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General Specifications
Model/Number X1 2nd gen / FX1221 Headphone out (PO) 3.5mm headphone output jack
Color Available Sliver/Black/Rose gold/Red (limited edition) Headphone Impedance Range 16~100 Ω
Dimensions 97mm×55.5 mm×12 mm Volume control type 100 steps digital potentiometer
Weight 102 g Bass Boost N/A
Display Screen TFT 320×240 Treble N/A
Analog Audio Output Jack(LO) 3.5 mm headphone output jack Balance 5 dB
Digital Audio Output Jack N/A Gain Selection N/A
USB DAC N/A Equalizer 7-band equalizer (±6dB)
Chips used

SoC: JZ4760B ,   DAC: PCM5242,    LPF: OPA2322,    OP: ISL28291

Partial Performance Parameters for Line Output
THD+N ≤ 0.003% (1 kHz) SNR ≥115 dB  (A-weighted)
Frequency Response 5 Hz~60 kHz (-3dB) Dynamic range ≥107 dB
Crosstalk ≥ 101 dB (10 KΩ/1 kHz) Line output Level 1.7 Vrms (10 KΩ/1 kHz)
Partial Performance Parameters for Headphone Output
Output Power 1 > 100 mW (16 Ω/THD+N<1%) Output Impedance <1Ω(32Ω loaded)
Output Power 2 ≥ 70 mW (32 Ω/THD+N<1%) Crosstalk ≥72 dB (1 kHz)
Output Power 3 ≥ 8 mW (300 Ω/THD+N<1%) THD+N ≤ 0.003% (1 kHz)
Frequency Response 5 Hz~60 kHz (-3dB) MAX output voltage >4.0 Vp-p
SNR ≥113 dB (A-weighted) MAX output current >130 mA(For reference)
Power and Battery
Power Recommend DC5V 2A Battery Capacity 1800 mAh
Charge Display Red light indicates , green light turns on after fully charged Battery Display Yes
Battery Life >12 h Charging Time <3 h (DC5V 2A)
Battery Life Test Conditions
Screen

OFF

Load M3 open earbuds (27 Ω)
Volume 39 EQ OFF
Test File MP3 44.1kHz/16bit (Download link)
Audio Format Supported

Lossless:

APE(Fast):  192 kHz/24 bit;
APE(Normal):  96 kHz/24 bit;
APE (High): 96 kHz/24 bit;
FLAC: 192 kHz/24 bit;
WAV: 192 kHz/32 bit;
Aiff:192 kHz/32 bit;
Aif:192 kHz/24 bit;
WMA Lossless: to be supported by future update;
Apple Lossless: 192 kHz/24 bit;

 

Lossy compression:

MP3、AAC、WMA、OGG....

 

Frequency Response diagram of curves.
Test condition:play -5 dB sinusoidal signal, VOL=MAX,  Lineout(10kΩ loaded)
Blue curve: Left channel , Red curve: Right channel

 

Frequency Response diagram of curves.
Test condition:play -5 dB sinusoidal signal, VOL=MAX,Headphone output(33 ohms loaded)
Blue curve: Left channel , Red curve: Right channel

 

Distortion diagram of curves.

Test condition:play -5 dB sinusoidal signal,Line output

Distortion diagram of curves.

Test condition:play -5 dB sinusoidal signal,headphone output

 

 

 

 

 

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