Home / Products / X5 3rd gen
Main Unit
Name / Model No. X5 3rd gen(FX5321) Operating System Deeply customized Android 5.1.1
CPU Model RK3188 No. of cores 4
CPU operating frequency 1.4GHz DAC AK4490
Keyboard Virtual QWERTY keyboard Input method Touchscreen
Special features Dual Android / Pure Music operating modes, symmetrical remappable keys,  USB DAC, docking connector, etc. User Interface Android 5.1.1 / FiiO Music
Chips used SoC: RK3188, DAC: AK4490x2,  LPF: OPA1642x2,  OP: Customized OPA426x2

Connectivity

WIFI 2.4GHz IEEE802.11 b/g/n standards supported Bluetooth Bluetooth V4.0,aptX supported
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 Yes    

Storage

RAM  1GB Total ROM 32GB
Storage expansion type Micro SD ROM available to user About 26G
Maximum storage expansion 512GB (256GB x 2)    

Buttons and ports

Buttons Side buttons + side volume wheel+ touchscreen Custom key mapping N/A
Headphone out 3.5mm standard headphone output jack Balanced output Supported (2.5mm balanced headphone jack)
Line out Standard 3.5mm port (shared LO/Coaxial out) USB connection Micro USB2.0 (charging / data transfer / docking function / USB DAC)
Digital Coaxial out Standard 3.5mm port(shared LO/Coaxial out)    

General

Color Titanium/Black/Red Dimensions 114.2 mm× 66.2 mm× 14.8 mm
Weight 186g Volume control 120 steps +/- button control (via analog-domain controller
Recommended headphone impedance 16~150 Ω Equalizer 10-band EQ (±6dB), 9 presets+custom preset, ViPER Effect
Bass boost N/A Treble boost N/A
Balance control 10 dB Gain control Low/High
USB DAC Up to 192kHz/24bit supported    

Power specifications

USB power adapter DC 12/1.5A, 9V/2A, 5V/2A recommended Battery  Internal 3400 mAh High-voltage quick charging Li-polymer battery
Charging indication via LCD display and pulse LED Charging time <2 h (DC 12V/1.5A)
<3 h (DC 5V/2A)
Battery indication Yes (accurate battery % readings)    
Battery Life & Test Conditions
3.5mm headphone output:>10 h
Volume 46 Gain High
Load M3 open earbuds (27 Ω) Screen OFF
Test File MP3 44.1kHz/16bit EQ OFF
2.5mm TRRS balanced headphone output:≥8 h
Volume 48 Gain High
Load 32Ω Screen OFF
Test File MP3 44.1kHz/16bit EQ OFF
Battery life test file download link click here to download    

Others

Firmware Upgrade supported both via zip file and OTA Font size Changeable
Third-party apps support No limit (recommended to install the apps listed on FiiO Market)    

Line output specifications

THD+N <0.0009% (1 kHz/10kΩ) SNR ≥120 dB (A-weighted)
Frequency response 5 Hz~55 kHz(-3dB) Dynamic range >117 dB
Channel separation >98 dB (1 kHz) Line level >1.8Vrms
Headphone out specifications (3.5mm headphone out jack)
Output power 1 ≥480 mW(16Ω / THD+N<1%) Output impedance <1Ω (32Ω loaded)
Output power 2 ≥250 mW(32Ω /THD+N<1%) Channel separation >73 dB (1 kHz)
Output power 3 ≥28 mW(300Ω / THD+N<1%) THD+N <0.003% (1 kHz)
Frequency response 5 Hz~55 kHz(-3dB) Peak output voltage >8 Vp-p
SNR ≥115 dB (A-weighted) Max. output current 250mA (For reference)
Balanced headphone out specifications (2.5mm TRRS headphone out jack)
Output power 1 ≥400 mW(16Ω / THD+N<1%) Output impedance <3Ω (32Ω loaded)
Output power 2 ≥240 mW(32Ω /THD+N<1%) Channel separation ≥98 dB (1 kHz)
Output power 3 ≥26 mW(300Ω / THD+N<1%) THD+N <0.003% (1 kHz)
Frequency response 5 Hz~55kHz(-3dB) Peak output voltage >7.5 Vp-p
SNR ≥111 dB (A-weighted) Max. output current >250 mA (For reference)
File format support
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/32bit(MAX)
WMA LOSSLESS:96kHz/24bit(MAX)

Lossy compression:

MP3, WMA, OGG...

 

 

Frequency Response diagram of curves  1.
Line out - Test condition: 10K ohms loaded, play -5 dB sinusoidal signal, Full volume , Lowpass filter mode=Steep
Red curve: Left channel , Blue curve: Right channel.

Frequency Response diagram of curves  2.

3.5mm headphone output - Test condition:  32 ohms loaded, play -5 dB sinusoidal signal, Full volume

Red curve: Left channel , Blue curve: Right channel.

Frequency Response diagram of curves  3.

2.5mm TRRS balanced output - Test condition: 32 ohms loaded, play -5 dB sinusoidal signal, Full volume , Lowpass filter mode=Steep

Red curve: Left channel , Blue curve: Right channel.

 

Distortion diagram of curves 1.

Line out - Test condition: play -5 dB sinusoidal signal

 

Distortion diagram of curves 2.

3.5mm TRRS headphone output - Test condition: play -5 dB sinusoidal signal

 

Distortion diagram of curves 3.

2.5mm TRRS balanced output - Test condition: play -5 dB sinusoidal signal

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