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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

Connectivity

WIFI 2.4GHz IEEE802.11 b/g/n standards supported Bluetooth 2.4GHz Bluetooth V4.0 + EDR
USB Micro USB2.0    

Display Screen

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    

Sensors

Light Sensor Included NFC Not included
Accelerometer Included    

Storage

RAM 1GB Total ROM 32GB
Storage Expansion Type Micro SD ROM Available to User About 27G
Maximum Storage Expansion 256GB    

Buttons and Ports

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)

General

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)    

Power Specifications

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)

Others

Firmware upgrade Supported both via zip file and OTA Font Size Changeable

Partial Performance Parameters for Line Output

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)

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))

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)    

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))

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)    

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))

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)    

Partial Performance Parameters 4 for Headphone Output 

(Specifications with AM3 headamp module (Balanced type; OPA1622*6 amp+buffer.  ±5V voltage supply, software gain))

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”)
DXD:352.8K
APE FAST/High/Normal:384kHz/24bit(MAX)
APE Extra High:192kHz/24bit(MAX)
APE Insane:48kHz/24bit(MAX)
Apple Lossless:384kHz/24bit(MAX)
AIFF:384kHz/24bit(MAX)
FLAC:384kHz/24bit(MAX)
WAV:384kHz/64bit(MAX)
WMA LOSSLESS:96kHz/24bit(MAX)

 

Lossy Compression:

MP3、AAC、WMA、OGG...

 

 

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

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