| General Specifications | ||||
| Model/Number | X3 Mark III/ FX3321 | Color Available | Red/Black | |
| Dimensions | 114mm×59 mm×12.8 mm | Weight | 126 g | |
| Headphone Impedance Range | 16~150 Ω | Volume control type | 120 steps digital potentiometer | |
| Display Screen | TFT 320×240 | Equalizer | 10-band equalizer (±6dB) | |
| Treble | N/A | Bass Boost | N/A | |
| Balance | 5 dB | Gain Selection | High/Low | |
| Headphone out (PO/LO/COAX Out) | 3.5mm headphone output jack | Analog Audio Output Jack(PO/LO/COAX Out) | 3.5mm headphone output jack | |
| Digital Coaxial Out (PO/LO/COAX Out) | 3.5mm headphone output jack | Balanced Output | Supported (2.5mm balanced headphone jack) | |
| USB DAC | Up to 192kHz/24bit supported | Bluetooth | Bluetooth V4.1 | |
| Chips used |
SoC: JZ4760B, DAC: PCM5242 *2, LPF: OPA2140, OP: OPA1622 |
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| Partial Performance Parameters for Line Output | ||||
| THD+N | ≤ 0.002% (1 kHz) | SNR | ≥113 dB (A-weighted) | |
| Frequency Response | 5 Hz~70 kHz (-3dB) | Dynamic range | ≥107 dB | |
| Crosstalk | ≥ 103 dB (10 KΩ/1 kHz) | Line output Level | 1.9 Vrms (10 KΩ/1 kHz) | |
| Partial Performance Parameters for Headphone Output | ||||
| Output Power 1 | > 120 mW (16 Ω/THD+N＜1%) | Output Impedance | ＜1.4Ω（32Ω loaded） | |
| Output Power 2 | ≥ 160 mW (32 Ω/THD+N＜1%) | Crosstalk | ≥69 dB (1 kHz) | |
| Output Power 3 | ≥ 15 mW (300 Ω/THD+N＜1%) | THD+N | ≤ 0.002% (1 kHz) | |
| Frequency Response | 5 Hz~70 kHz (-3dB) | MAX. output voltage | ＞6.5 Vp-p | |
| SNR | ≥112 dB (A-weighted) | MAX. output current | ＞145 mA（For reference） | |
| Balanced headphone out specifications (2.5mm TRRS headphone out jack) | ||||
| Output Power 1 | > 110 mW (16 Ω/THD+N＜1%) | Output Impedance | ＜1.2Ω（32Ω loaded） | |
| Output Power 2 | ≥ 190 mW (32 Ω/THD+N＜1%) | Crosstalk | ≥97 dB (1 kHz) | |
| Output Power 3 | ≥ 20 mW (300 Ω/THD+N＜1%) | THD+N | ≤ 0.003% (1 kHz) | |
| Frequency Response | 5 Hz~70 kHz (-3dB) | MAX. output voltage | ＞7.1 Vp-p | |
| SNR | ≥112 dB (A-weighted) | MAX. output current | ＞145 mA（For reference） | |
| Power and Battery | ||||
| Power | Recommend DC5V 2A | Battery Capacity | 2350 mAh | |
| Charge Display | Red light indicates , green light turns on after fully charged | Battery Display | Yes | |
| Charging Time | ＜3 h (DC5V 2A) | |||
| Battery Life Test Conditions | ||||
| 3.5mm headphone output：≥10 h | ||||
| Screen | OFF | Load | M3 open earbuds (27 Ω) | |
| Volume | 61 | EQ | OFF | |
| Test File | MP3 44.1kHz/16bit (Download link) | |||
| 2.5mm TRRS balanced headphone output：≥10 h | ||||
| Screen |
OFF |
Load | 32 Ω | |
| Volume | 59 | EQ | OFF | |
| Test File | MP3 44.1kHz/16bit (Download link) | |||
| Audio Format Supported | ||||
|
Lossless： DSD：DSD64（.iso, .dsf和.dff）
Lossy compression： MP3、WMA、OGG.... |
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Frequency Response diagram of curves 1.
Test condition：play -5 dB sinusoidal signal, Lineout(10kΩ loaded)
Blue curve: Left channel , Red curve: Right channel
Frequency Response diagram of curves 2.
Test condition：play -5 dB sinusoidal signal, VOL=MAX，Headphone output(33 ohms loaded)
Blue curve: Left channel , Red curve: Right channel
Frequency Response diagram of curves 3.
Test condition：play -5 dB sinusoidal signal, VOL=MAX，2.5mm TRRS balanced output
Blue curve: Left channel , Red curve: Right channel
Distortion diagram of curves 1.
Test condition：play -5 dB sinusoidal signal，Line output
Distortion diagram of curves 2.
Test condition：play -5 dB sinusoidal signal，headphone output
Distortion diagram of curves 3.
Test condition：play -5 dB sinusoidal signal，2.5mm TRRS balanced output
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