General Specifications

• Model/Number : X1 2nd gen / FX1221
• Headphone out (PO) : 3.5mm headphone output jack
• Color Available : Sliver/Black/Rose gold
• 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

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