| Main Unit | |||
| Name / Model No. | M9 | Operating System | Customized |
| CPU model | Exynos 7270 14nm | No. of cores | 2 |
| CPU operating frequency | 1GHz | DAC | AK4490EN×2 |
| Keyboard | Virtual QWERTY keyboard | Input method | Multi-touch screen |
| Special features | LDAC，HWA，Gesture operation，WiFi Streaming，RGB indicator for different formats，Bi-directional Bluetooth，8-layer HDI PCB | User interface | Customized/FiiO Music |
| Chips used | SoC: Samsung Exynos 7270，DAC：AK4490EN*2，FPGA：A3P030，LPF：OPA1612，BUF：OPA1622*2 Bluetooth chip：SAMSUNG S5N5C10B01-6330 |
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| Connectivity | |||
| WiFi | 2.4G，WiFi transmission supported | Bluetooth | 4.2 |
| USB | TYPE C Two-way USB2.0 | Bluetooth transmit | LDAC/aptX/aptX HD/SBC（Available when playing on M9 or using M9 as USB DAC） |
| HWA（LHDC） | Available when playing on M9 or using M9 as USB DAC | Bluetooth receive | SBC/LDAC (required to update to the latest firmware) |
| AirPlay | Supported (required to update to the latest firmware) | DLNA | Supports Windows for now, will support more in the future |
| FiiO Link | Supported (required to update to the latest firmware) | ||
| Display screen | |||
| Display size | 3.2 inches | Number of colours | 16M |
| Display type | LG IPS screen | Viewable angle | Full-view |
| Resolution | 480×800 | Pixel density(PPI) | 292 |
| Touchscreen | 5-finger multi-touch | ||
| Storage | |||
| RAM | 768MB | ROM | 4GB |
| Storage expansion type | Micro SD card | ROM available to user | 2GB |
| Maximum storage expansion | Theoretically 2TB (only one micro SD card slot) | ||
| Buttons and ports | |||
| Buttons | Physical button+Side volume scroll+Touch screen | Button customization | N/A |
| Headphone out (PO) | 3.5 mm headphone jack+2.5mm balanced headphone jack | USB | Two-way TYPE C USB2.0（Charging/Data transmisson/USB DAC/USB Audio） |
| Line out (LO) | 3.5 mm port（shared PO） | SPDIF output | 3.5mm port（shared PO） |
| General | |||
| Color | Black / Silver | Dimensions | 60mm*106mm*13.3mm |
| Weight | about 133g | Volume control | 120 steps +/- button control |
| Recommended headphone impedance | 16~300Ω | Equalizer | 10-band EQ (±6dB), 9 presets+custom preset |
| Treble control | N/A | Bass boost | N/A |
| Balance control | ±5dB | Gain control | L/H |
| USB DAC | Asynchronous 192kHz/32bit | USB Audio | DSD64/128，DoP/D2P |
| Power specifications | |||
| USB power adapter | DC 5V/2A recommended | Battery capacity | 2350mAh Li-polymer battery |
| Charging indication | Large charging icon shows on display when it's off, small charging icon shows on upper right of display when it's on | Charging time | ＜2h（DC5V/2A） |
| Battery indication | Yes (accurate battery % readings) | Deep sleep time | 45 days |
| Battery Life & Test Conditions | |||
| 3.5mm headphone output：＞10h | |||
| Volume | 46 | Load | M3 open earbuds (27 Ω) |
| Screen | OFF | Test File | MP3 44.1kHz/16bit |
| EQ | OFF | ||
| 2.5mm balanced output：＞9h | |||
| Volume | 48 | Load | M3 open earbuds (27 Ω) |
| Screen | OFF | Test File | MP3 44.1kHz/16bit |
| EQ | OFF | ||
| Bluetooth output：＞30h（SBC） | |||
| Volume | 60 | Load | BTR1+FH1 |
| Screen | OFF | Test File | MP3 44.1kHz/16bit |
| Others | |||
| Firmware Upgrade |
Supports both via zip file and OTA (*The product uses GPLv2 compliant firmware.) |
Font size | N/A |
| Firmware Upgrade | Supported | Third-party apps support | Can install whitelisted third-party music streaming apps |
| Line output specifications | |||
| THD+N | ＜0.002%（1kHz/10kΩ） | SNR | ≥117dB (A-weighted) |
| Frequency response | 5Hz~80 kHz（-3dB） | Noise floor | ＜5uV |
| Channel separation | ＞105dB | Line level | 2V |
| Headphone out specifications 1（3.5mm port） | |||
| Output power 1 | ≥125mW（16Ω / THD+N＜1%) | Output impedance | ＜2Ω |
| Output power 2 | ≥170mW（32Ω /THD+N＜1%) | THD+N | ＜0.002%（1kHz/32Ω） |
| Output power 3 | ≥19mW（300Ω / THD+N＜1%) | Separation | ＞72dB |
| Frequency response | 5Hz~80 kHz（-3dB） | Peak output voltage | 6.5Vp-p |
| SNR | ≥118dB (A-weighted) | Noise floor | ＜5uV |
| Headphone out specifications 2（2.5mm port） | |||
| Output power 1 | ≥125mW（16Ω / THD+N＜1%) | Output impedance | ＜2Ω |
| Output power 2 | ≥195mW（32Ω /THD+N＜1%，balanced turbo off) ≥220mW（32Ω /THD+N＜1%，balanced turbo on) |
THD+N | ＜0.002%（1kHz/32Ω） |
| Output power 3 | ≥24mW（300Ω / THD+N＜1%，balanced turbo off) ≥77mW（300Ω / THD+N＜1%，balanced turbo on) |
Separation | ＞98dB |
| Frequency response | 5Hz~80 kHz（-3dB） | Peak output voltage | 7.07Vp-p |
| SNR | ≥113dB (A-weighted) | Noise floor | ＜10uV |
| File format support | |||
| Lossless: | DSD：DSD64，128（iso”“.dsf”,“.dff”） APE(Fast): 192 kHz/24 bit APE(Normal): 192 kHz/24 bit APE (High): 192kHz/24 bit APE (Extra High): 48kHz/24 bit APE (Insane): 48kHz/24 bit FLAC: 192 kHz/24 bit WAV: 192 kHz/64 bit Aiff：192 kHz/24 bit Aif:192 kHz/24 bit WMA Lossless: 96 kHz/24 bit Apple Lossless: 192 kHz/24 bit |
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| Lossy compression: | MP3，OGG，WMA，AAC... | ||
Distortion curve 2
Test condition: Play -5 dB sinusoidal signal, 3.5mm line output (10kΩ loaded)
Frequency response curve 2
Test condition: Play -5 dB sinusoidal signal, 3.5mm line output (10kΩ loaded)
Blue curve: Left channel; Red curve: Right channel
Distortion curve 3
Test condition: Play -5 dB sinusoidal signal, 2.5mm TRRS balanced output (32Ω loaded)
Frequency response curve 3
Test condition: Play -5 dB sinusoidal signal, 2.5mm TRRS balanced output (32Ω loaded)
Blue curve: Left channel; Red curve: Right channel
