FiiO M11 Plus LTD Review

Since I received it, my FiiO M11 has been my primary DAP for burning in products and use in reviews. Unfortunately, I missed out on the M11 Pro which offered an upgraded DAC and Amplifier, but now the FiiO M11 Plus LTD has come my way with an upgraded everything including Android 10 as opposed to Andriod 7.

FiiO M11 Plus LTD

The FiiO M11 Plus LTD:

First, the FiiO M11 Plus LTD is a bit larger than its predecessor, in all dimensions, meaning it also has a larger display 5.5” vs. 5.1”.  It is also about a third heavier and there is a stainless steel model that is heavier still (twice as much as an M11). Plus all of the operational controls have changed. On the left side are the power button, the volume touchpad (replacing the mechanical volume control on the M11) which has a mechanical up/down toggle or a contact slide volume, and the customizable multi-function shortcut button. On the right side are the previous track, play/pause, and next track buttons, plus the hold switch (disables all buttons) and the TFT card slot. All of the outputs and inputs are on the bottom including USB-C, 3.5mm TRS single-ended/line out/coax out, and 4.4mm TRRRS and 2.5mm TRRS balanced output (the 4.4mm TRRRS is also the balanced line output).

The component upgrades include a Qualcomm Snapdragon 660, dual AKM AK4497EQ DACs, and dual THX AAA-78 amplifier architecture. There is also an all-new Digital Audio Purification System (DAPS) employing a 4th-gen FPGA with two NDK femtosecond crystal oscillators to provide a high-precision and low jitter unified clock source for the entire audio architecture. A modular internally shielded anti-interference circuit design has been incorporated completely isolating analog and digital sections along with an enhanced power supply with separate power supplies for each process. All this upgraded hardware does come at a slight cost in battery life, but it still clocks in at a respectable 10 hrs for balanced output and 11 ½  hrs for single-ended output probably mostly due to the higher power output.

FiiO M11 Plus LTD

Two-way Bluetooth 5.0 connectivity is provided with SBC/AAC/aptX/aptX-HD/LDAC codecs supported for transmission and SBC/AAC/LDAC codecs supported for reception.

FiiO’s 6th-gen Honeycomb design is adopted for the casing with hexagonal buttons and diamond-cut texture to the back cover giving the M11 Plus LTD a unique look.

Additional features include AirPlay support, a 10 band graphic equalizer, all to DSD decoding, 6 digital filter settings, balance control, USB DAC mode, Pure Music Mode, MQA 8X decoding, and three gain settings.

For accessories, the M11 Plus LTD came with a factory pre-applied tempered glass screen protector, a leatherette case, a USB3 (Type-A to Type-C) cable, a coaxial (S/PDIF) adaptor cable, an ejector pin, and the usual warranty card and quick start guide.

FiiO M11 Plus LTD


The story goes that back in the dark ages of the 1980s Tomlinson Holman went to a theater to see “The Empire Strikes Back” and was horrified to discover that the sound was nothing like what he had experienced in the mixing booth, and so with the support of George Lucas, he designed a sound system that would replicate the sound of his sound room in the theater, and thus was born the Tomlinson Holman eXperiment or THX. In the beginning, THX engineers would install the system then seal the controls so the theater owners could not change the settings. Later, with the boom of box theaters, THX simply became a standard with two levels of equipment requirements, and it became clear that there was a market for this standard in the growing Home Theater world (In fact I was involved in the design of the first home theater system using an actual THX theater system about a year before THX began licensing audio manufacturers to sell THX systems). Flash forwarding to the present, THX saw an opportunity for their audio expertise and standardization in the Personal Audio market and developed the THX AAA chip to fulfill this need. The features and benefits are as follows:

  • Patented feed-forward error correction topology that nulls conventional distortion mechanisms
  • Reduction of harmonic, intermodulation, and crossover distortion by up to 40dB, resulting in a realistic and fatigue-free listening experience
  • Enables maximum output power for greater dynamic range and sound pressure level (SPL)
  • A convenient modular solution which includes power supply, and can operate from a single 3.6V battery
  • Minimal bias current and highly efficient power management to optimize and extend device battery life
  • Scalability that allows incorporation into any headphone or in-vehicle amplifier design, with the flexibility to match the required fidelity, output power, and price point

Living with the FiiO M11 Plus LTD:

For testing purposes I decided to use three different headphones, the FiiO FH7 IEM (I used the FiiO M11 Plus LTD for my review of the FiiO FH5s so I didn’t see a point in repeating), the Dan Clark Audio ETHER2 Planar Magnetic Headphones, and the HiFiMan HE6se Planar Magnetic Headphones. As is my usual habit I burned in the M11 Plus LTD for about a week before listening using my usual Qobuz burn-in playlists.

The Flatlanders’ “Treasure of Love”

Though, as implied above, I had already spent a bit of time listening to the M11 Plus LTD, I began my serious listening test with my usual visit to Qobuz checking out The Flatlanders’ “Treasure of Love” (24-bit/44.1kHz) running the FH7s via the balanced out on low gain in “All to DSD” mode with the “Super Slow Roll-Off” Filter selected. The noise floor was excellent and the dynamics evident. The bass had good weight and the percussion was tight. The soundstage was in studio intimate as if the musicians were only a few feet away. Overall the tonal balance was neutral and the instruments sounded natural.

“Pavarotti 24 Greatest”

“ La Bohème: Che gelida manina” as performed by Luciano Pavarotti (“Pavarotti 24 Greatest” 24-bit/96kHz) offered up a much larger soundstage placing Pavarotti at a distance slightly behind the orchestra (note: it is usual for the orchestra to be in the pit in front of the stage for opera) with the extreme dynamics of his voice well painted. Once again the timbre and tonal balance of the instruments was natural and realistic.

The Wallflowers’ “Exit Wounds”

To test the Bluetooth Receiving mode I used my Motorola Moto G Power transmitting Qobuz playing The Wallflowers’ “Exit Wounds” (24-bit/48kHz) via LDAC. The sound was excellent with no hint of compression and the range was good.

 “True” by Spandau Ballet

Though I had to set the M11 Plus LTD to high gain I was able to drive the ETHER2 to reasonable volumes listening to “True” by Spandau Ballet (“True” – DSD64) in Pure Music mode but had to go back to balanced to achieve full dynamics. Another intimate in-studio experience was imparted with strong tight bass, as well as, clean, clear, and dynamic mids and highs on the guitars, keyboards, and vocals.

Sonny Boy Williamson’s “The Sky Is Crying”

Breaking out the HE6se as a final torture test I cued up Sonny Boy Williamson’s “The Sky Is Crying” (DSD128). While I had to run the M11 Plus LTD at full bore the sound was clear and dynamic without distortion and the noise floor was silent retaining all the musicality of the much more efficient IEMs despite the HE6se’s unforgiving nature.

I will note that the M11 Plus LTD was warm to the touch following my listening session, but that is to be expected running All to DSD and pushing hard to drive headphones at full volume.

Conclusions on the FiiO M11 Plus LTD:

FiiO M11 Plus LTD

There is no question that the FiiO M11 Plus LTD is a significant upgrade over the M11 and I would guess the M11 Pro. THX have achieved their goal with the THX AAA-78*2 amplifier architecture of providing a powerful dynamic low distortion and linear solution for portable devices, and FiiO’s implementation takes full advantage of its characteristics. Plus the AKM AK4497EQ is simply one of the most musical DAC chips available, and again FiiO’s utilization and support of this chip is completely admirable, wringing the best possible sound from it.

With its musicality, versatility, and power, it would not be a stretch to say that the M11 Plus LTD is the best portable solution in its price range, able to fulfill almost any use requirement whether as a DAP, a portable USB, or Bluetooth DAC/Amp or a music server for a Bluetooth speaker system. I would say that it would be of benefit to grab up the limited edition bit of magic while they are still available, a full wholehearted recommendation.

Price: $799

Manufacturer’s Website:


General introduction
Name / Model No.M11 Plus LTDUser InterfaceAndroid/Pure Music/USB DAC/Bluetooth Receiver/AirPlay mode
CPU ModelQualcomm Snapdragon 660No. of cores8
CPU operating frequency8*Kyro 260(up to 2.2GHz)DACAK4497EQ×2
Hardware usedSoC:Snapdragon 660,DAC:AK4497EQ*2,LPF:OPA1642*3,AMP:LMH6644*2,NDK Femtosecond crystal oscillator*2Special FeaturesOut-of-print AK4497EQ*2, THX AAA-78*2 amp architecture, legendary eight-core master Snapdragon 660, sixth-generation honeycomb shape, 5.5-inch 18:9 full-screen, a new generation of intelligent volume interaction system, new DAPS digital audio purification System, Android 10 version, global MQA 8x unfold
USBTYPE C Two-way USB3.0WiFi2.4GHz/5GHz
Bluetooth TransmitSBC/AAC/aptX/aptX HD/LDACBluetooth Receive(5.0)SBC/AAC/LDAC
AirPlaySupportedDLNA/NASUPNP protocol supported
FiiO LinkSupportedWiFi music transferSupported
Display screen
Display size5.5 inchesDisplay typeIPS Hi-Res incell screen
Resolution1440×720Touchscreen10-finger multi-touch
Storage expansion typeMicro SD(TF card),Hidden TF slotROM available to userAbout 46G
Maximum storage expansion2TB (theoretically)  
Buttons and ports
ButtonsPhysical button + analog potentiometer volume knob + HOLD lock switch + touch screenUSBTwo-way TYPE C USB3.0(Charging/Data transmission/USB DAC/USB Audio)
USB DAC384kHz-32bit/DSD128USB Audio384kHz-32bit/DSD256(Supports DoP/D2P/Native)
Headphone Out (PO)3.5 mm headphone jack+2.5mm balanced headphone jack+4.4mm balanced headphone
jack, 384kHz-32bit/DSD256
Line out(LO)3.5 mm port(shared PO)
SPDIF Output3.5mm port(shared PO, up to 384kHz-32bit/DSD128)Balanced line out4.4 mm port(shared 4.4mm balanced port)
ColorBlack/Stainless steelDimensionsAbout 136.6×75.7×17.6mm
WeightAbout 310g (Black)/405g (Stainless steel)Volume control typeSlide or button control
Recommended headphone impedance16~150Ω (3.5mm headphone output)Equalizer10-band EQ (±12dB), 8 presets+custom preset, custom EQ supported
16~300Ω (2.5mm+4.4mm balanced output)
Gain controlL/M/HL/R channel balance adjustmentL20~R20 (0.5dB every level)
Power specifications
USB power adapterQC4.0/ PD2.0 quick chargeBattery capacity6000mAh
Charging timeAbout 3h (QC4.0 quick charge)Deep sleep time>1000h
Battery Life & Test Conditions
3.5mm headphone output:>11.5h
ScreenOFFTest FileMP3 44.1kHz/16bit
2.5mm+4.4mm balanced output:>10h
ScreenOFFTest FileMP3 44.1kHz/16bit
Firmware UpgradeSupports via zip file + TF card + OTAAll to DSDSupported
MQASupports 8x MQANavigation controlGesture control/2-Bottom navigation/3-Bottom navigation
Dark themeSupportedNight LightSupported
Double click to wakeupSupportedPower-off timersSupports sleep/Idle poweroff
In-vehicle modeWould power on/off automatically when vehicle engine starts/stopsPulsing IndicatorCan be set to always on/breath/off, the brightness can be customized
ScreenshotScreenshot by three-fingers swiping down and pressing both the power and the volume –
Locate Currently Playing Track with One-clickSupported
Custom playlist sortingSupportedThird-party apps supportSupports any app
Headphone out specifications 1(3.5mm port, A-wt.)
Output power 1≥295mW(16Ω / THD+N<1%)Output impedance≤1Ω
Output power 2≥206mW(32Ω /THD+N<1%)THD+N<0.0006%(1kHz/32Ω)
Output power 3≥23mW(300Ω / THD+N<1%)Separation≥76dB(1kHz/32Ω)
Noise floor<2μVSNR≥120dB
Line output specifications(A-wt.)
Frequency Response5Hz~90kHz(-5dB)Noise floor<1.7μV
Channel Separation>105dB(1kHz/10kΩ)Line level2V
Balanced out specifications 2(2.5mm+4.4mm balanced output, A-wt.)
Output power 1≥500mW(16Ω / THD+N<1%)Output impedance≤2Ω
Output power 2≥588mW(4.3V)(32Ω /THD+N<1%)THD+N<0.00146%(1kHz/32Ω)
Output power 3≥88mW(300Ω /THD+N<1%)Separation≥111dB(1kHz/32Ω)
Noise floor<3μVSNR≥120.5dB
Balanced line output specifications(A-wt.)
Frequency Response5Hz~90kHz(-5dB)Noise floor<2μV
Channel Separation>114dB(1kHz/10kΩ)Line level2.61V
File format support
Lossless:DSD:DSD64/128/256(“.iso”,“.dsf”,“.dff”),DST iSO
APE FAST/High/Normal:384kHz/24bit(MAX)
APE Extra High:192kHz/24bit(MAX)
APE Insane:96kHz/24bit(MAX)
Apple Lossless:384kHz/32bit(MAX)
Lossy compression:MP3, OGG, WMA, AAC, etc

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Gary Alan Barker

Gary Alan Barker is a writer who has been a member of the Audio Industry since 1978, having acted as technical writer for several high-end audio companies, and been an electronics hobbyist since 1960. He has also been a musician and writer since the mid 1960s.

  • peripheralview1
  • 2021-08-22 16:48:41
  • While I winced at the price point, I ultimately pulled the trigger and dove in at $749 on Amazon. Having come from an original version Fiio M3, and then an M7, I didn't want to pass on the chance of picking up this device before they run out of production/availability. The M7 will still see duty on the go and at the gym, and this device will make it's home bedside with a set of AKG K545's. Thank you again for the review Guru!
  • Reply

  • Gary Alan Barker
  • 2021-08-22 16:57:59
  • Thank you, I'm glad you enjoyed it.
  • Reply

  • Stephen Weller
  • 2021-08-03 11:41:31
  • I love my Fiio devices. But while I won't be buying one of these ($799!), thank you the same for an interesting and very well written article.
  • Reply

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