Description
The Astell & Kern SP4000 stands at the pinnacle of the A&ultima lineup—representing the highest expression of performance, engineering, and design in portable high-fidelity audio. More than a digital audio player, it is a fusion of technology and craftsmanship, created for listeners who demand absolute clarity, precision, and emotional engagement from their music.
Built from 904L stainless steel and paired with a premium shrunken calfskin leather case (Perlinger, Germany), the SP4000 reflects true luxury-grade construction while maintaining advanced acoustic integrity. A newly developed 99.9% pure copper Shield Can is engineered to reduce electromagnetic interference, ensuring cleaner signal pathways and improved audio purity.
At its core, the SP4000 introduces proprietary ESA (Enhanced Signal Alignment) technology, a breakthrough that reduces group delay by aligning frequency signals more uniformly. The result is dramatically improved clarity, reduced distortion, and a more natural, coherent sound presentation.
User experience is equally elevated through a 6-inch 2K (2180 × 1080) display, paired with A&K’s refined 4.5th-generation UI and full Android OS integration. Proprietary ADP technology bypasses Android’s SRC limitations, preserving bit-perfect audio playback for uncompromised sound quality.
Includes: SP4000 DAP, Leather Case, USB-C Cable, Quick Start Guide, and Owner's Manual.
Features:
- Enhanced Signal Processing Capabilities with Octa Audio Circuit Architecture
- Supports High Driving Mode For Delivering Premium Sound Quality
- Minimizes Group Delay with Proprietary ESA (Enhanced Signal Alignment) Technology
- Ultra Low Noise LDO Regulator For Top-Tier Noise Suppression
- Precision Sound Achieved with Any Layer Type PCB
- Equipped with a 99.9% Pure Copper Shield Can
- Large 6" Touchscreen, 2K Display (2160x1080 Resolution)
- Supports Full Android OS
- Advanced DAR Technology
- 4.5th Generation UI, Combining Functionality and Emotional Design
- Model: SP4000
Specifications:
- S/N: 129dB @ 1kHz, Unbalanced / 131dB @ 1kHz, Balanced
- Crosstalk: -136dB @ 1kHz, Unbalanced / -145dB @ 1kHz, Balanced
- Output Impedance: Unbalanced 3.5mm (0.7 ohm) / Balanced 4.4mm (1.7 ohm)
- DAC: AK4191EQ ×4 + AK4499EX ×4
- CPU: Octa-Core
- Input: USB Type-C (For Charging PC & MAC)
- Supported OS: Windows 10, 11 (32-/64-bit), MAC OS x 10.7
- Supported Audio Formats: WAV, FLAC, WMA, MP3, OGG, APE, AAC, ALAC, AIFF, DFF, DSF
- Outputs: 3.5mm Single-Ended / Optical, 4.4mm Balanced (Only 5-Pole Supported)
- Storage Capacity: 256GB Internal / External up to 1.5TB MicroSD (not included)
- Bluetooth: V5.0 (A2DP, AVRCP, Qualcomm® aptX™ HD, LDAC, LHDC, SBC, AAC)
- Wi-Fi: 802.11 a/b/g/n/ac
- Dimensions: 3.35"W × 5.90"H × 0.77"D
- Approx. Weight: 1.36 lbs.
- Color: Silver
