FiiO KA15 review: a delightfully retro DAC dongle that packs a powerful punch

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FiiO KA15: Two-minute review

Is this little teal DAC one of the best headphone DACs around? You bet it is. The FiiO KA15 is the successor to the popular FiiO KA13, and it adds a small color display with a fun audio cassette-style animation during playback. It has high power output in desktop mode that enables it to drive even fairly demanding headphones, and it has both 4.4mm balanced and 3.5mm headphone outputs. The 3.5mm can also be used as an audio output.

GO Link Max DAC, for example. But the combination of low cost and high power output makes the FiiO KA15 very attractive. (As does the fact that it looks like a tiny cassette Walkman. And I stand by that.)

FiiO KA15 review: Features

A photo of the front of the FiiO KA15 portable DAC playing PCM music — (Image credit: Future)

DSD256 and 768kHz/32-bit PCM support
Dual Cirrus CS43198 DACs and SGM8262 op-amps
Unbalanced 3.5mm and balanced 4.4mm outputs

The KA15 features dual Cirrus CS43198 DACS and dual SG Micro SGM8262 op-amps. It supports decoding of PCM audio up to 768kHz/32bit and DSD256 and has both 3.5mm and 4.4mm balanced outputs designed for headphones with impedances of up to 150 ohms and 300 ohms respectively.

You can toggle key settings such as EQ presets and amp modes via the display and physical buttons, but EQ is best left to the Android app or web control panel where you can also set a 10-band parametric EQ. I’ve written more about that in the “ease of use and setup” section.

The USB-C audio is switchable between UAC 1.0 and 2.0 for the widest possible compatibility, enabling the KA15 to work not just with smartphones, tablets and laptops but also handheld games consoles and older hardware.

The KA15 runs in two modes: normal and desktop mode. Desktop mode enables it to deliver considerably more power but, as the KA15 takes all of its power from the device it’s connected to, that mode is best suited to mains-powered devices such as desktop PCs and laptops that aren’t running on battery.

In normal mode the KA15 can deliver 50mW per channel into 32 ohms on the 3.5mm output and 170mW on the balanced output. In desktop mode both increase to 180mW per channel and 560mW respectively.

There are a lot of control options to choose from, including: ten EQ presets (three of which are for FiiO IEMs); Class H / Class A/B switching; channel balance; display brightness; display themes; display rotation; and five filters. The filters are non-OS (non-oversampling), Fast-LL (low latency), Fast-PC (phase compensated), Slow-LL, and Slow-PC. The fast filters are recommended for dynamic music and gaming and the slow ones for more complex listening.

Features score: 5 / 5

FiiO KA15 review: Sound quality

The web-based control panel for the FiiO KA15 portable DAC — iPhone users will need to turn to their computer to create personalized EQs. (Image credit: Future)

Excellent warmth, detail and clarity, especially in desktop mode
Customizable amplification and filtering
You may need a computer to customize the EQ

If you’re currently listening to your computer’s headphone output or have a simple headphone dongle on your phone or tablet, the FiiO KA15 is a significant audio upgrade – especially if you use it on a computer and have it set to desktop mode, which massively increases the output power.

The FiiO KA15 has a neutral sound signature with clean, punchy but not overly exaggerated bass, and you can adjust both the amplification mode and the audio filter settings to suit your preferences. I liked it best in Class A/B mode with filtering set to Slow-PC and the EQ off, which I felt was warmer and slightly more spacious than Class H, fast filtering and any of the preset EQs. However, the lack of an iPhone app or on-board EQ customization was an irritant on IEMs, where many vocals were too sibilant as I turned the volume level up.

Despite listening across multiple genres and decades of music I didn’t feel the need to change the EQ or filters with my closed- or open-back over-ears: whether it was U2’s 30th anniversary remaster of Achtung Baby, Stevie Wonder’s Superstition, Little Simz’ Point and Kill, Talk Talk’s New Grass or Robyn’s Dopamine I had tremendous fun listening loud, hearing previously buried elements in every mix and only encountering distortion around the low end at unsafe listening levels.

The FiiO delivered excellent clarity and detail across genres. The aforementioned Little Simz track was a great example, a thrilling mix of snaking bassline and beautifully close voices; when the backing vocals came in in the second verse my goosebumps got goosebumps.

Sound quality: 5 / 5

FiiO KA15 review: Design

FiiO KA15 portable DAC photographed from the front to show the user interface — (Image credit: Future)

Brushed aluminum with small color LCD
152 x 25 x 11mm (HxWxD)
21g and in case I didn’t mention, it looks like a tiny cassette Walkman

The KA15 is slightly smaller than its more powerful sibling, the KA17, and it is a little bit smaller than a standard 9V rectangular battery. Its dimensions are 152mm x 25mm x 11mm and it weighs a titchy 21g, and it comes in a choice of two brushed aluminium finishes: black and a silver/turquoise mix.

Both versions have a large black lozenge on the front with a small 0.96-inch rectangular color LCD display embedded in the centre, and both feature a delightful animation that makes the display mimic a cassette tape complete with moving reels. You can change its colours in the KA15’s theme menu. It comes with an extremely short USB-C to USB-C cable designed for use with a phone, and there’s an optional MagSafe clip that can snap it to the back of one.

The KA15 looks and feels well-made, and its design is very minimal. There are three tactile buttons on top for navigating the screen and a toggle switch for desktop mode that feels solid. The USB port is on the bottom and the 3.5mm single-ended and balanced 4.4mm outputs are on top. The single-ended output is also switchable to S/PDIF.

Design score: 5 / 5

FiiO KA15 Review: Usability and setup

Plug it in and you’re good to go
Interface can be a little fiddly
No iPhone app

The stripped-back design does mean the KA15 is a little fiddly to configure: there are just three buttons taking care of everything. If you hold the KA15 upright, the topmost button is volume up, the middle button is volume down and the lower button is play/pause. Tap that button twice to turn the display on and off, and long-press it to go into the KA15’s settings. In that mode the volume buttons move you left and right through menu items and the lower button cycles through each section and confirms your selections.

There is one big problem with the KA15 if you’re using it with an iPhone or iPad: you can’t customize its 10-band equalizer from the on-board menus, and FiiO’s companion iOS app doesn’t work with the KA15. That means for iPhone/iPad users you’ll need to plug your device into a Mac or PC and use the FiiO Control webpage in a browser such as Opera (Safari on Mac doesn’t support the necessary hardware control). This web page enables you to create personal EQs and if you wish, to share your creations with others and vice-versa. It also enables you to download any firmware updates in a process that took me less than one minute.

If you’re using a Mac and intend to listen to Hi-Res Audio you’ll need to enable higher quality USB output via the Audio MIDI Setup app in your Applications > Utilities folder or your KA15 will be limited to 48kHz audio.

Usability and setup score: 4 / 5

FiiO KA15 review: Value

It’s cheap and it’ll make you cheerful
A significant audio upgrade for smartphones and computers

If like me you have big audio ambitions and a very small budget, the KA15 is excellent value for money. It’s a significant upgrade in sound quality for smartphones and computers, and while it’s not as powerful as a desktop headphone amp it has more than enough oomph for a wide range of headphones and IEMs so it’s fairly future-proof.

Value score: 5 / 5

Should I buy the FiiO KA15?

Swipe to scroll horizontally

Attributes	Notes	Rating
Features	Lots of customization options and wide compatibility	5/5
Design	Solid and portable with tactile controls	5/5
Sound quality	Warm, detailed and crystal clear. Desktop mode is superb.	5/5
Value	A big upgrade with a relatively small price tag	5/5

iFi GO Link Max is even more compact than the KA15, and it’s cheaper too. It puts out up to 241mW of power and features dual Sabre DACs.

FiiO makes plenty of other DACs, and if you need something with a higher spec than the KA15 the next step up is the FiiO KA17. That’s roughly 30% more expensive and boasts dual ESS ES9069 DACs, maximum output of 650mW per channel and support for DSD512.

Want something just as small and almost as retro-cute, but wireless? Look to the matchbox-sized iFi Go Blu Air.

How I tested the FiiO KA15

Hi-Res FLAC and multitrack Logic Pro projects
Lossless and lossy streaming
Beyerdynamic and Philips over-ears, Soundmagic IEMS

I tested the iFi KA15 over two weeks with a variety of headphones and IEMs including BeyerDynamic DT990 Pro and Philips Fidelio X2HR open-back headphones, DT770 closed-back headphones, and SoundMagic E11C IEMs.

I tested the DAC with music from multiple audio sources including hi-res FLAC files via the Vox music player on Mac; lossy and lossless streaming on desktop, iPhones and iPad; and my own multitrack Logic Pro X music projects.

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