The Astell and Kern Aultima SP4000T utilizes four vacuum tubes along with high-resolution DACs designed to deliver the sound of warm analog music from lossless audio to audiophiles seeking a flagship digital audo player.

Body Material: Stainless Steel, Copper
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: 8kHz ~ 768kHz (8/16/24/32-bit); DSD Native: DSD64, DSD128, DSD256, DSD512
Output Level: Unbalanced 4.2Vrms, Balanced 8Vrms (No Load)
CPU: Octa-Core
DAC: AKM4191EQ ×2 + AKM4499EX ×2
Vacuum Tube: RAYTHEON JAN6418 ×4 (Quad Tube)
Decoding: Supports up to 32-bit / 768kHz Bit-to-Bit Playback
Input: USB Type-C (Charging, PC Mac Connection)
Outputs: 3.5mm Unbalanced / Optical Out, 4.4mm Balanced Out (5-pole only)
Wi-Fi: 802.11 a / b / g / n / ac / ax (2.4GHz / 5GHz)
Bluetooth: Bluetooth 5.2 (A2DP, AVRCP, aptX HD, LDAC, LHDC, SBC, AAC)
Dimensions (W × H × D): 85.7 × 150 × 19.5 mm (3.37 × 5.9 × 0.76 in)
Weight: Approx. 544g (19.5oz)
Feature Enhancements: OTA Firmware Upgrade Support
Operating Temperature: 0°C ~ +40°C (32°F ~ 104°F)
Storage Capacity
Built-in Memory
256GB [NAND]
External Memory
microSD x1 (Max. 1.5TB)
Battery
Capacity
7,450mAh 3.8V Li-Polymer
Charge Time
about 5hours (PD3.0 Charging)
Playback Time
about 10hours (Standard : FLAC, 16bit, 44.1kHz, Vol.80, LCD Off, Low Gain)