Astell&Kern A&ultima SP4000
#3 in Digital Audio Player · Rated 4.8
Flagship Android DAP with octa‑audio circuit and ESA tech
The SP4000 represents Astell&Kern’s flagship DAP, delivering audibly refined performance via an octa-audio circuit design, High Driving Mode, and ESA (Enhanced Signal Alignment) to minimize group delay for more coherent imaging. It runs full Android with Google Play access, enabling streaming apps while maintaining high-fidelity playback via independent analog/digital pathways. The build uses stainless steel and ceramic accents and ships with a premium leather case. In the marketplace, it stands as a top-tier portable source for those who want a compact desktop-like experience on the road, including Roon ARC and DLNA-friendly features. This model is aimed at discriminating listeners who demand studio-like accuracy in a portable package and are willing to invest in a device that doubles as a portable DAC and streaming hub.
Features
- Full Android OS with Google Play
- Octa-audio circuit design with ESA tech
- High Driving Mode for demanding headphones
- Two DAC paths with enhanced I/V design
- LDAC/aptX Adaptive wireless support
Pros
- Utterly reference-level sound for a DAP
- Versatile Android ecosystem and streaming apps
- Premium build quality with special finishes
Cons
- High price; bulky for pocket use
- Android OS introduces app management considerations