FiiO M6
James Tan 2019

FiiO M6 Review

Sound Impressions


To be honest, I don’t expect much from an entry-level device. In my opinion, what defines a good entry level player will be a smooth and friendly interface for a considerably large music collection and better noise control and power. Generally a better performance than your average phone. The M6 surprised me in that regard for its performance.

The M6 sounds quite controlled and dynamic out of the box with sensitive IEMs. Unlike some phones that output thick bass, harsh treble or V-shape signatures the resolution of the M6 is good for the price point though the treble is a bit shy. Instrumental separation is satisfactory for sparser tracks without complex arrangements or modern pop music.

Vocals are noticeably a bit warm with what seems to be a mid-range boost. On higher-end FiiO players, you will find more resolution and power but the M6 will probably make users jumping from phones to DAPs feel the difference, let alone phones with dedicated audio chipsets and optimizations.

Bluetooth Audio Performance

It’s more down to the earphones’ signature than the connection standard in this case. When the M6 is used as a receiver and set to HWA/LDAC it delivers a very similar presentation to M6’s wired sound.

FiiO M6


Testing was done with the M6 using the latest Fiio FA7, Brainwavz Koel, and the Final E3000 IEMs. For headphones, we chose the excellent Meze 99 Classics.

FiiO FA7

Pairing with FiiO’s higher-end end model FA7 it seems to require more power and control. The presentation was a little bit congested and the lower frequencies are emphasized. I assume the FA7 is tuned for higher-end devices or more powerful outputs. The M6 still sounds decent with the FA7 when you playback nicely mastered tracks or genres like Jazz that has fewer instruments in the mix and more bass texture

Brainwavz Koel

Brainwavz KOEL/Final E3000

With the KOEL it sounds fairly open to my ears and the Final E3000 sounded equally as good. With that slightly bass-boosted tuning, you will have the feeling the IEMs are quite well driven. The performance with lower impedance IEMs or single BAs is actually fairly respectable and I never got the impression I was missing any dynamic range or headroom in terms of power.

The M6 would be a good pick if you are looking for a back-up device or if you are new into this hobby, considering the very mature system and the safe tuning.

Meze 99 Classic

Meze 99 Classic

Testing with Meze 99, the M6 can push it quite loud. The output power is enough to give some decent body to the presentation, especially the low-end.

However, I did feel there would definitely be an upgrade in terms of dynamic range pairing the M6 with a portable amplifier using line-out mode or OTG to a small DAC/Amp/ FiiO’s own A5 with the M6 is a killer combination for power in that respect.

Select Comparisons

Apple iPod Nano Gen 7

This is the first device that comes to my mind when I powered up the M6. The long screen design allows you to read a few more lines and simply because of this reason I prefer such designs to squared screens.

The user experience is alike and with Android 7.0 equipped there are now way more options on the M6 such as streaming music, drag and drop files, and high-quality multiway Bluetooth connections.

I have been using the Gen7 for years and it has a cleaner and more linear tuning compared to the M6. However, the more mids focused sound signature on M6 makes the singer’s voice stands out more. You will also find a bit more resolution in M6’s output compared to the Gen 7 thanks to the newer chipsets.

Shanling M0

Shanling M0

The Shanling M0 has a similar form factor to the M6 also a similar price tag. Navigation is easier on the M6 with the larger screen and you don’t need to scroll down every time to look at the whole album when the screen is longer.

The sound on the M0 is flatter and cleaner while the M6 emphasizes the midbass. Singers with a darker voice fit the tuning on the Mo better due to the lighter body in its timbre. The resolution and power are similar for both devices. The M6 is a step up in terms of the user experience and streaming options unless all you want is a player to randomly play the playlist at gym.

FiiO M6

Our Verdict

The ease of entry into streaming on M6 makes this an ideal entry-level DAP for those who want music on the go and plenty of it. If you are new to the hobby or looking for something to new the M6 could possibly be the most modern first-time DAP out there.

We have seen many brands equipping their flagship devices with streaming features and higher-end Bluetooth options. However, it is very unexpected for Fiio to include these features on a DAP at this price point. I guess I should not be surprised given FiiO has always punched above the price points on most of their gear down through the years.

FiiO M6 Technical Specifications

Name / Model No. M6 Operating System Customized
CPU model Exynos 7270 14nm No. of cores 2
CPU operating frequency 1GHz DAC ES9018Q2C
Keyboard Virtual QWERTY keyboard Input method Multi-touch screen
Special features WiFi Streaming,LDAC/HWA/aptX/aptX HD/SBC Bluetooth support,Airplay with Apple devices,FiiO Link User interface Customized/FiiO Music
Chips used SoC: Samsung Exynos 7270 , DAC:ES9018Q2C,,Bluetooth chip:SAMSUNG S5N5C10B01-6330


WiFi 2.4G,WiFi transmission supported Bluetooth 4.2
USB TYPE C Two-way USB2.0 Bluetooth transmit LDAC/HWA/aptX/aptX HD/SBC (HWAAvailable when playing on M6, other codecs available when playing on M9 and using as USB DAC)
HWA(LHDC) Available when playing on M6 Bluetooth receive SBC/LDAC to be supported
AirPlay To be supported DLNA Supports Windows for now, will support more in the future
FLYLINK To be supported

Display screen

Display size 3.2 inches Number of colours 1600W
Display type LG IPS screen Viewable angle Full-view
Resolution 480×800 Pixel density(PPI) 292
Touchscreen 5-finger multi-touch


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 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 N/A


Color Black Dimensions 53.3mm×92.5mm×11.5mm
Weight about 83g 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 N/A
USB DAC Asynchronous 192kHz/32bit USB Audio DSD64/128,DoP/D2P

Power specifications

USB power adapter DC 5V/2A recommended Battery capacity 1600mAh 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 <2.5h(DC5V/2A)
Battery indication Yes (accurate battery % readings) Deep sleep time 26 days

Battery Life & Test Conditions

3.5mm headphone output:>13h
Volume 57 Load M3 open earbuds (27 Ω)
Screen OFF Test File MP3 44.1kHz/16bit
Bluetooth output:>15h(SBC)
Volume 120 Load BTR1+FH1
Screen OFF Test File MP3 44.1kHz/16bit
Firmware Upgrade Supports both via zip file and OTA Font size N/A
Firmware Upgrade Supported Third-party apps support Preinstalled:FiiO Music, Netease Music, MOOV, Tidal, KKBOX
APP whitelist:Spotify、Qobuz、Roon、Deezer,QQ Music、Xiami Music、JOOX、ES file manager、Himalaya (copy the apk file to Micro SD card or internal storage to install)

Line output specifications

THD+N <0.002%(1kHz/10kΩ) SNR ≥117dB (A-weighted)
Frequency response 10Hz~80 kHz(-3dB) Noise floor <3uV
Channel separation >112dB Line level 1.5V
Headphone out specifications 1(3.5mm port)
Output power 1 ≥110mW(16Ω / THD+N<1%) Output impedance <2Ω
Output power 2 ≥70mW(32Ω /THD+N<1%) THD+N <0.002%(1kHz/32Ω)
Output power 3 ≥7mW(300Ω / THD+N<1%) Separation >75dB
Frequency response 10Hz~80 kHz(-3dB) Peak output voltage 4.245Vp-p
SNR ≥118dB (A-weighted) Noise floor <3uV

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
(Extra High) APE: 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
Lossless: MP3,OGG,WMA,AAC…

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