Astell&Kern A&ultima SP4000 – High-End DAP with Octa DAC Architecture

The new benchmark in high-resolution portable digital audio players

The A&ultima SP4000 is Astell&Kern’s latest flagship DAP, engineered to deliver the highest level of audio performance ever achieved in a portable device. It marks a significant evolution over the previous SP3000, introducing the groundbreaking Octa Audio Circuit with a true Quad DAC configuration.

Each of the four AK4499EX DACs is paired with a dedicated AK4191EQ digital modulator, ensuring complete separation between digital and analog signal paths. This architecture significantly improves signal purity, harmonic reconstruction, and overall sound realism – even with the most demanding high-resolution files.

A 904L stainless steel chassis, 99.99% pure copper shielding, and a stunning Full HD 6” touchscreen complete this no-compromise audio machine, designed for those who demand the absolute best — anywhere, anytime.

Main Features

• DAC: 4x AK4499EX + 4x AK4191EQ (Octa DAC)
• Advanced audio circuit with ESA (Enhanced Signal Alignment) and High Driving Mode
• PCM up to 32bit / 768kHz and native DSD512 support
• Snapdragon 6125 octa-core CPU + full Android OS
• Proprietary technologies: Teraton Alpha, Advanced DAR, VSE, ADP
• 6” FHD touch display (2160x1080)
• 256GB internal memory + expandable via microSD up to 1.5TB
• Audio outputs: 3.5mm (also optical), 4.4mm balanced (5-pole)
• Output levels: 4.1 Vrms unbalanced – 8.2 Vrms balanced
• Bluetooth 5.0 with aptX HD, LDAC, LHDC
• Dual-band Wi-Fi 2.4/5GHz – DLNA supported
• USB DAC mode for PC/Mac via asynchronous USB
• Advanced features: Replay Gain, Crossfeed, AK File Drop, BT Sink
• Battery: 6780mAh – up to 10 hours playback – QC 3.0 fast charging
• 904L stainless steel chassis – available in Black or Silver
• Genuine German calf leather case included

Why choose the SP4000?

With the SP4000, Astell&Kern redefines the high-end portable audio player. It’s the brand’s first DAP with a full Android OS and support for third-party apps, with no quality compromise thanks to ADP (Astell&Kern Direct Path) technology.

The combination of high output power, refined digital processing, and premium mechanical design makes the SP4000 a true reference-grade source — ideal for headphone listening, desktop setups, or as a USB DAC.

Now available at Audio Impact in both Black and Silver finishes.

• ✔️ Try it in our Torino showroom
• ✔️ Secure & insured shipping across Italy and Europe
• ✔️ Expert support for setup and configuration