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FiiO KA11 Dongle DAC/Amp vs Douk Audio U3 Mini Headphone Amp

Buy the FiiO KA11 if you listen from a phone, tablet or laptop and want one cable that does everything. It is a USB-C DAC and headphone amp in one 8.5 g stick, with a clean CS43131 chip and enough power for most IEMs and efficient headphones. The Douk Audio U3 is a different tool: a desktop Class A amp that takes RCA input and needs its own power supply. It drives high-impedance headphones like the HD600 with far more power, but owners report hiss unless it runs on 16-18 V, and the jack and volume knob feel cheap.

  • Choose the FiiO KA11 if you want a pocketable USB-C DAC/amp for a phone or laptop and your headphones are easy to drive.
  • Choose the Douk Audio U3 if you already have a DAC or line-level source and need a desktop amp with real power for 300-600 ohm headphones.

Prices

  • FiiO KA11 Dongle DAC/Amp: $25.99 at Apos (last seen Nov 9)
  • Douk Audio U3 Mini Headphone Amp: $36.99 at Douk Audio (last seen Nov 10)
  • Difference: the FiiO KA11 Dongle DAC/Amp is $11.00 cheaper than the Douk Audio U3 Mini Headphone Amp at the latest prices (Nov 9 and Nov 10)
FiiO
FiiO KA11 Dongle DAC/Headphone Amplifier

FiiO KA11 Dongle DAC/Amp

FiiO KA11 Dongle DAC/Headphone Amplifier

4(1 rating)
$25.99at AposChecked Nov 9
See all prices and details
Visit Apos
Pros
  • One-cable USB-C hookup for phones, tablets and laptops
  • Very low distortion and high SNR for clean detail
  • Small and light enough to hang from a phone
  • Handles DSD256 and 32-bit/384 kHz files
Cons
  • 22 mW at 300 ohms is thin for high-impedance headphones
  • No analog input, so it cannot sit behind a separate DAC
  • No volume control or gain switch
Douk Audio
Douk Audio U3 Mini Class A Headphone Amplifier

Douk Audio U3 Mini Headphone Amp

Douk Audio U3 Mini Class A Headphone Amplifier

4.1(21 ratings)
$36.99at Douk AudioChecked 15 h ago
See all prices and details
Visit Douk Audio
Pros
  • Class A output with strong drive for 300-600 ohm headphones
  • Socketed op-amp invites swapping and tuning
  • RCA input fits a desk setup with a separate DAC
  • Wide 5-20 V input range
Cons
  • No power supply included, and a good one matters
  • Owners report hiss unless run at 16-18 V
  • Reports of a scratchy volume knob and an intermittent jack
  • No digital input and no DAC built in

What separates them

FiiO KA11 Dongle DAC/AmpDouk Audio U3 Mini Headphone Amp
RoleUSB-C DAC and headphone amp in oneAnalog headphone amp only, needs an RCA source
Power at 32 ohms200 mW per channel1300 mW or more
Power at 300 ohms22 mW per channelHigh 26 V rail, built for 300-600 ohm loads
SetupPlug into USB-C, no power adapterNeeds a separate DC 5-20 V supply, not included
Size and weight44.5 x 10.5 x 9.7 mm, 8.5 g67 x 93 x 30 mm, 169 g
Noise125 dB SNR, THD+N under 0.0006%110 dB SNR, owners report hiss below 16-18 V
Op-ampFixed SGM8262Socketed TI-NE5532, swappable
Build and controlsSealed dongle, no controlsMetal case, stepped volume knob, 6.35 mm jack

Price history

  • FiiO KA11 Dongle DAC/Amp: lowest $32.99 on Nov 10 at Best Buy.
  • Douk Audio U3 Mini Headphone Amp: lowest $36.99 on Nov 10 at Amazon.

Prices at every store

FiiO KA11 Dongle DAC/Amp

  • AposNew

    In stockReturn policy

    $25.99Checked Nov 9
    Visit Apos
  • Best BuyNew

    In stock

    $32.99Free shippingChecked 15 h ago
    Visit Best Buy
  • AposNew

    In stock

    $32.99Free shippingChecked 15 h ago
    Visit Apos
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $32.99Checked 15 h ago
    Visit Amazon
All 6 stores and price history →

Douk Audio U3 Mini Headphone Amp

  • Douk AudioNew

    In stockReturn policy

    $36.99Checked 15 h ago
    Visit Douk Audio
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $36.99Free shippingChecked 15 h ago
    Visit Amazon
All 2 stores and price history →

Specs compared

SpecFiiO KA11 Dongle DAC/AmpDouk Audio U3 Mini Headphone Amp
Op-ampSGM8262TI-NE5532
Signal-to-noise ratio125 dB≥110DB
Dimensions44.5 x 10.5 x 9.7 mm67*93*30mm / 2.64*3.66*1.18in
Audio inputUSB 3.0 Type C Malestereo L/R RCA
DAC chipCS43131—
Max resolution32 bits / 384 kHz—
DSD supportDSD256—
Output power 16Ω245 mW + 245 mW—
Output power 32Ω200 mW + 200 mW—
Output power 300Ω22 mW + 22 mW—
THD+Nless than 0.0006%—
Weight8.5 g—
Show all 20 specsShow fewer specs
SpecFiiO KA11 Dongle DAC/AmpDouk Audio U3 Mini Headphone Amp
Audio output—6.35mm headphone jack (with 6.35mm to 3.5mm ada…
Output power—≥1300mW (32Ω)
Headphone impedance—18-600Ω
Frequency response—20-30KHz
Max output amplitude voltage—26V
Input voltage—DC 5-20V
Net weight—169g / 0.37lb
Package weight—310g / 0.68lb

What reviewers say

FiiO KA11 Dongle DAC/Amp

Owners and reviewers generally rate the KA11 as one of the stronger budget USB-C dongles, praising its power, low noise and clean detail for the size. Common complaints are the lack of controls, phone battery drain and limited headroom with high-impedance headphones.

What people mention
  • Output powerPraisedOwners say it drives most IEMs and efficient headphones with headroom to spare.
  • Noise floorPraisedListeners report a quiet background and clean detail in quiet passages.
  • Build and cablePraisedThe braided cable and small metal body feel durable for a dongle.
  • Phone batteryCriticisedSome owners say long listening sessions drain the phone faster than expected.

Douk Audio U3 Mini Headphone Amp

  • 4.1 / 521 ratings

Buyers with 21 ratings average 4.1 out of 5. Most like the gain, warmth and size for the money, but the amp is picky about its power supply and build quality is inconsistent.

What people mention
  • Power supplyCriticisedOwners say it hisses unless fed 16-18V, and no suitable supply is included.
  • Sound qualityPraisedBuyers describe warm, full sound with good gain and detail for the size.
  • Build qualityCriticisedThe stepped volume knob feels cheap and scratchy, and one jack went intermittent after weeks of light use.

Questions and answers

Which is better for high-impedance headphones like the HD600?
The Douk U3. Its 26 V rail and Class A output are built for 300-600 ohm loads, while the KA11 puts out only 22 mW at 300 ohms. The KA11 is fine for IEMs and efficient headphones.
Can I use the Douk U3 with my phone?
Not directly. It takes stereo RCA input, so you need a source with line output or a separate DAC. The KA11 plugs straight into a phone's USB-C port.
Which one is quieter?
The KA11. Its 125 dB SNR and 0.0006% THD+N are clean by design. U3 owners report audible hiss unless it runs on a 16-18 V supply.
Is the U3 worth stepping up to from a dongle?
Only if you have hard-to-drive headphones and a desk setup with a DAC. For portable listening the KA11 is the more practical pick.
Which lasts longer?
The KA11 has no moving parts and a sealed cable. The U3 has a stepped volume knob and a 6.35 mm jack that some owners report failing after weeks of light use.
Does the U3 come with everything I need?
No. It ships with a USB-to-DC cable and a 6.35 mm to 3.5 mm adapter, but no power adapter. Plan on a quality supply above 5 W.

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Buying guides that pick them

  • Best headphone amplifiers under $45
  • Headphone drivePraisedIt handles high-impedance models like the HD600 and K701 that phones and laptops struggle with.