Model name Astell & Kern A & ultima SP1000
recoding media Built-in capacity 256 GB (including system area) Expansion
slot microSD card slot × 1 slot (maximum 256 GB)
Number of main body recordable About 1,560 songs (FLAC / 192 KHz / 24 bits)
About 9,880 songs (FLAC / 44.1 KHz / 16 bits)
file format WAV, FLAC, MP3, WMA, OGG, APE, AAC, ALAC, AIFF, DFF, DSF
Sampling rate Native
DSD native: DSD64 (1 bit 2.8 MHz) stereo, DSD 128 (1 bit 5.6 MHz) stereo, DSD 256 (1 bit 5.6 MHz) stereo, PCM: 8 kHz, 16 kHz, 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz, 352.8 kHz, 1 bit 11.2 MHz) stereo
Number of quantization bits 8bit, 16bit, 24bit, 32bit (Float / Integer) ※ Native
bit rate FLAC: 0 to 8
APE: Fast to High
MP3 / WMA: Up to 320 kbps
OGG: Maximum Q 10
AAC: Up to 320 kbps
Folder Management ○
Tag information ID 3 V 1 Tag, ID 3 V 2 2.0, ID 3 V 2 3.0
Database management Music (All / MQS / DSD), by album, by artist, by genre
Resume function ○
Album Art ○
Lyric display ○
Playlist function ○
Playback method Normal play, Shuffle
Repeat mode Repeat, repeat 1 song
Equalizer function PRO EQ (fixed), user EQ (20 Band: 30 Hz to 18 KHz / Gain: ± 5.0 / Q value: 0.1 to 4.0)
D / A converter AKM (Asahi Kasei Electronics) AK4497 EQ × 2 (Dual DAC)
Input terminal USB Type-C terminal (charging · data transfer · USB-DAC)
Output terminal Earphone (unbalanced) output / optical digital output (3.5 mm), balanced output (2.5 mm / 4 pole), balanced output terminal for expansion unit
USB-DAC function 44.1 kHz to 384 kHz / 16 bits · 24 bit · 32 bit DSD 2.8 MHz · 5.6 MHz
Output level Unbalance 2.2 Vrms, Balance 3.9 Vrms (no load)
S / N ratio 120 dB (unbalanced) / 122 dB (balance) (1 kHz)
THD + N 0.0005% (unbalance) / 0.0008% (balance) (1 kHz)
Clock jitter 30 ps (typ)
Reference clock jitter 200 fs (VCXO Clock)
Physical key Rewind, Play / Pause, Fast Forward, Dial Volume (Power / Screen On / Off), Touch Sensor
Lock function Dial volume lock (It can be set from the notification bar pulled out from the upper part of the screen)
Volume adjustment 151 steps
Wifi IEEE 802.11 b / g / n (2.4 GHz)
Bluetooth
Ver. 4.1, A2DP / AVRCP, SBC / aptX HD
Supported OS Windows® 10 (32bit / 64bit), Windows 8 / 8.1 (32bit / 64bit), Windows 7 (32bit / 64bit), Mac OS X 10.7 or more
battery Built-in lithium polymer battery (3,700 mAh / 3.8 V)
Auto off function Auto power off (no operation), back light off (no operation), sleep timer
Charging method Charging only (when the power is off), charging & playing & data transfer
USB USB Type-C (Charge / Transfer)
Connection method MTP (media device) method
display 5.0-inch TFT color LCD (capacitive touch screen)
Resolution 720 × 1280 dots
size About 75.8 × about 132 × about 16.2 (mm)
weight Stainless steel: about 386 g
Copper: about 387 g