| Astell&Kern SP4000 Digital Audio Player Specifications | |
| Model | SP4000 (PPF51) |
| Display | 6-inch 2K (2160 × 1080) touch screen |
| Supported Audio Formats | WAV, FLAC, WMA, MP3, OGG, APE, AAC, ALAC, AIFF, DFF, DSF |
| Sample Rate | PCM: 8 kHz – 768 kHz (8/16/24/32-bit) DSD Native: DSD64, DSD128, DSD256, DSD512 (Stereo) |
| Output Level | Unbalanced: 4.1 Vrms │ Balanced: 8.2 Vrms (no load) |
| CPU | Octa-core |
| DAC | AKM4191 ×4 + AKM4499EX ×4 (Real Quad DAC) |
| Decoding Support | Up to 32-bit / 768 kHz Bit-to-Bit playback |
| Input | USB Type-C (charging, PC & MAC) |
| Outputs | Unbalanced Out (3.5 mm), Optical Out (3.5 mm), Balanced Out (4.4 mm, 5-pole) |
| Wi-Fi | 802.11 a/b/g/n/ac (2.4 / 5 GHz) |
| Bluetooth | V5.0 (A2DP, AVRCP, aptX HD, LDAC, LHDC, SBC, AAC) |
| Dimensions (W × H × D) | 85 mm × 149.8 mm × 19.5 mm (3.34" × 5.89" × 0.76") |
| Weight | Approx. 642 g |
| Firmware | Upgradeable via OTA |
| Operating Temperature | 0°C ~ 40°C (32°F ~ 104°F) |
| Frequency Response | ±0.006 dB (20 Hz – 20 kHz) Unbalanced │ Balanced ±0.06 dB (20 Hz – 70 kHz) Unbalanced │ Balanced |
| Signal-to-Noise Ratio (SNR) | 129 dB @ 1 kHz, Unbalanced │ 131 dB @ 1 kHz, Balanced |
| Crosstalk | -136 dB @ 1 kHz, Unbalanced │ -145 dB @ 1 kHz, Balanced |
| THD+N | 0.0005% @ 1 kHz, Unbalanced │ 0.0003% @ 1 kHz, Balanced |
| IMD SMPTE | 0.0004% (800 Hz / 10 kHz, 4:1) Unbalanced │ Balanced |
| Output Impedance | 3.5 mm: 0.7 Ω │ 4.4 mm: 1.7 Ω |
| Clock Jitter | 25 ps (Typ) |
| Reference Clock Jitter | 200 Femto Seconds |
| Built-in Memory | 256 GB (NAND) |
| External Memory | microSD ×1 (up to 1.5 TB) |
| Battery Capacity | 6,780 mAh 3.8 V Li-Polymer |
| Charge Time | Approx. 4 hours (QC3.0) |
| Playback Time | Approx. 10 hours (FLAC 16-bit 44.1 kHz, Vol.50, LCD Off) |
| Supported OS | Windows 10/11 (32/64-bit), macOS X 10.7+ |
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