DAC / AmpOverreview

FiiO M11S

Name: FiiO M11S
Brand: FiiO

FiiO's $499 Android player wins the press over on power, silence and speed — and loses some owners on bugs, bulk and battery.

24 sourcesUpdated 2026-11-04

$500Typical US price

Score aggregates reviewer opinions across topics.

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The short version

What to know.

Reviewers broadly agree the M11S is quiet enough for very sensitive IEMs, has plenty of power from its balanced outputs (less from the 3.5 mm jack), packs nearly every feature a player can have, and is good value at $499 — though its 32 GB of storage is small, and most find it chunky for a pocket. Opinion splits on its sound: the largest group hears it neutral, another a forward, sometimes hot upper range, and a smaller one warm and relaxed, while the one independent bench shows clean but unremarkable figures. Battery life and interface speed also divide reviewers and owners. The sharpest split is durability: reviewers praise the machined build, while owners report SD-card errors, track-start stutter, app crashes and some failed outputs. Amazon owners rate it 3.9 of 5.

About this product

FiiO's 2022 Android digital audio player — two ES9038Q2M DACs, OPA926 amplification, a Snapdragon 660 and a 5-inch screen — and the third generation of the M11 line. It sits below the M11 Plus ESS and M11 Plus LTD; it is not the original 2019 M11 (AK4493 DACs, Android 7) or the M11 Pro. Reviewed here as a portable DAC/amp that also plays music on its own.

FiiO's M11S is a full Android 10 music player — Snapdragon 660, 3 GB of RAM, a 5-inch 720p screen — built around two ESS ES9038Q2M DACs and an op-amp output stage rated at 670 mW into 32 Ω from its balanced jacks. It has 3.5 mm, 2.5 mm and 4.4 mm outputs, runs streaming apps from the Play Store with FiiO's sample-rate-converter bypass, and doubles as a USB DAC, a Bluetooth receiver, an AirPlay target and a Roon Ready endpoint. It launched in China in September 2022 and worldwide that autumn at $499.

It was FiiO's return to the mid-price player after a run of $700-and-up models, a cheaper and smaller sibling to the M11 Plus ESS, and the launch reviews were warm. Since then FiiO has released newer players around it, and by late 2026 US stock had thinned to a few third-party listings.

A good fit for

Owners of sensitive IEMs who want a dead-quiet source with balanced outputs
Listeners who stream through Android apps or Roon and want one box that also works as a USB DAC and Bluetooth receiver
Buyers who want most of a pricier player's abilities for around $500

Think twice if

You want a truly pocketable player, or the longest battery life
You drive demanding planars or full-size headphones from the 3.5 mm jack
You keep a large local library on microSD and can't tolerate storage or playback bugs
Bright or treble-forward IEMs already bother you

The reviewer consensus

Agreement &
disagreement.

2 / 7topics divide opinion

1 Strong agreement4 Mostly agree2 Divided opinions

Common ground4

Quiet enough for very sensitive IEMs, even with Wi-Fi and Bluetooth on
Plenty of power from the balanced 2.5 mm and 4.4 mm outputs for IEMs and most headphones; the 3.5 mm output is weaker
Nearly every player feature there is, from the Play Store and SRC bypass to Roon Ready, AirPlay and two-way Bluetooth
Good value at $499, though the 32 GB of built-in storage is small

Points of contention3

Its sound: neutral and uncoloured, energetic with a hot upper range, or warm and relaxed
Durability: reviewers praise the machined build, owners report SD-card errors, playback stutter, app crashes and some failed outputs
Battery life and interface speed: 14–16 hours and fluid for some, 8–11 hours and laggy for others

A closer listen.

7 topics · 2 divided

Left: criticalRight: positiveTighter lines: more agreement

Choose a topic

Power

Leans positiveMostly agree

Reviewer sentiment10 supporting sources

CriticalNeutralPositive

Band: opinion spread · Dot: weighted average

Mostly praised from the balanced outputs: reviewers drove HD 650s, Sundaras, a Focal Clear and even an HD 800 S from 2.5 mm or 4.4 mm with headroom to spare. The caveats are consistent. The 3.5 mm output is noticeably weaker, and two reviewers found harder planars and full-size headphones — a HiFiMAN Edition XS, a Meze Liric — needed most or all of the volume range.

“it drove all the headphones with ease and plenty of headroom while it was dead silent with the sensitive earphones.”
Ichos, Head-Fi (HD 650/660S, Sundara, Meze 109 Pro, Focal Clear Mg)

“Output power is more limited on single-ended connection so the balanced output would be recommended unless you plan to use it with an amplifier.”
Headfonics

“Planar headphones like the HiFiMAN Edition XS needed to be boosted to a little past 80% in order to hit a comfortable loudness to enjoy.”
Alex Schiffer, Major HiFi

Measured

L7Audio Lab's sweeps show the single-ended output clipping at about 2.4 Vrms and the balanced output at about 4.5 Vrms into 32 Ω (roughly 0.6 W). FiiO rates the balanced output at 670 mW into 32 Ω and 90 mW into 300 Ω, and the single-ended at 200 mW and 23 mW.

vs. listeners — The 'not enough' reports both involve demanding full-size headphones (an Edition XS, a Meze Liric), and AVForums found the single-ended jack noticeably quieter than the balanced ones — consistent with FiiO's own figures, which give the 3.5 mm output about a third of the balanced power.

Link to this topic

Transparency

Leans positiveDivided opinions

Reviewer sentiment16 supporting sources

CriticalNeutralPositive

Band: opinion spread · Dot: weighted average

Sources split on what the M11S sounds like. The largest group hears it as neutral and uncoloured (one critic hears that neutrality as sterile). Another hears an energetic tuning with forward upper mids and treble that can turn hot or sharp on bright recordings or at high volume. A smaller group hears it as warm, smooth and laid back. Several in both of the last two groups find it less punchy than FiiO's pricier M11 Plus ESS. The one independent bench shows clean but not class-leading figures.

Measured

L7Audio Lab measured SINAD of about 100 dB from the single-ended output at 2 Vrms and 111 dB from the balanced output at 4 Vrms, and summed up its audio performance as “一般” (“average”). FiiO rates both line outputs within 0.5 dB from 20 Hz to 20 kHz.

vs. listeners — Nothing published shows a tonal tilt, so the warm and bright readings aren't explained by a measured frequency response. The setups differ in ways that plausibly matter: single-ended vs balanced (about 11 dB apart in L7's SINAD figures, and the 3.5 mm jack plays quieter, which skews comparisons that aren't level-matched), What Hi-Fi? listened with All To DSD and Pure Music mode on, and the hot-treble reports came on particular IEMs (a Sennheiser IE 900 at AVForums; a Campfire Pathfinder and Shanling ME800 at Headfonia).

Where it splits

Neutral and uncoloured — little sound of its own43%

“The FiiO sounds natural – neither warm nor particularly crisp, music has a solidity to it, and distortion is minimal if there is any at all.”
Kob Monney, Trusted Reviews

Energetic, with forward upper mids and a treble that can turn hot35%

“Treble response is zesty at its most benign, and if given unsympathetic material to deal with or if asked to play at properly tinnitus-adjacent volumes, it can become sharp and insubstantial.”
AVForums

Warm, smooth and relaxed — rich mids, softer punch22%

“Add to that a tonality on the richer side of neutral, and a particular lushness in the midrange, and we come back to its sonic comfort.”
What Hi-Fi?

Link to this topic

The hardware

Specifications.

Checked 2026-11-04

Design

Form factor: Portable
DAC: ES9038Q2M ×2 · Delta-sigma
PCM: 384 kHz / 32-bit
DSD: DSD256
MQA: Yes
Amplifier: Solid-state · OPA926 ×2

Output

Output power: Single-ended: 300 mW @ 16 Ω · 200 mW @ 32 Ω · 23 mW @ 300 ΩBalanced: 550 mW @ 16 Ω · 670 mW @ 32 Ω · 90 mW @ 300 Ω
Output impedance: < 1.5 Ω SE · < 2.6 Ω bal.
Gain settings: 3
Signal-to-noise: ≥ 123 dB
EQ: Graphic, 10 bands

Connection

Digital inputs: USB-C, Bluetooth, Wi-Fi
Headphone outputs: 3.5 mm, 2.5 mm, 4.4 mm
Line outputs: 3.5 mm, 4.4 mm, Coaxial
Bluetooth: Bluetooth 5.0SBC, AAC, aptX, aptX HD, LDAC, LHDC
Power: Battery

Physical

Weight: 271 g
Dimensions: 74 × 18.5 × 125.2 mm

The 3.5 mm jack doubles as line out and coaxial out; the 4.4 mm jack doubles as balanced line out. Manufacturer-published figures, not measurements · from fiio.com.

Follow the evidence

Sources 24

Read with context

Limitations & method.

As of 2026-11-04

What to keep in mind 5

A read of where reviewers and owners land as of November 2026. Most reviews date from the 2022–23 launch window, and FiiO has released newer players since.
Only one independent lab has measured the M11S, so the power and noise figures lean partly on FiiO's own ratings.
How it sounds depends heavily on which output you use: the balanced jacks are louder and measure cleaner than the 3.5 mm one. Your IEMs or headphones matter too — bright ones make its upper range stand out.
Battery life varies a lot with use: screen-on streaming and the balanced outputs drain it much faster than local files with the screen off.
Owner star ratings skew toward people who chose to buy it. The fault reports come from a self-selected minority, so they show what can go wrong, not how often it does.

Where to buy Product & retailer links

FiiO M11S Amazon

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FiiO M11S

How the score adds up

What to know.

A good fit for

Think twice if

Agreement &
disagreement.

Common ground4

Points of contention3

A closer listen.

Power

Measured

Noise

Measured

Transparency

Measured

Features

Ergonomics

Measured

Build

Value

Specifications.

Design

Output

Connection

Physical

Sources 24

Limitations & method.

What to keep in mind 5