M15S Portable Hi-Res Lossless Music Player

Desktop/portable dual power supplies | High-performance ES9038PRO DAC
QCC5124 with full Bluetooth format support | Qualcomm 660+Android 10
1200mW+1200mW continuous output power | DK3S dock included
Five gain levels| Six operating modes including Roon Ready

Pocket Desktop-Level Machine —— M15S

The “desktop/portable dual power supply modes” as featured on the portable desktop-grade player M17 and the portable desktop-grade amp Q7 have been well-received by the audiophile community, which is why we sought to put this technology on other products. Now, with the implementation of the dual power supply modes onto the M15 with its more ergonomic design, the M15S is the ideal combination of portability and high performance.

Flagship-level tech
A new chapter in the high-end

The new M15S starts a new chapter in the FiiO high-end, sharing the same technologies as the portable desktop-grade M17 player and the portable desktop-grade amp Q7 that give you desktop-level performance in a portable package – including desktop mode, dual power supply modes, and five gain levels.

Dedicated desktop mode Battery protection expert

When in the dedicated desktop mode and under USB fast charging, the M15S will transform essentially into a desktop device and work completely without the battery. That is, under this mode the battery will neither be charged nor discharged, preventing premature battery degradation.

Desktop/portable dual power supply modes
Robust performance everywhere

The M15S not only features the “desktop/portable dual power supplies” as seen in other FiiO products, it is also equipped with an automatic “auxiliary DC power supply” – the M15S is able to automatically recognize when fast charging* through USB is being used and automatically switches to use the highest-voltage power supply, leading to an increase of 26.67% in power supply for even more power output. Even when not using the fast-charging adapter, the M15S can still automatically switch to a higher-voltage power supply that is enough to drive most headphones.

*Activated as soon as it detects QC/PD fast charging through USB

26.67% Power supply increase
21.21% Power output increase

Five gain levels
Near-desktop power

The M15S can be adjusted with five levels of gain. Under battery power, low/medium/high/over-ear headphone gain levels can be selected. When under USB power, the enhanced over-ear headphone gain level is also available, enabling undistorted power output up to 1200mW per channel, easily enough to drive a wide variety of IEMs and headphones.

Six operating modes including Roon Ready

Pure Music mode: FiiO exclusive mode, for immersive music.
Android mode: Freely use third-party apps, including those of streaming services.
AirPlay mode: wirelessly connect to iOS devices like iPhone/iPad, with a sound quality boost.
Roon Ready mode: Roon Ready certified, for serious music lovers.
USB DAC mode: acts as a DAC when connected to a computer/phone, for greatly improved sound.
Bluetooth receiver mode: supports SBC, AAC, aptX, aptX HD, aptX LL, LDAC, and aptX Adaptive, for convenient quality wireless sound.

Overbuilt power supply
For ample clean power anytime

Fully separated digital power supply, effectively reducing crosstalk and interference. Multi-stage analog power supply, high-precision and low-noise for early signal processing. Multi-voltage servo power supply for headphone amp, capably driving low and high-impedance loads

High-performance ES9038PRO DAC
Desktop-grade part

The full, uncut desktop ES9038PRO DAC chip with eight independent D/A converters is employed in the M15S.Each channel uses four D/A converters in parallel to form a fully differential output, for a truly rich and highly resolving sound.

4th-gen FPGA+NDK femtosecond crystal
DAPS Digital Audio Purification System

Audio data is passed through a FiiO-developed 4th-gen FPGA with phase-locked loop technology, which works together with two custom Japanese NDK femtosecond crystal oscillators to provide a high-precision and low jitter unified clock source for the entire audio architecture. This is all done in the pursuit of purer sound.

Multi-stage audio circuit For faithful sound reproduction

The M15S features a multi-stage audio circuit complete with IV, LPF, gain adjustment and amplifier sections. High-precision and low-noise film resistor used ensures more accurate signal reproduction and channel balance. Within the LPF part of the circuit are Panasonic low-loss metalized film capacitors that guarantee extremely low harmonic and phase distortion.

Graphene heat dissipation technology
Cooling for consistent high-power output

Advanced and highly efficient heat dissipation design allows the M15S to maintain stable temperatures and continuously deliver high power output: Stainless steel battery compartment, to quickly dissipate battery heat;

Low temperature-drift and high-precision thin-film resistors and capacitors, that can stably cope with temperature swings;

A dedicated metal shield, graphene, and high thermal conductivity silica gel over hotspots for maximum heat dissipation.

Comprehensive shielding For truly “clean” sound

In order to shield from interference as much as possible, the M15S employs a nickel copper shield that shields the analog portion of the audio circuit as well as the main SoC to ensure the purity of the analog signals traveling through the circuit. In addition, stacked onto the main shield are other heat dissipation and shielding materials as well as wave-absorbing paper. The high-quality parts and carefully-considered shielding design all aim to ensure truly clean and highly-resolving sound.

Wireless HiFi taken to the next level
SBC/AAC/aptX/aptX HD/LDAC 2-way Bluetooth

The M15S wireless capabilities include AirPlay, DLNA streaming and transmission, as well as Bluetooth. Bluetooth is handled by the Qualcomm QCC5124 chip that has a proven track record in other FiiO products, allowing the M15S to capably handle 2-way Bluetooth.

Bluetooth 5.0 supported transmission: SBC, AAC, aptX, aptX HD, LDAC, LHDC

Bluetooth 5.0 supported reception: SBC, AAC, aptX, aptX HD, aptX LL, LDAC, aptX Adaptive

Knob/button volume adjustment
Reliable and easy to use

Volume on the M15S can be adjusted either with an analog potentiometer knob or with buttons, both easily allowing you to fine-tune through the 120 levels of volume the way you prefer.

Feel free to turn the volume knob to your heart’s content, as the integrated rotary encoder* is highly precise and des gned for minimal wear with each turn of the knob. Even if you accidentally drop the device, the encoder is securely fixed ensuring the continued reliability of the volume knob.

*The volume knob features RGB lights, which can be customized in brightness, color, and behavior under various device statuses. *Encoder rated durability＞30000 cycles (360° forward rotation+360° reverse rotation is 1 cycle)

Qualcomm 660+Android 10
A match made in heaven

With the stable and smooth combination of the Qualcomm Snapdragon 660 and Android 10, you can start listening quickly with the M15S.With the ability to freely install third-party apps and with no global SRC, you can be sure to listen to the music you want in the highest quality.

Elegantly constructed
Instantly mesmerizing

The M15S features a combination of classical timeless styling and modern technological touches that give it an elegant appearance that is enjoyable to use.

*3.5mm single-ended headphone output, with line out and coaxial out support
*4.4mm balanced headphone output, with balanced line out support

5.5-inch 720P HD display
5th gen classic columnar design
Rear diamond-cut texture
Recessed design on both ends
2.5mm balanced headphone output
3.5mm single-ended headphone output
4.4mm balanced headphone output

Long battery life For worry-free use

Despite its portable size, the M15S features a large 6200mAh battery that ensures all-day listening whether you are using single-ended or balanced output. Battery charge optimization and battery protection systems are there to ensure that the battery will last for a long time.

6200mAh Battery capacity
about 3.5h Charging time
QC3.0+PD Fast charging protocols
9h/10.5h Battery life

More safeguards
Fewer headaches

The overheat protection and battery protection systems are among the many safeguards that ensure the M15S can consistently maintain its high power output, letting you listen with fewer headaches.

Temperature protection: The M15S regulates itself to be within an optimal temperature range no matter the environmental conditions, including stopping battery charging if necessary.

Optimized battery charging: In desktop mode, the M15S can be used without going through the battery. When not in desktop mode, the M15S can be placed in an “optimized battery charging” mode that prevents the battery from being charged all the way to 100% to prevent premature battery degradation.

Rich functionality A true all-in-one

Second harmonic adjustment
Tailor to your listening preferences

Supports micro SD cards
Supports up to 2TB, support for firmware upgrades over micro SD

ALL TO DSD support
Lush and smooth sound right to your ears

FiiO Link functionality
Wireless control, instant adjustments

5G+2.4G dual-band Wi-Fi
Faster and more stable connections

Abundant accessories

M15S*1
Leather Case*1
DK3S heat dissipation dock*1
PD charging/data cable*1
USB power cable*1 (for heat dissipation dock power supply)
USB adapter*1
Quick start guide*1
Warranty card*1
Tip card*1
micro SD card removal pin*1
GPL manual*1

Specifications

General Specifications
Name / Model	M15S	Hardware	Soc: Snapdragon 660, DAC: ES9038PRO, Amplifier: OPA926 * 2, Crystal Oscillator: NDK Femtosecond Crystal Oscillator * 2
working mode	Android mode / Pure music mode / USB DAC mode / Bluetooth receiving mode / AirPlay mode / Roon Ready	Weight	about 345g
color	Black	Volume Control Type	button control or knob control
Size	about 140x80x18.9mm	Body Memory / User Free Space (ROM)	64GB / About 46GB
screen	5.5-Inch full-fit screen (resolution 1440 * 720)	Gain	Ultra high (Quick charge) / Super high / high / medium / low
RAM	4GB	Recommended headphone impedance	8 ~ 150Ω (single-ended output) / 8 ~ 350Ω (balanced output)
Storage expansion	Single TF card slot, up to 2TB (theoretically)	Channel balance	L20~ R20 (0.5dB per level)
Buttons and interfaces
Button	Physical key	USB	TYPE C USB3.0 (charging / data transmission)
Headphone output	3.5mm single-ended	Line output port	3.5 mm (shared with PO port)
Balanced output	2.5mm + 4.4mm balanced	Balanced line output interface	2.5mm balance + 4.4mm balance (shared with PO ports)
coaxial interface	3.5 mm (shared with PO port, up to 384kHz-32bit / DSD128)
Features
WiFi	2.4GHz / 5GHz, supports DLNA transmission and reception, AirPlay, WiFi transmission, Roon Ready, etc.	Bluetooth Transmitter (5.0)	SBC, AAC, aptX, aptX HD, LDAC, LHDC
Bluetooth reception (5.0)	SBC, AAC, aptX, aptX HD, aptX LL, LDAC, aptX Adaptive	FiiO Link	Android support WiFi and Bluetooth control, iOS support WIFI control
MQA	Global 8x decoding	All to DSD	support
Double click to wakeup	support	USB Audio	768kHz-32bit / DSD512 (DoP / D2P / Native)
Maximum supported sampling rate	Native: Up to 384kHz-32bit / DSD256	Car mode	can follow the car USB automatic switch machine
Maximum supported sampling rate	USB DAC up to 384kHz-32bit / DSD256	EQ	10-band dynamic EQ adjustment (± 12dB), built-in 8 preset EQ, support custom EQ
Power-off timer	Support power saving shutdown / sleep shutdown	Navigation control	Gesture control / 2-Bottom navigation / 3-Bottom navigation
Firmware Upgrade	Support local storage upgrade + TF card local upgrade + OTA push upgrade
Power Parameters
power supply	Support QC3.0, QC4.0 and PD2.0 and PD3.0 quick charge	Battery Capacity	6200mAh
charging time	About 3.5 hours (QC3.0 quick charge mode)	Standby Time	>1000h
Battery life and test conditions
3.5mm headphone output: 10.5 hours
Volume	40	Gain	super high
Screen status	Off	Tracks formats	MP3 44.1kHz / 16bit
EQ	Off	Load	32 Ω
2.5mm +4.4mm balanced output: 9 hours
Volume	29	Gain	super high
Screen status	Off	Play tracks and formats	MP3 44.1kHz / 16bit
EQ	Off	Load	32 Ω
Audio Parameters
PO output performance parameters (Ultra high)
Output power 1	L+R≥535mW+535mW(16Ω / THD+N<1%)	Output impedance	≤ 1.4 Ω(32 Ω)
Output power 2	L+R≥580mW+580mW(32Ω / THD+N<1%)	THD+N	≤ 0.0005%(1kHz / 32Ω)
Output power 3	L+R≥93mW+93mW(300Ω / THD+N<1%)	SNR	≥ 122.5dB(A weighted)
Crosstalk	≥ 80dB(1kHz / 32Ω)	Noise floor	≤ 3.2 μV(A weighted)
Frequency response	20Hz~20kHz(-0.15dB)	Peak output voltage	15.0 Vpp
Frequency response	20Hz~50kHz(-1.0dB)	Peak output voltage	15.0 Vpp
PO output performance parameters (Super high)
Output power 1	L+R≥475mW+475mW(16Ω / THD+N<1%)	Output impedance	≤ 1.4 Ω(32 Ω)
Output power 2	L+R≥395mW+395mW(32Ω / THD+N<1%)	THD+N	≤ 0.0005%(1kHz / 32Ω)
Output power 3	L+R≥57mW+57mW(300Ω / THD+N<1%)	SNR	≥ 121.0dB(A weighted)
Crosstalk	≥ 80dB(1kHz / 32Ω)	Noise floor	≤ 3.2 μV(A weighted)
Frequency response	20Hz~20kHz(-0.15dB)	Peak output voltage	11.7 Vpp
Frequency response	20Hz~50kHz(-1.0dB)
Line output performance parameters
THD+N	≤ 0.00034%(1kHz / 10kΩ)	SNR	≥ 124.0dB(A-weighted)
Crosstalk	≥ 106dB(1kHz / 10kΩ)	Noise floor	≤ 1.2 μV(A weighted)
Frequency response	20Hz~20kHz(-0.1dB)	Line Output Level	2.0Vrms(1kHz / 10kΩ)
Frequency response	20Hz~50kHz(-0.7dB)
Balanced headphone output performance parameters (Ultra high)
Output Power 1	L+R≥531mW+531mW(16Ω / THD+N<1%)	Output impedance	≤ 2.3 Ω(32 Ω)
Output Power 2	L+R≥1200mW+1200mW(32Ω / THD+N<1%)	THD+N	≤ 0.00075%(1kHz / 32 Ω)
Output Power 3	L+R≥368mW+368mW(300Ω / THD+N<1%)	SNR	≥ 121.5dB(A weight)
Degree of separation	≥105.0dB(1kHz / 32Ω)	Noise floor	≤ 5.2 μV(A weighting)
Frequency response	20Hz~20kHz(-0.15dB)	Peak output voltage	30.0Vpp
Frequency response	20Hz~50kHz(-1.0dB)
Balanced headphone output performance parameters (Super high)
Output Power 1	L+R≥531mW+531mW(16Ω / THD+N<1%)	Output impedance	≤ 2.3 Ω(32 Ω)
Output Power 2	L+R≥990mW+990mW(32Ω / THD+N<1%)	THD+N	≤ 0.00075%(1kHz / 32 Ω)
Output Power 3	L+R≥226mW+226mW(300Ω / THD+N<1%)	SNR	≥ 120.5dB(A weight)
Degree of separation	≥105.6dB(1kHz / 32Ω)	Noise floor	≤ 5.2 μV(A weighting)
Frequency response	20Hz~20kHz(-0.15dB)	Peak output voltage	23.7 Vpp
Frequency response	20Hz~50kHz(-1.0dB)
Balanced line output performance parameters
THD+N	≤ 0.00031%(1kHz / 10 kΩ)	SNR	≥ 127.7dB(A weight)
Crosstalk	≥ 106dB(1kHz / 10 kΩ)	Noise floor	≤ 1.7 μV(A weighting)
Frequency response	20Hz~20kHz(-0.1dB)	Line output level	4.0Vrms(1kHz / 10kΩ)
Frequency response	20Hz~50kHz(-0.7dB)
Audio format support
Lossless:	DSD:DSD64 / 128 / 256(".iso”,".dsf”,".dff”),DST iSO DXD:352.8K / 24bit APE FAST / High / Normal:384kHz / 24bit(MAX) APE Extra High:192kHz / 24bit(MAX) APE Insane:96kHz / 24bit(MAX) Apple Lossless:384kHz / 32bit(MAX) AIFF:384kHz / 32bit(MAX) FLAC:384kHz / 32bit(MAX) WAV:384kHz / 32bit(MAX) WMA LOSSLESS:96kHz / 24bit(MAX) DTS: 192kHz / 24bit（MAX） MQA：Full Decoderer
Lossy compression:	MP3,OGG,WMA,AAC and other formats

Comparison

Name / Model	M15S	M17	M11 Plus LTD	M15
CPU model	Snapdragon 660 14nm	Snapdragon 660 14nm	Snapdragon 660 14nm	Exynos 7872 14nm
CPU frequency	8*Kyro260 (2.2GHz maximum)	8*Kyro260（2.2GHz）	8*Kyro260（2.2GHz）	2GHz（A73×2），1.6GHz（A53×4）
Number of CPU cores	8	8	8	6
DAC	ES9038PRO	ES9038PRO×2	AK4497EQ×2	AK4499EQ×2
Operating system	Highly customized Android system	Highly customized Android system	Highly customized Android system	AK4499EQ×2
Touchscreen	Ten-Point Touchscreen	Ten-Point Touchscreen	Ten-Point Touchscreen	Ten-Point Touchscreen
Keyboard type	Virtual QWERTY keyboard	virtual QWERTY keyboard	virtual QWERTY keyboard	virtual QWERTY keyboard
Special features	Android mode / Pure music mode / USB DAC mode / Bluetooth receiving mode / AirPlay mode / Desktop mode / MQA 8x renderer / customizable multi-function buttons / global no SRC / global All to DSD / 2.5 + 3.5 + 4.4 output, full-screen gesture operation	Coaxial input mode / DC and battery dual power supply system / knob and button dual volume control mode / 2.5 + 3.5 + 4.4 + 6.35 + RCA coaxial port / dual Type C port / global no SRC / global All to DSD	MQA 8x renderer / customizable multi-function buttons / global no SRC / global All to DSD / 2.5 + 3.5 + 4.4 output / full-screen gesture operation	Full format Bluetooth reception / analog potentiometer volume knob / MQA 8x renderer / Corning Gorilla Glass / customizable multi-function buttons / global no SRC / global All to DSD / 2.5 + 3.5 + 4.4 output / full screen gesture operation
User Interface	Android mode / Pure music mode / USB DAC mode / Bluetooth receiving mode / AirPlay mode / Desktop mode (enabled when powered by QC)	Android mode / Pure sound mode / USB decoding mode / Bluetooth receiving mode / Coaxial decoding mode / AirPlay mode	Android mode / Pure sound mode / USB decoding mode / Bluetooth receiving mode / AirPlay mode	Android mode / Pure sound mode / USB decoding mode / Bluetooth receiving mode
Hardware solution	CPU: Snapdragon 660 DAC: ES9038PRO AMP: OPA9262 XTAL: NDK femtosecond xtal2 BT: QCC5124	CPU: Snapdragon 660 DAC: ES9038PRO2 AMP: THX AAA-788+ 2 BT: QCC5124 / USB: XMOS XUF208 XTAL: NDK femtosecond xtal*2	CPU: Snapdragon 660 DAC: AK4497EQ2 AMP: THX AAA-782 XTAL: NDK femtosecond xtal*2	CPU: Exynos 7872 DAC: AK4499EQ2 AMP: OPA22112 + OPA16224 + OPA16124 BT: CSR8675 USB: XMOS XUF208 / XTAL: NDK femtosecond xtal*2 FPGA: A3P030
Hardware solution	Bluetooth transmitter chip: WCN3990, BT5.0	Bluetooth transmitter chip: WCN3990 / BT5.0	Bluetooth transmitter chip: WCN3990 / BT5.0	Bluetooth transmitter chip: SAMSUNG S5N5C10B01-6330
WiFi	2.4G / 5G, supports WiFi music transfer	2.4G / 5G / supports WiFi music transfer	2.4G / 5G / supports WiFi music transfer	2.4G / 5G / supports WiFi music transfer
Bluetooth version	5	5	5	4.2
Bluetooth receiving format	SBC / AAC / aptX / aptX HD / LDAC / LHDC	SBC、AAC、aptX、aptX LL、aptX HD、aptX Adaptive、LDAC	SBC、AAC、aptX、aptX HD，LDAC	LDAC / HWA / aptX / aptX HD / SBC
Bluetooth receiver version	5	5	5	5
Bluetooth transmission format	AAC / SBC / aptX / aptX LL / aptX HD / LDAC / atpX Adaptive	SBC、AAC、aptX、aptX HD，LDAC	SBC、AAC、LDAC	SBC / AAC / aptX / aptX LL / aptX HD / LDAC
DLNA	Supports to access to PC / NAS (upnp protocol)	supports to access to PC / NAS (upnp protocol)	supports to access to PC / NAS (upnp protocol)	supports to access to PC / NAS (upnp protocol)
AirPlay	Yes	Yes	Yes	Yes
FiiO Link	Yes	Yes	Yes	Yes
All to DSD	Yes	Yes	Yes	Yes
MQA	Yes	Yes	Yes	Yes
Three finger pull-down screenshot	Yes	Yes	Yes	Yes
Screen size	5.5 inches	5.99 inches	5.5 inches	5.15 inches
Screen type	IPS high-definition full-fit display	IPS high-definition full-fit incell display	IPS high-definition full-fit display	IPS high-definition full-fit incell display
Resolution	1440*720	1080×2160	1440×720	1440×720
RAM	4GB	4GB	4GB	3GB
Storage expansion type	Micro SD (TF card)	Micro SD (TF card)	Micro SD (TF card)	Micro SD (TF card)
Maximum support expansion	Single TF card, theoretically supports up to 2TB expansion	single TF card / theoretically support up to 2TB expansion	single TF card / theoretically support up to 2TB expansion	single TF card / theoretically support up to 2TB expansion
ROM	64GB	64GB	64GB	64GB
ROM available to user	About 46GB	About 46GB	About 46GB	About 52GB
Button	Physical key + analog potentiometer volume knob + HOLD switch + touch screen	Physical key + analog potentiometer volume knob + volume button + multi-function key + HOLD switch + DC / BAT switch + touch screen	Physical key + volume touch and button all-in-one panel + HOLD switch + touch screen	Physical key + analog potentiometer volume knob + HOLD switch + touch screen
Headphone output ports(PO)	3.5 mm + 2.5mm + 4.4mm	3.5 mm + 2.5mm + 4.4mm + 6.35mm	3.5 mm + 2.5mm + 4.4mm	3.5 mm + 2.5mm + 4.4mm
Analog audio output ports(LO)	3.5 mm port (shared with PO port) 4.4mm BAL port (shared with BAL port)	3.5 mm socket (shared with PO port)	3.5 mm socket (shared with PO port)	3.5 mm socket (shared with PO port)
Multi-function keys	Add to my favorites / One key to randomize the next song / Play and pause / One key to delete the currently playing song, etc. Switch filter or equalizer / Enter USB DAC mode or Bluetooth receiving mode / No function	Add to favorites / play next song randomly / play pause / delete currently playing song / switch filter / equalizer / enter USB DAC mode / Bluetooth receiving mode / no function	Add to favorites / play next song randomly / play pause / delete currently playing song / switch filter / equalizer / enter USB DAC mode / Bluetooth receiving mode / no function	One key to add to favorites / one key to randomize the next song / one key to delete the currently playing song / one key to switch to USB decoding mode / one key to switch to Bluetooth receiving mode / etc.
USB	Two-way TYPE C USB3.0 (charging / data transmission / USB DAC / USB Audio)	Two-way Type-C USB3.0 (charging / data transfer) / USB HOST Type-C USB2.0	Two-way TYPE C USB3.0 (charging / data transmission)	Two-way TYPE C USB2.1 (charging / data transmission / USB DAC / USB Audio)
SPDIF output	3.5mm port (shared with PO port), supports up to 384kHz / 32bit and DSD128	3.5 mm socket (shared with PO port)	3.5mm socket (shared with PO port) / DSD64 / 128 / 384kHz / 32bit / DoP / D2P	3.5mm socket（shared with PO port），DSD64 / 128，384kHz / 32bit，DoP / D3P
Color	Black	black	Black / stainless steel	black
Size	140x80x18.9mm	156.488.528mm	136.675.717.6mm	1347518mm
Weight	About 345g	About 610g	About 310g (black) / 405g (stainless steel)	About307g
Volume control type	Potentiometer knob or button control	Potentiometer knob or button control	Slide or key control	Analog volume knob control
Recommended headphone impedance	8~150Ω (3.5mm headphone output) 8~350Ω (2.5mm + 4.4mm balanced headphone output)	16~600Ω	16~150Ω (3.5mm headphone output)	16~600Ω
Recommended headphone impedance		16~600Ω	16~300Ω (2.5mm + 4.4mm balanced headphone output)	16~600Ω
EQ adjustment	10-band dynamic EQ adjustment (±12dB), built-in 8 preset EQ, custom EQ	10-band dynamic EQ adjustment (±12dB) / built-in 8 preset EQ / custom EQ	10-band dynamic EQ adjustment (±12dB) / built-in 8 preset EQ / custom EQ	10-band dynamic EQ adjustment (±12dB) / built-in 10 preset EQ
Gain selection	L / M / H / Super high / Ultra high gain mode (when connected to DC)	L / M / H / over-ear headphone mode / Enhanced over-ear headphone mode (when connected to DC)	L / M / H	L / H
Over-ear headphone mode	Yes	Yes	N / A	Yes
L / R channel balance adjustment	L20~R20 (0.5dB per level)	Plus or minus 5dB	L20~R20 (0.5dB per level)	Plus or minus 5dB
USB DAC	384kHz / 32bit\|DSD256	192kHz-24bit / DSD64	384kHz / 32bit\|DSD128	768kHz / 32bit\|DSD512
USB Audio	768kHz-32bit / DSD512 (DoP / D2P / Native)	384kHz-24bit / DSD128	768kHz-32bit / DSD512（DoP / D2P / Native）	768kHz-32bit / DSD512 DoP / D2P / Native
Power supply	QC3.0 / QC4.0 and PD2.0 and PD3.0 fast charge / POWER IN DC 12V	QC3.0 / QC4.0 and PD2.0 and PD3.0 fast charge / POWER IN DC 12V	QC4.0 and PD2.0 fast charge	It is recommended to use QC2.0 (DC12V 1.5A) or above charging
Charging display	The large icon in the off state displays real-time charging, and the upper right corner of the on state displays the real-time battery level and battery percentage	The large icon in the off state displays real-time charging / and the upper right corner of the on state displays the real-time battery level and battery percentage	The large icon in the off state displays real-time charging / and the upper right corner of the on state displays the real-time battery level and battery percentage	The large icon in the off state displays real-time charging / and the upper right corner of the on state displays the real-time battery level and battery percentage
Power display	(Real-time power) can display the percentage	(real-time power) can display the percentage	(real-time power) can display the percentage	(real-time power) can display the percentage
Battery capacity	6200mAh 3.8V high voltage fast charge lithium ion polymer battery	9200mAh 3.8V high voltage fast charge lithium ion polymer battery	6000mAh 3.8V high voltage fast charge lithium ion polymer	7490mAh 3.8V high voltage fast charge lithium ion polymer battery
Charging time	＜3.5h (QC3.0 fast charge)	＜4.5h (QC fast charge)	＜3h (QC4.0 fast charge mode)	＜3.5h (DC 12V / 1.6A charging)
Deep standby time	42 days	42days	41days	75days
Battery Life & Test Conditions 1	＞10.5 hours (3.5mm headphone output)	＞10 hours (3.5mm headphone output)	＞11.5 hours (3.5mm headphone output)	＞15 hours (3.5mm headphone output)
Screen status	Off	Off	Off	Off
EQ	Off	Off	Off	Off
Load	32Ω	32Ω	32Ω	27Ω
Play track and format	MP3 44.1kHz / 16bit	MP3 44.1kHz / 16bit	MP3 44.1kHz / 16bit	MP3 44.1kHz / 17bit
Battery Life & Test Conditions 2	＞9 hours (2.5mm + 4.4mm balanced output)	＞8 hours (2.5mm + 4.4mm balanced output)	＞10 hours (2.5mm + 4.4mm balanced output)	＞9 hours (2.5mm headphone output)
volume	29	65	37	50
Screen status	Off	Off	Off	Off
EQ	Off	Off	Off	Off
Load	32Ω	32Ω	32Ω	27Ω
Play track and format	MP3 44.1kHz / 16bit	MP3 44.1kHz / 16bit	MP3 44.1kHz / 16bit	MP3 44.1kHz / 16bit
Software upgrade	Local storage upgrade + micro SD card local upgrade + OTA upgrade	Local storage upgrade + TF card local upgrade + OTA push upgrade	Local storage upgrade + TF card local upgrade + OTA push upgrade	TF card local upgrade / OTA push upgrade
Clock function	Yes	Yes	Yes	Yes
Font size setting	Yes	Yes	Yes	Yes
Third party APP	Factory built-in: FiiO Music, ES file browser, Chrome browser Unlimited, free to install third-party apps	Factory built-in: FiiO Music / ES file browser / Chrome browser Unlimited, free to install third-party apps	Factory built-in: FiiO Music / File Geek / Chrome browser Unlimited, free to install third-party apps	Factory built-in: FiiO Music / ES file browser / Chrome browser Unlimited, free to install third-party apps
Line out performance parameters(LO output)
THD+N	≤0.00034% (1kHz / 10kΩ)	≤0.0006%（1kHz / 10kΩ）	＜0.00079%（1kHz / 10kΩ）	＜0.0004%（1kHz / 10kΩ）
Frequency response	20Hz~20kHz (-0.1dB) 20Hz~50kHz (-0.7dB)	5Hz~80kHz（-3dB）	5Hz~90kHz（-5dB）	20Hz~90kHz（-4dB）
Crosstalk	≥106dB (1kHz / 10kΩ)	≥103dB（1kHz / 10kΩ）	＞105dB（1kHz / 10kΩ）	＞107dB
SNR	≥124.0dB (A-weighted)	≥120dB	＞121dB	≥121dB (dBA)
Noise floor	≤1.2μV (A-weighted)	≤2μV	＜1.7μV	＜1.9μV
Line output level	2V	1.9V	2V	2.1V
Headphone output performance parameter 1 (3.5mm headphone output)
Output power 1	≥475mW（16Ω / THD+N＜1%)	≥740mW（over-ear headphone mode / 16Ω / THD+N＜1%)	≥295mW（16Ω / THD+N＜1%)	≥285mW（16Ω / THD+N＜1%)
Output power 1	≥535mW（16Ω / THD+N＜1%)	≥1.4W（Enhanced over-ear headphone mode / 16Ω / THD+N＜1%)	≥295mW（16Ω / THD+N＜1%)	≥405mW（over-ear headphone mode / 16Ω / THD+N＜1%)
Output power 2	≥395mW（32Ω / THD+N＜1%)	≥500mW（over-ear headphone mode / 32Ω / THD+N＜1%)	≥206mW（32Ω / THD+N＜1%)	≥215mW（32Ω / THD+N＜1%)
Output power 2	≥580mW（32Ω / THD+N＜1%)	≥1.1mW（Enhanced over-ear headphone mode / 32Ω / THD+N＜1%)	≥206mW（32Ω / THD+N＜1%)	≥490mW（over-ear headphone mode / 32Ω / THD+N＜1%)
Output power3	≥57mW（300Ω / THD+N＜1%)	≥63mW（over-ear headphone mode300Ω / THD+N＜1%)	≥23mW（300Ω / THD+N＜1%)	≥31mW（300Ω / THD+N＜1%)
Output power3	≥93mW（300Ω / THD+N＜1%)	≥126mW（Enhanced over-ear headphone mode / 300Ω / THD+N＜1%)	≥23mW（300Ω / THD+N＜1%)	≥70mW（over-ear headphone mode / 300Ω / THD+N＜1%)
Frequency response	20Hz~20kHz（-0.15dB） 20Hz~50kHz（-1.0dB）	5Hz~80kHz（-3dB）	20Hz~80 kHz（-3dB）	20Hz~90kHz（-4dB）
SNR	≥121dB（A-weighted）	≥122dB（dBA）	≥120dB	≥121dB（dBA）
SNR	≥121dB（A-weighted）	≥122dB（dBA）	≥120dB	≥119dB（over-ear headphone mode / A计权）
Output impedance	≤1.4Ω（32Ω）	≤1Ω	≤1Ω	≤1.4Ω
THD+N	≤0.0005%（1kHz / 32Ω）	≤0.0007%（1kHz / 32Ω）	＜0.0006%（1kHz / 32Ω）	＜0.0005%（1kHz / 32Ω）
CROSSTALK	≥80dB（1kHz / 32Ω）	≥75dB（1kHz / 32Ω）	≥76dB（1kHz / 32Ω）	＞77dB（1kHz / 32Ω）
CROSSTALK	≥80dB（1kHz / 32Ω）	≥75dB（1kHz / 32Ω）	≥76dB（1kHz / 32Ω）	＞115dB（no load）
Noise floor	≤3.2μV（A-weighted）	≤3.5μV	＜2μV	＜2.1μV
Noise floor	≤3.2μV（A-weighted）	≤3.5μV	＜2μV	＜3μV（over-ear headphone mode）
Headphone output performance parameter 2 (2.5mm headphone output)
Output power 1	≥531mW（16Ω / THD+N＜1%)	≥1.5W（over-ear headphone mode / 16Ω / THD+N＜1%)	≥500mW（16Ω / THD+N＜1%)	≥420mW（16Ω / THD+N＜1%)
Output power 1	≥531mW（16Ω / THD+N＜1%)	≥1.5W（Enhanced over-ear headphone mode / 16Ω / THD+N＜1%)	≥500mW（16Ω / THD+N＜1%)	≥370mW（over-ear headphone mode / 16Ω / THD+N＜1%)
Output power 2	≥990mW（32Ω / THD+N＜1%）	≥1.5W（over-ear headphone mode / 32Ω / THD+N＜1%）	≥588mW（4.3V）（32Ω / THD+N＜1%）	≥635mW（4.2V）（32Ω / THD+N＜1%）
Output power 2	≥1200mW（32Ω / THD+N＜1%）	≥3W（Enhanced over-ear headphone mode / 32Ω / THD+N＜1%）	≥588mW（4.3V）（32Ω / THD+N＜1%）	≥800mW（over-ear headphone mode / 16Ω / THD+N＜1%)
Output power 3	≥226mW（300Ω / THD+N＜1%)	≥250mW（over-ear headphone mode / 300Ω / THD+N＜1%)	≥88mW（300Ω / THD+N＜1%)	≥120mW（300Ω / THD+N＜1%)
Output power 3	≥368mW（300Ω / THD+N＜1%)	≥500mW（Enhanced over-ear headphone mode / 300Ω / THD+N＜1%)	≥88mW（300Ω / THD+N＜1%)	≥280mW（over-ear headphone mode / 16Ω / THD+N＜1%)
Frequency response	20Hz~20kHz（-0.15dB） 20Hz~50kHz（-1.0dB）	5Hz~80kHz（-3dB）	20Hz~92kHz（-5dB）	20Hz~90kHz（-4dB）
SNR	≥120.5dB（A-weighted）	≥123dB	≥120.5dB	≥122dB（dBA）
SNR	≥120.5dB（A-weighted）	≥123dB	≥120.5dB	≥118dB（over-ear headphone mode / A计权）
Output impedance	≤2.3Ω（32Ω）	≤2Ω	＜2Ω	≤3Ω
THD+N	≤0.00075%（1kHz / 32Ω）	≤0.0007%（1kHz / 32Ω）	＜0.00146%（1kHz / 32Ω）	＜0.0006%（over-ear headphone mode / 1kHz / 300Ω）
CROSSTALK	≥105.6dB（1kHz / 32Ω）	≥108dB（1kHz / 32Ω）	≥111dB（1kHz / 32Ω）	＞103dB（1kHz / 33Ω）
CROSSTALK	≥105.6dB（1kHz / 32Ω）	≥108dB（1kHz / 32Ω）	≥111dB（1kHz / 32Ω）	＞118dB（no load）
Noise floor	≤5.2μV（A-weighted）	≤7μV	＜3μV	＜3.8μV
Noise floor	≤5.2μV（A-weighted）	≤7μV	＜3μV	＜5.2μV（over-ear headphone mode）
Audio format support
Lossless	DSD：DSD64 / 128 / 256（“.iso”, “.dsf”, “.dff”），DST iSO	DSD：DSD64 / 128 / 256（“.iso”, “.dsf”, “.dff”），DST iSO	DSD：DSD64 / 128 / 256（“.iso”, “.dsf”, “.dff”），DST iSO	DSD：DSD64 / 128 / 256（“.iso”, “.dsf”, “.dff”），dst
	DXD：352.8kHz / 24bit	DXD：352.8kHz / 24bit	DXD：352.8K / 24bit	DXD：352.9K
	APE FAST / High / Normal：384kHz / 24bit（MAX）	APE FAST / High / Normal：384kHz / 24bit（MAX）	APE FAST / High / Normal：384kHz / 24bit（MAX）	APE FAST / High / Normal：384kHz / 25bit（MAX）
	APE Extra High：192kHz / 24bit（MAX）	APE Extra High：192kHz / 24bit（MAX）	APE Extra High：192kHz / 24bit（MAX）	APE Extra High：192kHz / 25bit（MAX）
	APE Insane：96kHz / 24bit（MAX）	APE Insane：96kHz / 24bit（MAX）	APE Insane：96kHz / 24bit（MAX）	APE Insane：96kHz / 25bit（MAX）
	Apple Lossless：384kHz / 32bit（MAX）	Apple Lossless：384kHz / 32bit（MAX）	Apple Lossless：384kHz / 32bit（MAX）	Apple Lossless：384kHz / 33bit（MAX）

FiiO M15s Portable Music Player