| 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 |
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| 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;
Lossy compression： MP3、AAC、WMA、OGG.... |
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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
