FiiO M15S Review


In this article we review the all new high-end FiiO M15S DAP, priced at just $999 USD.


Disclaimer: the FiiO M15S was sent to us, free of charge, by the brand in exchange for our honest opinion.

About FiiO

Founded in 2007, FiiO is one of the pillars of the portable audiophile world, with companies like Astell&Kern, iBasso, and Meze. IEMs, headphone amps, DACs, and obviously DAPs, they did it all and did it well, filling each and every corner with an endless list of multi-awarded devices, like the K9 Pro, BTR5, Q3, or the M11.

And if the brand began as a chi-fi maker, with cheap but nice products, FiiO has been constantly moving upmarket and, nowadays, it’d be hard to truly label them as “chi-fi”, rather than Hi-Fi – especially with TOTL players like the FiiO M17.

An amazing player, I considered “one, if not the best player you can get in this price range – as long as you’re okay to carry this little brick with you – that was gifted an “Headfonia Award” for best DAP, thanks to its amazing performances, sheer power and unrivalled versatility .

But, like every flagship, the M17 doesn’t come cheap – $1,799 USD, even more on certain markets – and the only other high end option the brand offers is the Q7, a DAC-AMP that needs a source. Sure, you could get the M11 Plus ESS, but at $799 USD, this player wasn’t designed to compete with high-end, but mid-end competitors.

And that’s where the new FiiO M15S comes in, a revamp of FiiO’s previous flagship, launched back in the days where AKM ruled like a king over the DAP market. And, if FiiO has no plans to replace the M6 / M7 / M9 anytime soon, many of us were waiting for a more affordable high-end DAP like this one..

And so, here it is now, the new FiiO M15S, the successor!


The FiiO M1X Series

Few players have experienced as many variations as the M11. Since its first appearance in 2019, this player has seen no less than five variances:

  • the M11S, FiiO’s actual entry-level DAP, that fits almost all of its bigger siblings features, at the cheaper price point, only with lesser sound performances and power
  • the M11 Plus LTD, introducing a new design, a faster CPU, and the same audio circuit found on the M11 Pro
  • the M11 Plus ESS, same as the LTD but with a dual ES9068AS chip instead of the AKM (for obvious reasons)
  • the FiiO M15S, the brand new top-of-the-range player, which keeps everything that made the success of the first generation and corrects all the defects that were pointed out on the previous device
  • the FiiO M17, a flagship packing a dual ES9038Pro DAC, 5 different kind of outputs and desktop-class amplification

A good line-up, that only miss a true entry-level player like the old M9 in my opinion, but let’s dig into the review.

dap-fiio-m11s-headfonia-28-1 Award

Design & Build Quality


For the FiiO M15S, the brand did a slight revamp of the original design. Sure, from afar, the difference could be hard to spot for the untrained eye, but not for anyone who owns or owned a M15 first gen. There’s the new volume wheel of course – larger and grippier – that shifted from left to right; the blacked-out headphone ports, where the M15 displayed gold anywhere it could and, of course, the bigger screen (5.5” vs 5.15”).

As usual with the brand, build quality is absolutely flawless, with no gaps and premium materials everywhere your eye can see, and your hand’s touch. Front panel? Gorilla glass. Back panel? Same with the usual polygonal coated pattern. The case? Neat, CNC’ed, polished matte black aluminum with enhanced coating that gives that subtle, but delightful premium touch. Even the button were updated, as we’ll see in later on.

Size-wise, the FiiO M15S gets even taller and wider than its predecessor – which wasn’t small by any mean : 140mm tall, 79,4mm wide, 19,3mm thick and 345g on the scale. Dimensions that remains smaller than the M17, but don’t be fooled, this is still a massive player and I had more problems fitting the player in my pockets, than my iPhone 13 Pro Max.



On first look, the FiiO M15S layout didn’t change one bit, but as we’ll see, those are welcome updates.

On the left side you have:

  • the classic power on/off button
  • prev/next and play/pause buttons
  • the micro-SD card opening (it’s not a tray anymore!)

While on the right side you get:

  • the HOLD switch
  • a volume up / Volume down button
  • a multifunction button

At the bottom you have:

  • an USB-C port
  • the micro-SD tray (why not keep the good old port…)


And finally up-top you get:

  • a 3.5mm headphone/line/digital output, so you can connect your headphone, a headphone amp, or even a DAC,
  • a 2.5mm balanced headphone output, a classic
  • 4.4mm Pentaconn balanced headphone output that doubles as a balanced line output, for amplifier like the Astell&Kern PA10

As stated before, all headphone outputs are now completely blacked out and if some will like this sobriety, others will prefer the classic gold-plated 4.4mm Pentaconn look. That said, the real updates here are:

  • the new Balanced output, which could be useful for anyone using an amp with the aforementioned port,
  • the new power up/down button, for those that prefer step by step increase/decrease, instead of the mighty knob
  • the convex shape of buttons, that make them a lot more confortable to use on the go

A very nice layout all-in-all, that fits directly in line with the M11S/M11 Plus new style. I like that.



With a bigger body, the screen is now naturally wider too.

And with a 5.5 inch wide IPS screen (0.35” bigger than the M15), boasting the same 16,7 million colors, “retina” 300PPI definition thanks to the 1280×720 resolution, and a 88% screen-to-body ratio. FiiO is proud to announce a borderless screen – if you omit the little black bar at the bottom of the player.

In addition to that, the screen remains in the top range with a large viewing angle, fast refresh rate, and vivid colors, boosted by Android 10 and a faster CPU (Qualcomm 660+), so if you want to get a better screen, you’ll have to check out higher-end models like the M17, or the wondrous DX320.


Inside the box

The FiiO M15S bundle is surprisingly complete as you can see with the picture. And this time, the player didn’t come with an humoungusly big box nailed, hurray!


In the box you get:

  • the FiiO M15S
  • a premium leather-like case (a beautiful one nonetheless)
  • two USB-C cable (1x USB-C to USB-C and 1x USB-C to USB-A)
  • an USB-C to USB-A adapter
  • the DK3S dock for heat dissipation, now coming in two parts for simpler carry-on
  • one micro-SD card removal tool
  • a tempered glass directly applied at the factory
  • some documentations

So yeah, FiiO was pretty generous with this one. Big kudos!

The article continues on Page Two, after the click here

Page 1: about FiiO

Page 2: UI, Usage, Bundle

Page 3: Technical specifications

Page 4: Sound performance

4.6/5 - (16 votes)

A nerdy guy with a passion for audio and gadgets, he likes to combine his DAC and his swiss knife. Even after more than 10 years of experience, Nanotechnos still collects all gear he gets, even his first MPMAN MP3 player. He likes spreadsheets, technical specs and all this amazing(ly boring) numbers. But most of all, he loves music: electro, classical, dubstep, Debussy : the daily playlist.


  • Reply April 29, 2023

    William Aitchison

    Hi….many thanks for this superb review, I have a FiiO M15S (previous was an M11 ESS) and this M15S is MUCH better and I agree with every word of the review….I waited ages for this Mark II M15 and I am not disappointed….
    Interestingly I also have the A & K PA10 and agree with the reviewer, it lifts the audio quality to another level…..a word of caution though, I found using the A &K supplied unbalanced jumper cable not that good but going to a 4.4mm to 4.4mm balanced connector ( as shown in the review) made a substantial difference the the sound quality and I’m surprised A & K did not include one considering the cost ay the PA10 and the very modest cost of the jumper cable.
    That said, the FiiO M15S is the best FiiO I’ve had yet (and I’ve had a few!) and once again thank you for a great review.
    Happy listening!!

  • Reply May 1, 2023

    Gregory David

    Thanks for the review! Question, I would like to use the M15s as a transport from 3.5 mm to COAX, not the USB. Did you try out this function?



  • Reply May 16, 2023


    what is up with all these black and white photos? You really cant get a good feel or look at the player doing that.

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