Astell&Kern SP4000 High Resolution Digital Audio Player (Black)

First Full Android Flagship with Bit-Perfect Playback - The first Astell&Kern player with native Android + Google Play support-no sideloading needed. Yet it maintains bit-perfect audio through AK’s exclusive Audio Direct Path (ADP) system. Quad-DAC with Octa-Circuit Architecture - A world-first in portable audio: four AK4191EQ digital processors and four AK4499EX DACs, each independently mapped, offering unmatched channel separation, ultra-low distortion, and 131 dB SNR. Parallel Amplifier Circuit (High Driving Mode) - Eight op-amps in a parallel configuration allow the SP4000 to unleash more current, driving high-impedance headphones or power-hungry IEMs with greater authority, stability, and headroom. Enhanced Signal Alignment (ESA) - Proprietary ESA technology synchronises timing across all frequency bands, eliminating group delay and delivering an incredibly cohesive, phase-correct soundstage. Advanced DAR + VSE Audio Remastering - The Digital Audio Remaster (DAR) engine, now paired with Virtual Sound Extension (VSE), upscales and restores lost spatial harmonics for analog-like musicality, especially with older or compressed recordings. Ultra-Low Noise Power Architecture - Featuring a low-noise LDO power regulator, developed for 5G and medical applications, it eliminates up to 97% of power-induced interference, ensuring an ultra-black background. Reference-Class Analogue Shielding - A 99.9% pure copper shield can encases the audio circuit to block EMI/RFI. Combined with Any-Layer HDI PCB design, this provides reference-grade noise isolation and signal purity. Ultra-Luxury Materials & Finishing - Machined from 904L stainless steel-used in Rolex watches-for exceptional durability and corrosion resistance. Comes with a Perlinger leather case and PVD ceramic back for wireless efficiency and heat dissipation. Gorgeous 6” 2K Display + LP-Inspired UI - A bold, ultra-bright 6” 2K LCD with a reworked UI featuring vinyl-inspired animations, multi-function side switch (including hold), and a redesigned volume wheel for tactile control. 10. Dual-Band Wi-Fi, LDAC, and Roon Ready - Streaming is fluid and audiophile-grade with dual-band Wi-Fi, LDAC/aptX HD Bluetooth, Roon Ready certification, and full app access via Android-making this a true all-in-one high-end audio source.