Astell&Kern A&Ultima SP4000T Digital Audio Player

Industry-first DAP with MIL-Spec Vintage Vacuum Tube Raytheon JAN6418 in Quad Configuration
Industry-first DAP with Triple Tube Mode (Triode, Ultra Linear, Pentode)
T Series Signature feature: Triple AMP System
Adjustable Tube Current with Three Levels
High Driving Mode, ESA, and Advanced DAR for superior sound quality
Full Open Android
Enhanced Octa-Core CPU


Specification
General Specifications
Model
SP4000T (PPF52)
Body Color :Silver, Copper
Body Material : Stainless Steel, Copper
Display : 6inch 2K (2160 x 1080) touch screen
Supported Audio Formats : WAV, FLAC, WMA, MP3, OGG, APE, AAC, ALAC, AIFF, DFF, DSF
Sample rate :
PCM : 8kHz ~ 768kHz (8/16/24/32bits per Sample)
DSD Native: DSD64(1bit 2.8MHz), Stereo / DSD128(1bit 5.6MHz), Stereo
DSD256(1bit 11.2MHz), Stereo / DSD512(1bit 22.4MHz), Stereo
Output Level : Unbalanced 4.2Vrms │ Balanced 8Vrms (Condition No Load)
CPU : OCTA-Core
DAC : AKM4191EQ x2 + AKM4499EX x2
Vacuum Tube : RAYTHEON JAN6418 x4 (Quad Tube)
Decoding : Support up to 32bit / 768kHz Bit to Bit playback
Input : USB Type-C input (for charging & PC & MAC)
Outputs :
Unbalanced Out (3.5mm), Optical Out(3.5mm)
Balanced Out (4.4m, only 5-pole supported)
Wi-Fi : 802.11 a/b/g/n/ac/ax (2.4/5GHz)
Bluetooth : V5.2 (A2DP, AVRCP, Qualcomm aptX HD, LDAC, LHDC, SBC, AAC)
Dimensions : 3.37” (85.7mm)[W] x 5.9” (150mm)[H] x 0.76” (19.5mm)[D]
Weight : About 19.9oz(565g)
Feature Enhancements : Firmware upgrade supported (OTA)
Operating Temperature : 0℃ ~ + 40℃ (32℉~ 104℉)


Audio Specifications
Frequency Response
±0.006dB (Condition : 20Hz~20kHz) Unbalanced │ ±0.006dB (Condition : 20Hz~20kHz) Balanced
±0.06dB (Condition : 20Hz~70kHz) Unbalanced │ ±0.06dB (Condition : 20Hz~70kHz) Balanced
S/N : 124dB @ 1kHz, Unbalanced │ 125dB @ 1kHz, Balanced
Crosstalk : -136dB @ 1kHz, Unbalanced │ -145dB @ 1kHz, Balanced
THD+N : 0.0006% @ 1kHz, Unbalanced │ 0.0004% @ 1kHz, Balanced
IMD SMPTE : 0.0004% 800Hz 10kHz (4:1) Unbalanced │Balanced
Output Impedance : Unbalanced Out 3.5mm (0.7ohm) │ Balanced Out 4.4mm(1.7ohm)


Clock Source
Clock Jitter : 25pS (Typ)
Reference Clock Jitter : 200 Femto Seconds


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)
Supported OS : Windows 10,11(32/64bit) MAC OS X 10.7