aesthetics, serving as a visual representation of the SP4000’s high-performance audio capabilities. Even the angle of the volume wheel's patterns has been meticulously crafted to deliver subtle tactile resistance, offering a sensory experience that connects users to the sound itself. It's not just about control—it’s an intuitive, emotional interaction with music.\u003c\/p\u003e\n\u003cp\u003eThe choice of materials in the SP4000 perfectly embodies both technology and emotion. The front features high-gloss polished 904L stainless steel, while the rear is finished with PVD-coated ceramic, offering exceptional craftsmanship in both form and function.\u003c\/p\u003e\n\u003cp\u003eThe SP4000 is more than just a digital audio player—it is a work of art where technology, design, intuition, and performance converge, expressing a pure passion for the ultimate sound experience.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eIN THE BOX:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eA\u0026amp;Ultima SP4000 DAP\u003c\/li\u003e\n\u003cli\u003ePremium German leather case\u003c\/li\u003e\n\u003cli\u003eUSB-C cable\u003c\/li\u003e\n\u003cli\u003eQuickstart guide\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eCRADLE:\u003c\/h3\u003e\n\u003cp\u003e\u003cmeta charset=\"UTF-8\"\u003e\u003cspan\u003eWhen paired with the AK Cradle, the Astell\u0026amp;Kern SP4000 and PD10 transform into the ultimate music source — delivering uncompromised performance at home. With Roon Ready and Qobuz Connect certification, plus open-Android support for downloading your favorite streaming apps, you gain limitless access to high-resolution music for your 2-channel home system.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003ePlacing the Astell\u0026amp;Kern DAP on the cradle instantly begins charging. When listening to music, the cradle provides a stable power supply when attached to an external USB power adapter, allowing you to stay immersed in your music for hours without worrying about battery life.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eThe XLR balanced outputs on the back of the cradle allows connection to a two-channel home audio system or directly to powered speakers. By connecting the DAP to speakers or amplifiers via the XLR output, you can enjoy the full high-resolution sound directly through your home audio system.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/div\u003e\n\u003ctable style=\"width: 100%; height: 931px;\" cellpadding=\"4\" cellspacing=\"0\" border=\"1\"\u003e\n\u003ccolgroup width=\"45%\"\u003e\u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 96.180556%; height: 19px;\" bgcolor=\"#D3D3D3\" colspan=\"2\"\u003e\u003cstrong\u003eSP4000 Specifications:\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 19px;\"\u003eModel\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 19px;\"\u003eSP4000 (PPF51)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 19px;\"\u003eBody Colour\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 19px;\"\u003eBlack, Silver\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 19px;\"\u003eBody Material\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 19px;\"\u003eStainless Steel 904L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 19px;\"\u003eDisplay\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 19px;\"\u003e6-inch 2K (2160 × 1080) touch screen\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 38px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 38px;\"\u003eSupported Audio Formats\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 38px;\"\u003eWAV, FLAC, WMA, MP3, OGG, APE, AAC, ALAC, AIFF, DFF, DSF\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 57px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 57px;\"\u003eSample Rate\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 57px;\"\u003ePCM: 8 kHz – 768 kHz (8\/16\/24\/32-bit)\u003cbr\u003eDSD Native: DSD64, DSD128, DSD256, DSD512 (Stereo)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 38px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 38px;\"\u003eOutput Level\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 38px;\"\u003eUnbalanced: 4.1 Vrms │ Balanced: 8.2 Vrms (no load)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 19px;\"\u003eCPU\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 19px;\"\u003eOcta-core\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 38px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 38px;\"\u003eDAC\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 38px;\"\u003eAKM4191 ×4 + AKM4499EX ×4 (Real Quad DAC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 19px;\"\u003eDecoding Support\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 19px;\"\u003eUp to 32-bit \/ 768 kHz Bit-to-Bit playback\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 19px;\"\u003eInput\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 19px;\"\u003eUSB Type-C (charging, PC \u0026amp; MAC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 38px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 38px;\"\u003eOutputs\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 38px;\"\u003eUnbalanced Out (3.5 mm), Optical Out (3.5 mm), Balanced Out (4.4 mm, 5-pole)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 19px;\"\u003eWi-Fi\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 19px;\"\u003e802.11 a\/b\/g\/n\/ac (2.4 \/ 5 GHz)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 38px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 38px;\"\u003eBluetooth\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 38px;\"\u003eV5.0 (A2DP, AVRCP, aptX HD, LDAC, LHDC, SBC, AAC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 38px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 38px;\"\u003eDimensions (W × H × D)\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 38px;\"\u003e85 mm × 149.8 mm × 19.5 mm (3.34\" × 5.89\" × 0.76\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 19px;\"\u003eWeight\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 19px;\"\u003eApprox. 615 g (21.7 oz)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 19px;\"\u003eFirmware\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 19px;\"\u003eUpgradeable via OTA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 19px;\"\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 19px;\"\u003e0℃ ~ 40℃ (32℉ ~ 104℉)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 76px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 76px;\"\u003eFrequency Response\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 76px;\"\u003e±0.006 dB (20 Hz – 20 kHz) Unbalanced │ Balanced\u003cbr\u003e±0.06 dB (20 Hz – 70 kHz) Unbalanced │ Balanced\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 38px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 38px;\"\u003eSignal-to-Noise Ratio (SNR)\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 38px;\"\u003e129 dB @ 1 kHz, Unbalanced │ 131 dB @ 1 kHz, Balanced\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 38px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 38px;\"\u003eCrosstalk\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 38px;\"\u003e-136 dB @ 1 kHz, Unbalanced │ -145 dB @ 1 kHz, Balanced\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 38px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 38px;\"\u003eTHD+N\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 38px;\"\u003e0.0005% @ 1 kHz, Unbalanced │ 0.0003% @ 1 kHz, Balanced\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 38px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 38px;\"\u003eIMD SMPTE\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 38px;\"\u003e0.0004% (800 Hz \/ 10 kHz, 4:1) Unbalanced │ Balanced\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 19px;\"\u003eOutput Impedance\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 19px;\"\u003e3.5 mm: 0.7 Ω │ 4.4 mm: 1.7 Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 19px;\"\u003eClock Jitter\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 19px;\"\u003e25 ps (Typ)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 19px;\"\u003eReference Clock Jitter\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 19px;\"\u003e200 Femto Seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 19px;\"\u003eBuilt-in Memory\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 19px;\"\u003e256 GB (NAND)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 19px;\"\u003eExternal Memory\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 19px;\"\u003emicroSD ×1 (up to 1.5 TB)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 19px;\"\u003eBattery Capacity\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 19px;\"\u003e6,780 mAh 3.8 V Li-Polymer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 19px;\"\u003eCharge Time\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 19px;\"\u003eApprox. 4 hours (QC3.0)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 38px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 38px;\"\u003ePlayback Time\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 38px;\"\u003eApprox. 10 hours (FLAC 16-bit 44.1 kHz, Vol.50, LCD Off)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19px;\"\u003e\n\u003ctd style=\"width: 43.107096%; height: 19px;\"\u003eSupported OS\u003c\/td\u003e\n\u003ctd style=\"width: 53.073459%; height: 19px;\"\u003eWindows 10\/11 (32\/64-bit), macOS X 10.7+\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Astell \u0026 Kern","offers":[{"title":"Silver","offer_id":46425243484401,"sku":"","price":5399.0,"currency_code":"CAD","in_stock":true},{"title":"Black","offer_id":46425243517169,"sku":"","price":5399.0,"currency_code":"CAD","in_stock":true},{"title":"Silver With Cradle","offer_id":47072609009905,"sku":null,"price":6038.0,"currency_code":"CAD","in_stock":true},{"title":"Black With Cradle","offer_id":47072609075441,"sku":null,"price":6038.0,"currency_code":"CAD","in_stock":true},{"title":"Copper","offer_id":47750725107953,"sku":null,"price":5699.0,"currency_code":"CAD","in_stock":true},{"title":"Copper With Cradle","offer_id":47750725271793,"sku":null,"price":6338.0,"currency_code":"CAD","in_stock":true},{"title":"SP4000T Silver","offer_id":48347562672369,"sku":null,"price":4620.0,"currency_code":"CAD","in_stock":true},{"title":"SP4000T With Cradle","offer_id":48347562705137,"sku":null,"price":5239.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0942\/5024\/files\/a_k-sp4000-black-noteworthyaudio-1000x.jpg?v=1750323739","url":"https:\/\/www.noteworthyaudio.com\/products\/astell-kern-sp4000-series-portable-music-player","provider":"Noteworthy Audio","version":"1.0","type":"link"}