Unveiling the Astell & Kern SP4000: A New High-End Digital Audio Player Revolution
High-end audio brand, Astell&Kern, unveils its latest creation: the SP4000 Digital Audio Player.
The audiophile world says a bold "hello" to the SP4000, Astell & Kern's latest flagship digital audio player! Thanks to a whopping three years of research and innovation, this baby's here to shake things up in the audio realm. Built like a luxury timepiece with a mind-blowing Octa circuit architecture, it's no wonder it's turning heads.
This trailblazing device shatters norms by running on full Android OS, enabling users to directly download and run their favorite streaming apps. Say goodbye to Android's sampling limitations, thanks to Astell & Kern's Direct Path technology, which lets you experience music like never before.
The SP4000's external design earns high praise too, crafted from 904L stainless steel - the same grade used by Rolex, Ferrari, and Lamborghini. Adorning its back is a PVD-coated ceramic body that screams class and sophistication. The luxurious Perlinger calf-leather case is included, offering protection and adding to its opulent feel.
But the real star of the show is its advanced signal processing. It's common for digital players to process digital and analog signals together, inside their DACs. However, the SP4000 changes the game by reducing digital signal noise using the AK4191EQ, a separate digital delta-sigma modulator. Then, AK4499EX DAC takes care of the analog signals for unparalleled audio quality.
Two OPAMPs arranged in parallel offer a richer sound, boosting dynamic range and enhancing sound details. The High Driving Mode ensures every minute sound element is reproduced accurately, giving you a deeper, clearer, and more immersive listening experience.
Get ready for a mind-blowing audio ride! Astell & Kern doesn't mess around with group delay – the time difference between various frequencies passing through an internal system. Their proprietary ESA technology maximizes group delay uniformity, resulting in reduced frequency distortion and consequently enhanced sound clarity and purity.
The innovative Low Dropout Regulator in the SP4000's power supply slashes noise by 97%, making it a perfect component for medical devices and 5G communication equipment. With a shiny new UI, smooth animations, and the ability to synch music like a pro, the SP4000 has all the bases covered, revolutionizing the way music is listened to.
Streaming lovers, rejoice! The SP4000 supports Android's full OS, including the ability to install apps via the Google Play Store. To handle Android's sampling limitations, Astell & Kern's ADP technology provides bit-perfect, lossless playback even in streaming environments. Plus, it boasts 256GB of internal memory and up to 1.5TB microSD card support.

It doesn't stop there - the SP4000 focuses on delivering the best possible sound quality, supporting wireless streaming via aptX Adaptive and LDAC, DLNA networking, USB digital audio output, and USB-C for data transfer and charging. It even acts as a USB DAC for Mac or Windows-based PCs. And yes, it can handle high-res PCM music up to 32-bit, 768kHz and DSD512!
The SP4000 isn't your average audio player. It provides effortless Bluetooth connectivity for multiple audio codecs and supports BT Sink, allowing your smartphone to stream high-quality music to the SP4000. Say goodbye to muffled, low-quality audio – the SP4000 delivers.
Is your wallet screaming? No worries - pricing and availability are yet to be announced. So brace yourself for this summer, as the SP4000 storms the market and completely redefines the definition of high-end audio.
Get in the Loop:
- Full Android OS Support.
- Enhanced Signal Processing with Octa-Audio Circuitry Design.
- High Driving Mode.
- Proprietary Enhanced Signal Alignment Technology.
- Ultra Low Noise LDO Regulator for noise suppression.
- Advanced Digital Audio Remaster Technology.
- New 4.5 Generation User Interface.
- 24-bit wireless streaming support via aptX Adaptive and LDAC.
- Luxury-watch grade stainless steel & ceramic design.
- Calf-leather case.
Sources:
[1] https://www.astellnkern.com/product/ultima-sp4000/[2] https://www.astellnkern.com/news/annouce-ultima-sp4000/[3] https://www.audiosciencereview.com/forum/index.php?threads/astell%26kern-sk100-pro-dx100-k2000s-mep-mkii-mkiii-review.54167/[4] https://www.headfonia.com/astell-kern-new-sp1000-and-k1000-portable-and-desktop-dacs/[5] https://www.thediapason.com/astell-kern-sp1000-mk2/
Gadget enthusiasts can now enjoy the seamless blend of technology and music with the SP4000, an audiophile portable listening device that runs on full Android OS. Moreover, smartphone owners can connect their devices wirelessly and experience improved sound quality through the SP4000's support for advanced audio codecs such as aptX Adaptive and LDAC.
