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FiiO KA11 Dongle DAC/Amp vs Fosi Audio PH04 Headphone Amplifier

These are different tools, not rivals. The FiiO KA11 is a USB-C dongle DAC/amp that improves headphone sound from a phone, tablet or laptop, and it drives hard-to-power headphones with 200 mW at 32 ohms. The Fosi Audio PH04 is a four-output splitter amp for sharing one stereo source with up to four listeners, each with their own volume knob, and its 40 mW at 100 ohms is modest. Buy the KA11 for personal listening quality; buy the PH04 for group monitoring.

  • Choose the FiiO KA11 if you want cleaner, louder sound from a phone or laptop and your headphones need real power.
  • Choose the Fosi Audio PH04 if several people must listen to one source at once, each with separate volume control.

Prices

  • FiiO KA11 Dongle DAC/Amp: $25.99 at Apos (last seen Nov 9)
  • Fosi Audio PH04 Headphone Amplifier: $29.99 at Suncoast Audio Direct (last seen Nov 10)
  • Difference: the FiiO KA11 Dongle DAC/Amp is $4.00 cheaper than the Fosi Audio PH04 Headphone Amplifier 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
  • Strong output for a dongle, enough for many high-impedance headphones
  • Very low distortion and high signal-to-noise ratio
  • Tiny and light, hangs from a phone without strain
  • Supports hi-res PCM and DSD256
  • Braided cable with silicone jacket holds up to daily use
Cons
  • Only one headphone output
  • USB-C only, so Lightning or USB-A devices need an adapter
  • No volume buttons or gain switch on the body
  • Draws power from the host device
Fosi Audio
Fosi Audio PH04 4 Channel Headphone Amplifier

Fosi Audio PH04 Headphone Amplifier

Fosi Audio PH04 4 Channel Headphone Amplifier

5(4 ratings)
$29.99at Suncoast Audio DirectChecked 16 h ago
See all prices and details
Visit Suncoast Audio Direct
Pros
  • Four outputs with separate volume knobs
  • Simple 3.5mm input and outputs, no adapters needed
  • Works well for studio tracking, stage and shared TV listening
  • Powered by its own adapter, so it does not drain a phone
  • Metal body and 18-month warranty
Cons
  • Low output power, so it suits easy-to-drive headphones
  • No DAC, it needs an analog source
  • No published noise or distortion specs
  • 3.5mm jacks only, no 6.35mm or balanced options

What separates them

FiiO KA11 Dongle DAC/AmpFosi Audio PH04 Headphone Amplifier
RoleUSB-C DAC and headphone amp for one listenerFour-channel headphone distribution amp for up to four listeners
Power output245 mW at 16 ohms, 200 mW at 32 ohms, 22 mW at 300 ohms40 mW at 100 ohms
OutputsOne 3.5mm headphone outputFour 3.5mm outputs with individual volume knobs
Source connectionUSB-C digital input from phone, tablet or computer3.5mm analog stereo input
Resolution and format support32-bit/384 kHz PCM and DSD256Analog only, no DAC section
Noise and distortion specs125 dB SNR, THD+N under 0.0006%No published SNR or THD figures
Power sourceBus-powered from the USB hostExternal 12V 1.5A adapter
Size and weight44.5 x 10.5 x 9.7 mm, 8.5 g175 g, desktop unit

Price history

  • FiiO KA11 Dongle DAC/Amp: lowest $32.99 on Nov 10 at Best Buy.
  • Fosi Audio PH04 Headphone Amplifier: lowest $32.99 on Nov 10 at Fosi Audio.

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 →

Fosi Audio PH04 Headphone Amplifier

  • Suncoast Audio DirectNew

    In stockReturn policy

    $29.99Checked 16 h ago
    Visit Suncoast Audio Direct
  • Fosi AudioNew

    In stockReturn policy

    $32.99Checked 16 h ago
    Visit Fosi Audio
  • buynbuy storeNew

    In stockReturn policy

    $51.99Checked 16 h ago
    Visit buynbuy store
  • AmazonNew

    Availability unknown

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

    $32.99Checked 16 h ago
    Visit Amazon

Also available at

  • Fosi AudioCheck price at Fosi Audio
All 8 stores and price history →

Specs compared

SpecFiiO KA11 Dongle DAC/AmpFosi Audio PH04 Headphone Amplifier
DAC chipCS43131—
Op-ampSGM8262—
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—
Signal-to-noise ratio125 dB—
THD+Nless than 0.0006%—
Dimensions44.5 x 10.5 x 9.7 mm—
Weight8.5 g—
Audio inputUSB 3.0 Type C Male—
Show all 23 specsShow fewer specs
SpecFiiO KA11 Dongle DAC/AmpFosi Audio PH04 Headphone Amplifier
Model—PH04
Input Mode—1/8'' headphone, stereo
Output Mode—1/8'' headphone, stereo
Input Impedance—100 Ω
Output Impedance—80 Ω
Max. Input level—+15dBu
Max. Output level—40mW in 100 Ω
Device Weight—175g
Power Supply—12V 1.5A
Channels

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.

Fosi Audio PH04 Headphone Amplifier

Owners who wrote about the PH04 describe it working well and delivering good quality, including with a Brennan B2 as the source. Feedback is limited, but the tone is positive.

What people mention
  • Sound qualityPraisedOwners say it delivers good, clean stereo sound.
  • CompatibilityPraisedIt works well with sources like the Brennan B2 and with 3.5mm headphones.
  • BuildPraisedThe compact metal case is described as tidy and portable.
  • Long-term useMixedFew owners report on durability over time.

Questions and answers

Which is better for improving sound from a phone?
The FiiO KA11. It is a DAC and amp in one, so it bypasses the phone's built-in audio and adds real power. The PH04 only splits an analog signal and adds no digital conversion.
Which one drives high-impedance headphones better?
The KA11. It delivers 22 mW at 300 ohms and 200 mW at 32 ohms. The PH04 tops out at 40 mW at 100 ohms, which suits sensitive headphones only.
Can the PH04 replace a dongle DAC?
No. It has no USB input and no DAC, so it needs an analog 3.5mm source. It is meant to share that source among several headphones.
Which is more portable?
The KA11. At 8.5 g it clips to a phone and needs no power adapter. The PH04 is a 175 g desktop unit with a 12V power supply.
Is the PH04 worth it for a single listener?
Rarely. Its value is the four independent volume knobs. One listener is better served by the KA11's cleaner, more powerful output.
Which lasts longer?
Both are solid for their class. The KA11's cable and USB-C plug take daily wear, while the PH04's metal chassis and external power make it the sturdier desk fixture.

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More comparisons

  • FiiO KA11 Dongle DAC/Headphone Amplifier vs Douk Audio U3 Mini Class A Headphone Amplifier
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  • Fosi Audio PH04 4 Channel Headphone Amplifier vs Douk Audio U3 Mini Class A Headphone Amplifier
  • Neoteck Portable 3.5mm Headphone Amplifier with Bluetooth 5.0 Receiver, Two-Stage Gain Switch, 16-300 Ohm HiFi Earphone Amp, Aluminum Matte Surface vs Fosi Audio PH04 4 Channel Headphone Amplifier

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Input/Output Jack—3.5mm