FiiO M15 Smart Flagship High-Res Music Player [2nd hand]


2nd Hand

Second hand unit, in excellent conditions, 1 year warranty

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849,00 €

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Brand: FiiO


Flagship M15

Android Hi-Res Lossless Smart Portable Music Player

  • AK4499EQ*2 | AKM’s new flagship DAC
  • CSR8675 | Qualcomm’s flagship Bluetooth chip
  • XMOS USB chip | 768kHz/32bitDSD512
  • Samsung Exynos 7872 | Performance comparable to modern smartphones
  • 5.15 inch borderless | 720P Gorilla Glass screen
  • Four listening modes | Android/Pure Music/USB DAC/Bluetooth Decoding
  • Analog potentiometer volume knob | Pro audio-grade volume adjustment
  • NDK femtosecond crystal | Phase noise as low as -140dBc/Hz
  • 7490mAh battery | 15 hours play time21W fast charging
  • MQA 8x decoding | Full MQA support
  • 3rd-gen FGPA technology | More accurate clock, lower jitter
  • 2nd-gen All to DSD | More pleasant sound and lower power consumption
  • Wireless connectivity | FiiO Link/DLNA/AirPlay/WiFi transfer
  • Large internal storage and memory | 3GB RAM + 64GB storage + 2T expansion
  • Customizable multifunction key | Unlimited possibilities with just one click
  • New upgraded accessories | North American Black Walnut wood box

No nonsense, all high performance

Dual AK4499EQ flagship DACs

The AK4499EQ is AKM’s flagship third generation DAC. With four channels per DAC chip, a current output architecture, and being manufactured on the LSI special process, the AK4499 has impressive performance. The DAC chip is capable of decoding up to 768kHz sampling rate and native DSD12, and has a signal-to-noise ratio up to 140dB and THD+N as low as -124dB.

XMOS XUF208 USB chip

Supports up to 768kHz/32bitDSD512

When in USB DAC mode, the M15 utilizes professional grade XMOS XUF208 USB chip, supporting up to 768kHz/32 bit and DSD512 input.

Qualcomm CSR8675 Bluetooth chip

Supports two-way LDAC lossless Bluetooth

When the M15 is used as a Bluetooth receiver, Qualcomm’s CSR8675 flagship Bluetooth chip comes into play for complete Bluetooth audio format support as well as enabling lower latency and faster transfer speeds.

Bluetooth transmission formatsSBC, aptX, aptX-HD, LDAC, HWA

Bluetooth reception formatsSBC, AAC, aptX, aptX-LL, aptX-HD, LDAC

Exynos 7872 processor

Unrivalled processing power

· Dual A73 cores + Quad A53 cores

· 3GB RAM + 64GB storage + 2TB expansion

· Supports 2.4/5GHz dual-band WiFi

FiiO 3rd gen FGPA

Present in the M15 is FiiO’s self-developed 3rd generation FGPA with more advanced algorithms, more accurate clocks, and even further reduced jitter.

NDK femtosecond crystal

The two custom Japanese NDK femtosecond crystals in the M15 allow for a phase noise as low as -140dBc/Hz @ 1kHz offset. These crystals work in conjunction with the 3rd gen FPGA clock algorithm, for lower jitter and ultimately a more accurate clock for the DAC.


Parts worthy of a flagship

Ultra-low noise resistorshigh precision 0.1% tolerance, low temperature drift, low noise film resistors

Dedicated audio capacitors4 low-loss polymer tantalum capacitors + 4 Panasonic electrodeless film capacitors + 8 small film capacitors

Ample power reserves28 220uF low-loss polymer capacitors, 5 100uF high-voltage capacitors

Impressive LPF configurationEight 4-way independent Panasonic metallized film capacitors

Technologically rivals the best smartphones

· 8-layer ultra-thick immersion gold PCB

Greatly improves space utilization, and ensures no interference between digital and analog circuits

· Independent shielding for digital and analog circuits + special absorbant material

For further improved shielding against interference, and pro-grade material specifically to absorb 2.4GHz waves further helps

· Customized thermally conductive silicone, graphene, and copper-nickel-zinc alloy heatsinks

Effectively conducts internally-generated heat to the outer body, which allows the heat to dissipate into the air

Sharply dressed and well-equipped inside and out

The M15 adopts a fully balanced architecture to ensure every last detail can be heard without sacrificing bold dynamics. Inside this balanced architecture are: 2 all-new high-precision, low-noise, low temperature drift TI OPA2211 op-amps for the low-pass filter, 4 OPA1612 for IV conversion, and 1 OPA1622 for amplification of each channel.

Handle it all with active servo power technology

For the first time, FiiO has implemented “active servo power” technology to the final amplification stage, which allows the power output to change depending on the user’s preferred settings. When paired with IEMS, you can set the M15 to be optimized for minimal noise as possible. But if you want to use your hard-to-drive 300 ohm headphones, you can enable Big Driver mode to turn your M15 into a power monster capable of pushing such headphones to their limits.

Monstrous power output comparable to desktop amps

Under a 32-ohm loadsingle-ended output power is 490mW and balanced output power up to 800mW

Under a 300-ohm loadsingle-ended output power is 70mW and balanced output power up to 275mW

A quiet listening background as black as the universe

Noise floor as low as 2.1μV

Distortion as low as 0.0004%

S/N Ratio up to 122dB


Analog potentiometer volume knob

Pro-audio grade volume adjustment

ADC curve reconstruction as employed in the M15’s volume adjustment solves problem traditionally associated with analog potentiometers, such as volume imbalance between the left and right channels.

The brightness of the pulsar light can be also adjusted with the volume knob, making each turn of the knob both a visual and auditory delight.

15 hours battery life1800 hours standby time

7490mAh high energy density lithium cobalt oxide battery

Custom FPC and Japanese SMK battery connector

Supports QC2.0, MTK PE, and USB PD fast charging


5th gen classic columnar design

Arched design for a comfortable grip

The M15 represents the 5th generation of the basic classic columnar design that defined FiiO’s previous models, such as the Q1 Mark II/K3/K5 Pro. The left and right sides are made concave to facilitate gripping the device, and the overall arced design gives the M15 totally unified design.


Corning Gorilla Glass

5.15 inch/18:9 borderless screen

16.7 million colors

86.0% screen-to-body ratio

Oleophobic anti-fingerprint nanolayer


Every side is a beautiful side

· PET coated, carbon fiber textured back cover

· 2.5mm/3.5mm/4.4mm headphone outputs

· Concentric round analog potentiometer volume knob


A do-it-all button

Customizable multifunction key

一 Add to favorites with just one click

一 Shuffle to the next track with just one click

一 Delete the song currently playing with just one click

一 Switch filters with just one click

一 Change EQ with just one click

一 Enter USB DAC mode with just one click

一 Enter Bluetooth decoding mode with just one click



A breath of fresh air with high quality music

· 2nd gen global All to DSD functionality with significantly reduced power consumption

When All to DSD is turned on, the various kinds of harmonic distortion in music are more uniformly distributed for a more comfortable and fatigue-free experience.

· Supports MQA 8x decoding

The M15 supports decoding MQA tracks encoded in the 8x format for master-level sound quality, just as if you were actually in the recording studio.

M15 includes MQA technology, which enables you to play back MQA audio files and streams, delivering the sound of the original master recording. The green or blue dot next to MQA logo indicates that the unit is decoding and playing an MQA stream or file, and denotes provenance to ensure that the sound is identical to that of the source material. It glows blue to indicate it is playing an MQA Studio file, which has either been approved in the studio by the artist/producer or has been verified by the copyright owner


Not just a single-trick pony

Versatility in spades

· Supports DLNA, AirPlay, Wi-Fi music transfer

· Supports FiiO Link, allowing any smartphone to control the M15

· One click to display the track currently playing

· Karaoke playlist management

· Double-tap to wake

· Three finger screenshot

The king of different modes

Whether online or local playback, wired or wireless audio, Bluetooth or Wi-Fi music, Bluetooth transmission or reception, USB output or USB decoding - the M15 can easily switch between all of these playback modes any time you want, and provide you an excellent experience in all modes.  


Full digital audio format support

Finding new joy in music


Office desktopPaired with the DK1 base/USB audio output to external DAC

Home audio: Acts as a music source for your home setup

TravellingActs as a USB DAC with your computer

In the carTurn on car mode for lossless music on the road

When going outCan be paired with a smartphone, EH3 NC, or EW1

Exceptional packaging for an extraordinary device

North American Black Walnut wood box

The collectible North American Black Walnut wood box the M15 comes in give the player a flair befitting of its status. And to ensure your M15 looks pristine for years to come, included are tempered glass screen protectors.


  • CPUExynos 7872
  • DAC ChipAK4499EQ*2
  • Supported rates768kHz-32bitDSD512 native
  • USBType C USB2.0
  • Screen5.15 inch 1440×720 borderless 10-point touch display
  • Dimensions134mm×75mm×18mm (excluding volume knob)
  • Weightapprox. 310g
  • Charging time:<3.5h
  • Battery7490mAh high-voltage fast-charging lithium ion
  • Battery life15 hours
  • Output Power 1: 490mW (32Ω/single-ended/big driver mode)
  • Output Power 2: 70mW (300Ω/single-ended/big driver mode)
  • Output Power 3: 800mW32Ω/balanced/big driver mode
  • Output Power 4: 280mW300Ω/balanced/big driver mode
  • Frequency Response: 20Hz~90kHz-3dB
  • Signal to Noise Ratio: 122dBA-weighted
  • Noise FloorPO2.1μV(A-weighted); BAL4μV(A-weighted)
  • Output Impedance: 1.1Ω(32Ω load
  • THD+N: 0.0004%1kHz/10kΩ)


FiiO logo

About FiiO Electronics Technology Co., Ltd.

01 Brand Introduction - HiFi+Fashion

FiiO Electronics Technology Co., Ltd. was established in 2007.  It is a high-tech enterprise that combines research, development, production and sales, and its sales are mainly based on its own FiiO brand as opposed to OEM/ODM.  It focuses on digital audio, with current mainstay products being portable headphone amplifiers, DAC / amps and portable digital audio players.

FiiO: It is composed of Fi (Fidelity) from HiFi and iO (represents number 1 and 0) which indicates the sincerer feeling and more convenient life the digital tech has brought to us.

飞傲: The Chinese transliteration of FiiO, as well as representing youthful vigor and the active & innovative spirit of the company.

Audio products are meant to fulfill the spiritual pleasure of users.

  1. FiiO provides products and service related to music.
  2. We also hope to bring happiness to our users with the provided products and service, which is also the key value of FiiO.

Customer Service

  1. Good after-sales service, more reliable
  2. Great user experience, more pleasure
  3. Variety of activities, more involved

About products

  1. Affordable: FiiO products are well-known for its feature of high cost-performance. Lowering the entry level to make more customers can afford.
  2. Easy to use: FiiO pays great attention to the user experience. We are not only provide products with high quality, but also easy to use and with long lasting durability.
  3. More accessories bring more fun: Enable to play in a variety way and use under more possible environments.
  4. Updates available: Equipped with a variety of ports, it makes the music players can still connect to external amp/DAC for upgraded enjoyment.
  5. Endless transformability available: With replaceable amp module and expandable storage, the X7 can bring more playability.

02 Company Profile

Research & Development Team

  • Twenty years of R&D experience in audio products
  • Former core R&D team for audio products from OPPO
  • A team of 20 professional R&D engineers in software, hardware, industrial design, structure and electro-acoustic.

Research & Development Investment

FiiO keeps bringing in advanced equipments and high-tech talents so as to ensure the stable growth and long term competitive edge. Up till now, the team size has expanded three times than that of 2007 when we established.

Team Composition

The R&D team is made up of development dep, engineering dep and QC dep, with 60+engineers in total.

Authorized certifications

FC, CE, KC, CCC and ISO9001:2008 ensure the safety and quality of the products.

Production management

FiiO has strict requirements to production with almost “zero tolerance” even to small problems, which is strictly in compliance with the International Quality Management System ISO9001. 

QC Equipment 

  • a. AP audio analyzer (valued at 200,000RMB).
  • b. Life-span test platform against high & low temperature, swing and plug & unplug trial.
  • Aging test carriage towards mass production.
  • Aging test machine under high & low temperature.

Customer oriented

Driven by customers’ needs, we innovate constantly and response promptly to the market changes. We develop new products based on customers’ needs and compete for more market shares.

Company culture - Our Vision

Present the world a better “Made in China”.

Brand Spirit

  • Innovation

the earliest company that designed the minimum volume headphone amplifier. First dockable amp & DAC product. First amp specially designed for iPod/iPhone. First amp with adjustable power supply and power supplied by mobile phone battery. First multifunctional headphone amp & DAC for Android smarphone. First Hi-Res music player at a price lower than 1000RMB supporting 192K music. First Android-based Hi-res music player. 

  • Quality

Repair Rate < 1%. Sound Quality Control system. Original components imported from TI, Wolfson, Maxim. Company-wide quality control. +20 quality engineers and inspectors. Complete testing facilities. 

  • Service

CEO at the frontline of customer service. 100% response to enquiries. The most popular headphone amplifier brand on Head-Fi. First class website and contents in the audio industry. Interaction with and support to customers on Facebook and Microblog (twitter-like social website).

Brand Mission

FiiO designs, produces and sells high-quality products at favorable prices to those who love music and style.

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FiiO M15 Smart Flagship High-Res Music Player [2nd hand]

Second hand unit, in excellent conditions, 1 year warranty

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