Astell&Kern SP4000T Digital Audio Player (DAP)
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Product Overview & Specifications
The Astell&Kern SP4000T is a flagship portable digital audio player (DAP) designed to bridge the warmth of analogue sound with digital precision. As the first DAP to feature four Raytheon JAN6418 vacuum tubes, the SP4000T offers three distinct tube sound signatures (Triode, Ultra Linear, and Pentode) alongside a Triple Amplifier System that lets users toggle between Tube Amp, OP Amp, and Hybrid Amp modes. Built with a dual-DAC setup utilizing dual AKM AK4191EQ modulators and dual AKM AK4499EX DACs, it provides complete separation between digital and analogue signal paths for ultra-low noise performance.
Housed in a precision stainless steel and copper chassis with a multi-layer vibration isolation system, the SP4000T features a 6-inch 2K (2160 x 1080) touchscreen and runs on an open Android OS with Astell&Kern's Direct Path technology for bit-perfect streaming. Supporting PCM up to 32-bit/768kHz and native DSD512 decoding, it offers High Driving Mode for demanding headphones, Wi-Fi 6, Bluetooth 5.2 with LDAC/LHDC/aptX HD support, and balanced 4.4mm output. Each unit includes a handcrafted Italian vegetable-tanned leather case.
KEY FEATURES & PROPRIETARY TECHNOLOGIES
- Quad Raytheon JAN6418 Vacuum Tubes: Incorporates four vintage military-grade vacuum tubes to deliver natural analogue warmth, harmonic richness, and expansive soundstaging.
- Triple Tube Sound Modes: Select between Triode Mode (warm & rich), Ultra Linear Mode (balanced & detailed), or Pentode Mode (dynamic & energetic).
- Triple Amplifier System: Allows switching between Tube Amp Mode for pure analogue character, OP Amp Mode for maximum resolution, and Hybrid Amp Mode for blended precision.
- Dual AKM AK4191EQ + AK4499EX Architecture: Complete separation of digital processing and analogue conversion stages to minimize jitter and background noise.
- High Driving Mode & Advanced Damping: Delivers elevated voltage output (up to 8.0Vrms balanced) for hard-to-drive headphones while floating microphonic tube damping protects signal purity.
- Open Android Platform & Wireless Connectivity: Powered by an octa-core CPU running open Android with Wi-Fi 6, Bluetooth 5.2 (LDAC, LHDC, aptX HD), Roon Ready integration, and Qobuz Connect.
SPECIFICATIONS
| Specification | Detail |
|---|---|
| Product Category | Flagship Portable Hi-Res Digital Audio Player (DAP) |
| Brand / Model | Astell&Kern SP4000T (PPF52) |
| Chassis Construction | Stainless Steel & Copper Housing |
| Display | 6-inch 2K Touchscreen (2160 x 1080 Resolution) |
| CPU / Storage | Octa-Core CPU | 256GB NAND Flash Internal (microSD up to 1.5TB) |
| Operating System | Open Android OS with Bit-Perfect Direct Path |
| DAC Configuration | Dual AKM AK4191EQ Modulators + Dual AKM AK4499EX DACs |
| Vacuum Tubes | 4 x Raytheon JAN6418 Vacuum Tubes |
| Tube & Amp Modes | Tube Modes: Triode, Ultra Linear, Pentode Amp Modes: Tube AMP, OP AMP, Hybrid AMP |
| High-Res Audio Support | PCM up to 32-bit / 768kHz | Native DSD512 (22.4MHz) |
| Output Levels | Unbalanced: 4.2Vrms | Balanced: 8.0Vrms (Condition: No Load) |
| Signal-to-Noise Ratio (SNR) | Unbalanced: 124 dB | Balanced: 125 dB (@ 1kHz) |
| Crosstalk / THD+N | Crosstalk: -136dB (Unbal) / -145dB (Bal) | THD+N: 0.0006% (Unbal) / 0.0004% (Bal) |
| Output Impedance | 3.5mm Unbalanced: 0.7 Ω | 4.4mm Balanced: 1.7 Ω |
| Headphone / Digital Outputs | 1 x 3.5mm Unbalanced / Optical Out, 1 x 4.4mm Balanced (5-pole) |
| USB Interface | USB Type-C (Charging, Data Transfer, USB DAC Mode) |
| Wireless Connectivity | Wi-Fi 6 (802.11 ax, Dual-Band 2.4/5GHz) | Bluetooth 5.2 (LDAC, LHDC, aptX HD, AAC, SBC) |
| Battery Capacity & Playtime | 7,450mAh 3.8V Li-Polymer | Up to 10 Hours Playtime | USB PD 3.0 Fast Charge (~5 hours) |
| Dimensions & Weight | 85.7 x 150 x 19.5 mm | Approx. 544 g |
| Included Accessories | Handcrafted Italian Leather Case, USB Type-C Cable, Quick Start Guide |
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Astell&Kern SP4000T Digital Audio Player (DAP)
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