DAC / AmpOverreview

FiiO KA15

Name: FiiO KA15
Brand: FiiO

A 21-gram cassette deck that out-measured every dongle on the bench — then needed a firmware update to close the argument about it.

13 sourcesUpdated 2026-09-01

$100Typical US price

Score aggregates reviewer opinions across topics.

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The short version

What to know.

A roughly $100 USB-C dongle DAC/amp with an unusual amount of machinery in it: dual CS43198 converters, a colour screen with an on-device menu, a ten-band parametric EQ that runs on the hardware, single-ended and balanced outputs, and a desktop-mode switch. Sources agree on the build — machined aluminium with tight fit and finish — on the depth of the feature set for the money, and on the value. They divide on three things. Power splits along an operating boundary rather than a preference: in desktop mode on balanced it measured the highest output of any dongle on its reviewer's bench, while in phone mode, single-ended, or into 300-ohm headphones it runs short, and the reviewers who call it underpowered are all listening there. Noise splits by gear: dead quiet on ordinary headphones, a faint floor on very sensitive IEMs, and a loud pop on stop for at least one owner feeding powered monitors. And voicing splits the usual way — most hear a mild warm, mid-bass-forward tilt, a minority hear it as neutral or slightly lean. One more thing belongs in any buying decision: the low-level distortion that dominated the technical coverage was real, was measured, and was fixed by FiiO's V1.0.5 firmware, so an out-of-date unit and an updated one are not the same device.

About this product

The successor to the KA5, sitting below the KA17 in FiiO's dongle line. It wears Jade Audio branding on the chassis but is sold and supported as a FiiO product. Not the screenless KA13 (same dual CS43198), not the single-chip KA11, and not the ES9069Q-based KA17. Behaviour depends on firmware: units on V1.0.5 or later carry the DRE toggle discussed below.

FiiO's KA15 is a USB-C dongle DAC and headphone amplifier about the size of a stick of gum: 52 × 25 × 11 mm, 21 grams, machined aluminium, with a 0.96-inch colour screen that animates a spinning cassette while music plays. Inside are two Cirrus CS43198 converters and two SGM8262 op-amps; outside are a 3.5 mm output that doubles as S/PDIF, a 4.4 mm balanced output, a ten-band parametric equaliser you can set from the device itself, five reconstruction filters, two amplifier classes, and a sliding desktop mode switch that trades your host's battery for a great deal more output.

It arrived in September 2024 to a warm press reception and then, in May 2025, to a bench review that took it apart. The measured output power turned out to be the highest of any portable USB DAC/amp its reviewer had tested; the measured behaviour at low signal levels turned out to carry a distortion artifact common to its converter family, and he said so plainly. FiiO answered with a firmware option, the artifact went away, and what is left to argue about is where all that power stops and whether the thing has a voice.

A good fit for

Anyone who wants hardware parametric EQ they can carry, especially on Android or a computer
IEM and easy-headphone listeners who want desktop-level loudness out of a phone or laptop
People who want a 4.4 mm balanced output in something that fits in a coin pocket
Tinkerers who will actually use the filters, amp classes, and on-device menu

Think twice if

You listen mainly on 300-ohm headphones or hungry planars — this is not the amplifier for them
You are an iPhone or iPad user who wants to set the EQ from the phone itself
You need full output while running off phone battery rather than a mains-powered host
You want a plug-in-and-forget dongle with no menus to learn

The reviewer consensus

Agreement &
disagreement.

3 / 7topics divide opinion

2 Strong agreement2 Mostly agree3 Divided opinions

Common ground5

Build is well beyond the price — machined aluminium, tight fit and finish, satisfying buttons, case included
An unusually deep feature set for a dongle: on-device menu, ten-band hardware parametric EQ, five filters, two amp classes, S/PDIF out
Genuinely pocketable at 52 × 25 × 11 mm and 21 grams, with both 3.5 mm and 4.4 mm outputs
At normal listening levels the measured performance is desktop-grade from both outputs
A lot of device for roughly $100 — the value verdict is close to unanimous

Points of contention4

How much power it really has: record-setting in balanced desktop mode, thin in phone mode and into 300-ohm loads
How quiet it is: silent on most gear, but a faint floor on very sensitive IEMs and a loud pop on stop into powered monitors
Whether it has a voice: a mild warm, mid-bass-forward tilt for most, neutral or slightly lean for a minority
Whether switching between Class A/B and Class H changes anything audible — reviewers prefer opposite settings, and one detects no difference at all

A closer listen.

7 topics · 3 divided

Left: criticalRight: positiveTighter lines: more agreement

Choose a topic

Power

PositiveDivided opinions

Reviewer sentiment7 supporting sources

CriticalNeutralPositive

Band: opinion spread · Dot: weighted average

Sources split, and the split is a boundary rather than a matter of taste. With the desktop switch on and headphones on the 4.4 mm output, the measured figures are extraordinary for something this size and every source in that condition says so. Slide the switch off, use the 3.5 mm jack, or plug in 300-ohm headphones and the numbers collapse — and the two reviewers who found it wanting were all listening in exactly those conditions. Nobody is contradicting anybody; they are describing different halves of the same device.

Measured

ASR measured 174 mW into 32 ohms single-ended and 548 mW balanced, both channels driven, in desktop mode — the highest output of any portable USB DAC/amp tested there at the time. FiiO's own published figures for the same unit fall to 19 mW single-ended and 78 mW balanced into 300 ohms, and phone mode drops to 50 mW single-ended and 170 mW balanced into 32 ohms.

vs. listeners — The bench and the complaints do not actually disagree. The record-setting number is the balanced desktop-mode figure into a 32-ohm load; the reviewers who ran out of power were on 300-ohm headphones or in phone mode, where the published figures are an order of magnitude lower.

Where it splits

in desktop mode on balanced, the output is extraordinary for the size70%

“Output power from this small device is incredible. This is the record-shattering, highest-output portable USB DAC/headphone amp among the devices tested at ASR so far.”
jkim · Audio Science Review

it hits a ceiling — phone mode is thin and high-impedance loads outrun it30%

“the KA15 will get loud enough for normal listening volumes, but not enough to properly extract necessary performance in single ended mode”
Durwood · Audioreviews

Link to this topic

Transparency

PositiveDivided opinions

Reviewer sentiment11 supporting sources

CriticalNeutralPositive

Band: opinion spread · Dot: weighted average

Sources split on whether the KA15 adds anything you can hear. The larger group reports a mild warm tilt — a thickened mid-bass that follows FiiO's house voicing and reads as smooth rather than coloured; a smaller group hears it as neutral, and one reviewer comparing it against a rival built on the same converter puts it on the leaner, brighter side instead. The one thing measurement can settle it did settle, twice over: the bench found the KA15 desktop-grade at normal signal levels, then found a genuine defect at low ones, and then found the defect gone after a firmware fix.

Measured

ASR's bench found desktop-class distortion figures from both outputs at normal levels, a flat response at 44.1 and 96 kHz sample rates, and jitter errors its reviewer judged inaudible. It also found that the converter's Dynamic Range Enhancement lifted total distortion and noise across a wide band of low signal levels — a rise the reviewer named the "Cirrus hump", peaking around 0.06% in the worst case. FiiO's V1.0.5 firmware added a DRE on/off toggle and dropped the activation threshold from the chip default of -12 dBFS to -44 dBFS; re-measured, the reviewer reported no DRE artifacts in either mode.

vs. listeners — Two tensions, not one. The post-firmware measurements say the KA15 is effectively transparent, yet four sources independently describe a warm, mid-bass-forward tilt the bench does not show. And while the defect the bench did find was real, listeners disagreed about hearing it: the reviewer who measured it reported an occasional crunch he could pick out, while another member A/B-ing the same Hans Zimmer cue against a second DAC reported no difference at any level.

Where it splits

a mild warm tilt — thicker mid-bass, smooth rather than neutral65%

“With a warm-leaning sound, the KA15 is smooth and detailed with excellent extension”
Thomas · Headfonics

neutral, or if anything leaner and brighter than its rivals35%

“If one prefers shimmering treble and less bass pull, opt for the FiiO KA15.”
Durwood · Audioreviews

Link to this topic

The hardware

Specifications.

Checked 2026-09-22

Design

Form factor: Dongle
DAC: CS43198 ×2 · Delta-sigma
PCM: 32-bit
DSD: DSD256
Amplifier: Solid-state

Output

Output power: Single-ended: 290 mW @ 16 Ω · 180 mW @ 32 Ω · 19 mW @ 300 ΩBalanced: 510 mW @ 16 Ω · 560 mW @ 32 Ω · 78 mW @ 300 Ω
Output impedance: < 0.8 Ω SE · < 1.2 Ω bal.
Volume: Digital
Signal-to-noise: 123 dB

Connection

Digital inputs: USB-C
Headphone outputs: 3.5 mm, 4.4 mm
Power: USB bus power

Physical

Weight: 21 g
Dimensions: 52 × 25 × 11 mm

Manufacturer-published figures, not measurements · from fiio.com.

Follow the evidence

Sources 13

Read with context

Limitations & method.

As of 2026-09-01

What to keep in mind 7

A read of where the reviews land as of September 2026. The dongle field turns over quickly, and rivals launched since this one will have shifted the comparisons.
Firmware matters more than usual here. The low-level distortion that dominated the technical coverage was addressed by FiiO in 2025, so a unit still on old firmware and an updated one do not behave the same — it is worth checking the version before judging one you have borrowed or bought used.
Almost every published review worked from a unit the maker supplied. That field tends to read more warmly than the buying public does, which is part of why the owner ratings sit lower than the review scores.
Owner star ratings skew positive, since they mostly come from people who chose to buy it.
How much power you need is worth checking against your own headphones rather than the summary. Impressions here track the load: someone with 300-ohm headphones is describing a different device than someone with IEMs.
If you use an iPhone or iPad, expect a noticeably different experience from the Android and Windows reviewers — the equaliser is not reachable from the phone.
Prices quoted across these reviews range from $89 to $126 as the street price moved; the figure here is what two US dealers were asking as this was written.

Where to buy Product & retailer links

FiiO KA15 Amazon

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FiiO KA15

How the score adds up

What to know.

A good fit for

Think twice if

Agreement &
disagreement.

Common ground5

Points of contention4

A closer listen.

Power

Measured

Noise

Measured

Transparency

Measured

Features

Ergonomics

Build

Value

Specifications.

Design

Output

Connection

Physical

Sources 13

Limitations & method.

What to keep in mind 7