Main Unit
| Name / Model No. | X7（FX7121） | Operating System | Deeply customized Android 4.4.4 |
| CPU Model | RK3188 | No. of Cores | 4 |
| CPU Operating Frequency | 1.4GHz | DAC | ES9018S |
| Keyboard | Virtual QWERTY keyboard | Input Method | Touchscreen |
| Special features | Dual Android / Pure Music operating modes, symmetrical remappable keys, separate interchangeable amp modules, USB DAC, docking connector, etc. | User Interface | Android 4.4.4 / FiiO Music |
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Connectivity |
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| WIFI | 2.4GHz IEEE802.11 b/g/n standards supported | Bluetooth | 2.4GHz Bluetooth V4.0 + EDR |
| USB | Micro USB2.0 | ||
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Display Screen |
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| Display Size | 3.97 inches | Number of Colours | 16.7 million colors |
| Display Type | IPS TFT | Viewable Angle | 178° |
| Resolution | 480×800 | Pixel Density | 233 ppi |
| Touchscreen | Tracks up to 5 simutaneous touch points | ||
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Sensors |
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| Light Sensor | Included | NFC | Not included |
| Accelerometer | Included | ||
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Storage |
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| RAM | 1GB | Total ROM | 32GB |
| Storage Expansion Type | Micro SD | ROM Available to User | About 27G |
| Maximum Storage Expansion | 256GB | ||
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Buttons and Ports |
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| Buttons | Side buttons + touchscreen | Custom Key Mapping | Supported (track and volume controls) |
| Headphone Out | Standard 3.5mm Headphone Port | Balanced Output | Supported (balanced amp module sold separately) |
| Line out / Coaxial Out | Standard 3.5mm Port (Shared line out / S/PDIF coaxial out) | USB Connection | Micro USB2.0 (charging / data transfer / docking function / USB DAC) |
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General |
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| Color | Titanium | Dimensions | 130 mm× 64 mm× 16.6 mm |
| Weight | 220g | Volume Control | 120 steps +/- button control (via analog-domain controller |
| Recommended headphone Impedance | 16~300 Ω (depending on fitted amp module) | Equalizer | 10-band EQ (±6dB), 8 presets+custom preset, ViPER Effect |
| Bass Boost | N/A | Treble Control | N/A |
| Balance Control | Max. 10 dB bias | Gain Control | Low / High |
| USB DAC | Up to 384kHz/32bit supported, DSD supported (driver installation required on computer) | ||
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Power Specifications |
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| USB Power Adapter | DC5V 2A recommended | Battery | Internal 3500 mAh Li-polymer battery |
| Charging Indication | Via LCD display and pulse LED | Battery Indication | Yes (Accurate battery % readings) |
| Charging Time | ＜4.5h (using USB 5V 2A charger) | ||
| Battery Life & Test Conditions | |||
| Headphone amplifier module AM1 ( Battery Life：≥ 9h) | |||
| Screen: OFF |
EQ: OFF |
Load: M3 open earbuds (27 Ω) | Volume: 55 |
| Gain | L | Test File | MP3, 44.1kHz/16bit (download link) |
| Headphone amplifier module AM2 ( Battery Life：≥ 8h) | |||
| Screen: OFF | EQ: OFF | Load: M3 open earbuds (27 Ω) | Volume: 52 |
| Gain | L | Test File | MP3, 44.1kHz/16bit (download link) |
| Headphone amplifier module AM5 ( Battery Life：≥ 6h) | |||
| Screen: OFF | EQ: OFF | Load: M3 open earbuds (27 Ω) | Volume: 54 |
| Gain | L | Test File | MP3, 44.1kHz/16bit (Download link) |
| Headphone amplifier module AM3 | |||
| Batter life | >6 h (3.5mm) | Load | M3 open earbuds (27 Ω) (3.5mm) |
| >6 h (2.5mm TRRS balanced) | SE846+Balanced cable (16Ω) (2.5mm TRRS balanced) | ||
| Volume | 58 (3.5mm) | EQ | OFF |
| 50 (2.5mm TRRS balanced) | Screen | OFF | |
| Gain | L | Test File | MP3, 44.1kHz/16bit (Download link) |
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Others |
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| Firmware upgrade | Supported both via zip file and OTA | Font Size | Changeable |
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Partial Performance Parameters for Line Output |
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| THD+N | ＜0.0007% (10 KΩ/1 kHz) | SNR | ≥115 dB (A-weighted) |
| Frequency Response | 10 Hz~62 kHz(-3dB) | Dynamic Range | >115 dB |
| Channel Separation | ＞100 dB (10 KΩ/1 kHz) | Line Level | >1.4 Vrms (10 KΩ/1 kHz) |
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Partial Performance Parameters 1 for Headphone Output (Specifications with AM1 headamp module (bundled low-gain module for sensitive headphones and IEMs; OPA1612+AD8397 amp+buffer. ±3.1V voltage supply, software gain)) |
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| Output Power 1 | >100 mW(32Ω/1 kHz) | Output Impedance | ＜0.5 Ω（32Ω load） |
| Output Power 2 | >200 mW(16Ω/1 kHz) | Channel Separation | ＞73 dB(32Ω/1 kHz) |
| Output Power 3 | >10 mW(300Ω/1 kHz) | THD+N | ＜0.0008% (32Ω/1 kHz) |
| Frequency Response | 10 Hz~76 kHz(-3dB) | Peak Output Voltage | ＞5.2 Vp-p |
| SNR | ≥115 dB (A-weighted) | Max. Output Current | ＞250 mA（For reference） |
| Drive Ability | 16~100Ω (Recommended) | ||
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Partial Performance Parameters 2 for Headphone Output (Specifications with AM2 headamp module (Medium-power type; MUSES02+BUF634 amp+buffer. ±7.5/5.3V voltage supply, hardware gain)) |
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| Output Power 1 | >300 mW(32Ω/1 kHz) | Output Impedance | ＜0.5Ω（32Ω load） |
| Output Power 2 | >350 mW(16Ω/1 kHz) | Channel Separation | ＞72 dB(32Ω/1 kHz) |
| Output Power 3 | >30 mW(300Ω/1 kHz) | THD+N | ＜0.001% (32Ω/1 kHz) |
| Frequency Response | 10 Hz~51 kHz(-3dB) | Peak Output Voltage | ＞8.8 Vp-p |
| SNR | ≥118 dB (A-weighted) | Max. Output Current | ＞250 mA（For reference） |
| Drive Ability | 16~150Ω (Recommended) | ||
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Partial Performance Parameters 3 for Headphone Output (Specifications with AM5 headamp module (High-power type; MUSES02+TPA6120A2 amp+buffer. ±9/5.3V voltage supply, hardware gain)) |
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| Output Power 1 | >500 mW(32Ω/1 kHz) | Output Impedance | ＜0.5Ω（32Ω load） |
| Output Power 2 | >800 mW(16Ω/1 kHz) | Channel Separation | ＞72 dB(32Ω/1 kHz) |
| Output Power 3 | >55mW(300Ω/1 kHz) | THD+N | ＜0.001% (32Ω/1 kHz) |
| Frequency Response | 9 Hz~84 kHz(-3dB) | Peak Output Voltage | ＞11 Vp-p |
| SNR | ≥120 dB (A-weighted) | Max. Output Current | ＞250 mA（For reference） |
| Drive Ability | 16~300Ω (Recommended) | ||
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Partial Performance Parameters 4 for Headphone Output (Specifications with AM3 headamp module (Balanced type; OPA1622*6 amp+buffer. ±5V voltage supply, software gain)) |
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| 3.5mm headphone output | |||
| Output Power 1 | ＞250mW(16Ω/1kHz) | Output Impedance | ＜0.3 Ω（32Ω load） |
| Output Power 2 | >190 mW(32Ω/1 kHz) | Channel Separation | ≥72dB (A-weighted) |
| Output Power 3 | >25 mW(300Ω/1 kHz) | THD+N | ＜0.001% (32Ω/1 kHz) |
| Frequency Response | 5 Hz~83 kHz (-3dB) | Peak Output Voltage | ＞7 Vp-p |
| SNR | ≥115dB (A-weighted) | Max. Output Current | ＞80 mA（For reference） |
| Drive Ability | 16~150Ω (Recommended) | ||
| 2.5mm TRRS balanced headphone output | |||
| Output Power 1 | ＞420mW(16Ω/1kHz) | Output Impedance | ＜0.3 Ω（32Ω load） |
| Output Power 2 | ＞540mW(32Ω/1kHz) | Channel Separation | ＞100 dB(32Ω/1 kHz) |
| Output Power 3 | ＞70mW(300Ω/1kHz) | THD+N | ＜0.0008% (32Ω/1 kHz) |
| Frequency Response | 5 Hz~83 kHz (-3dB) | Peak Output Voltage | ＞11 Vp-p |
| SNR | ≥115dB (A-weighted) | Max. Output Current | ＞160 mA（For reference） |
| Drive Ability | 16~300Ω (Recommended) | ||
| Audio Formats Supported | |||
| Lossless： |
DSD：DSD64/128（“.iso”、“.dsf”、“.dff”）
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| Lossy Compression： |
MP3、AAC、WMA、OGG... |
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Frequency Response diagram of curves.
Test condition：Gain=High， 0dB , Lineout(10k ohms loaded)
Red curve: Left channel , Blue curve: Right channel
Frequency Response diagram of curves. AM1
Test condition：Gain=High, VOL=MAX, Headphone output(33 ohms loaded)
Red curve: Left channel , Blue curve: Right channel
Frequency Response diagram of curves. AM2
Test condition：Gain=High, VOL=MAX, Headphone output(33 ohms loaded)
Red curve: Left channel , Blue curve: Right channel
Frequency Response diagram of curves. AM3
Test condition：Gain=High, VOL=MAX, 3.5mm Headphone output(33 ohms loaded)
Red curve: Left channel , Blue curve: Right channel
Frequency Response diagram of curves. AM3
Test condition：Gain=High, VOL=MAX, 2.5mm TRRS Balanced output( 33 ohms loaded)
Red curve: Left channel , Blue curve: Right channel
Frequency Response diagram of curves. AM5
Test condition：Gain=High, VOL=114, Headphone output(33 ohms loaded)
Red curve: Left channel , Blue curve: Right channel
