Beyerdynamic
FiiO
FiiO K11 R2R Desktop DAC & Headphone Amplifier – 24-Bit R2R
The FiiO K11 R2R combines a fully differential 24-bit R2R DAC with NOS/OS modes, 4.4mm balanced and 6.35mm headphone outputs. Balanced power reaches 1300mW per channel at 32Ω in OS mode with THD+N below 1%. USB-C, optical and coaxial inputs, stereo RCA output, three gain levels and an LCD display make it a versatile desktop listening solution in Black or Silver.
Color
Overview
DESKTOP DAC & HEADPHONE AMPLIFIER
FiiO K11 R2R
Build your desktop listening setup around a fully differential 24-bit R2R DAC. The FiiO K11 R2R combines a discrete resistor array, selectable NOS and OS processing, and dedicated headphone amplification in one compact unit. Explore this model at AX Store in Kuwait.
Connect digital sources through USB-C, optical or coaxial, then listen through the front headphone sockets or feed a powered-speaker system through the rear RCA outputs. Choose Black or Silver to suit your desk.
24-Bit R2R
Fully Differential Conversion
192 Resistors
Precision Discrete Array
NOS / OS
Selectable Processing Modes
1300mW
Per Channel, Balanced at 32Ω
OS mode, THD+N <1%
Black or Silver
Black
A dark finish for your desktop audio setup.
Silver
A lighter finish with the same R2R features.
Discrete 24-Bit R2R Conversion
The K11 R2R uses 192 precision thin-film resistors arranged in a fully differential conversion circuit. These resistors have a 0.1% tolerance, forming the ladder that converts digital audio into an analog signal.
This resistor-array architecture is the defining feature of the K11 R2R, with two processing modes that let you explore how your music is handled before conversion.
Two Ways to Process Your Music
NOS — Non-Oversampling
NOS keeps the incoming sampling rate for conversion. Select it when you want to listen without the additional oversampling stage.
OS — Oversampling
OS processes audio at 384kHz before it reaches the R2R conversion stage. Switch between modes using familiar tracks to find your preferred presentation.
Balanced and Single-Ended Headphone Outputs
The front panel provides a 6.35mm single-ended socket and a 4.4mm balanced socket. Use the connection that matches your headphone cable, with a cable wired for balanced operation when using 4.4mm.
At 32Ω in OS mode, output is rated at least 1300mW per channel balanced and 460mW per channel single-ended, both with THD+N below 1%.
Three Gain Levels
Low, Medium and High gain help you find a useful volume adjustment range for different headphones. FiiO recommends 8–150Ω headphones for the single-ended output and 8–350Ω for balanced output.
Electronic Volume Control
The NJW1195A electronic volume controller works with the front knob for convenient level adjustment. Start at a low volume when connecting headphones or changing gain.
Connect Your Digital Sources
USB-C
Connect a compatible computer or USB audio source. USB accepts PCM streams up to 384kHz/32-bit and supports DSD256 with a compatible Native output configuration.
Optical
Use a compatible optical digital source for PCM playback up to 96kHz/24-bit.
Coaxial
Coaxial input supports PCM up to 192kHz/24-bit. The coaxial connection can also provide digital output when USB input mode is selected.
USB input support and DAC conversion depth are different specifications: the resistor array performs 24-bit conversion. DSD is converted internally to PCM before reaching the R2R stage.
Headphones, Active Speakers or an External Amplifier
The rear stereo RCA outputs let the K11 R2R feed compatible active speakers or an external amplifier. PRE mode, also shown as LO SE, provides an adjustable RCA output level.
Use PO for the front headphone outputs and select the appropriate RCA mode for your speaker system. Passive speakers require a separate speaker amplifier.
Your Settings at a Glance
The front LCD shows sampling rate, volume, gain and output mode. The multifunction knob handles volume adjustment, input selection and menu settings.
The illuminated FiiO logo adds adjustable RGB lighting, with controls for colour, brightness and lighting behaviour.
USB Audio for Your PC or Mac
Select USB input on the K11 R2R, connect the data cable and choose the device as your computer's audio output. FiiO provides a USB DAC driver for Windows, while macOS playback works without an additional driver.
The available playback formats depend on your operating system, player and output configuration. USB Audio Class 1.0 and 2.0 modes are supported.
Compact Size, Dedicated Power
Measuring approximately 147 × 133 × 32.3mm including its feet, the K11 R2R fits beside a laptop, monitor or other desktop audio equipment. It weighs approximately 420g.
The included external adapter supplies DC 12V/2A power. USB-C carries digital audio, and the unit has no internal battery.
What's in the Box
- FiiO K11 R2R in the selected colour
- Power adapter
- Power cable
- USB data cable
- Headphone jack adapter
- Quick start guide
- Warranty card
Complete Your Desktop Audio Setup
- Studio Headphones — explore headphones for your listening setup.
- DACs and Headphone Amplifiers — compare connection options and amplification.
Headphones, speakers and other connected equipment are sold separately.
FiiO K11 R2R Setup Choices
Check the actual digital or analogue input, headphone connector and supported operating mode. Choose the source, cable and headphone together; a headphone amplifier and a microphone recording interface have different jobs. Explore beyerdynamic DT 990 PRO 80 Ohm Open-Back Studio Headphones, beyerdynamic DT 900 PRO X Studio Headphones 48 Ohm, beyerdynamic DT 770 PRO X Closed-Back Studio Headphones 48 Ohm. Browse the FiiO range at AX.
Frequently Asked Questions
What DAC architecture does the FiiO K11 R2R use?
It uses a fully differential 24-bit R2R DAC built from 192 precision thin-film resistors.
What is the difference between NOS and OS?
NOS keeps the incoming sampling rate for conversion. OS oversamples audio to 384kHz before the R2R conversion stage. Both modes are selectable.
How much headphone output power does it provide?
At 32Ω in OS mode, the balanced output is rated at least 1300mW per channel and the single-ended output at least 460mW per channel, both at THD+N below 1%.
Which headphone connection should I use?
Use 6.35mm for single-ended headphones or 4.4mm with a compatible balanced headphone cable. FiiO recommends 8–150Ω for the single-ended output and 8–350Ω for the balanced output.
What audio formats does it support?
USB accepts PCM up to 384kHz/32-bit and DSD256 with a compatible Native output configuration. The R2R conversion stage is 24-bit, and DSD is converted internally to PCM. Coaxial supports up to 192kHz/24-bit and optical up to 96kHz/24-bit.
Can I connect active speakers or an external amplifier?
Yes. The rear stereo RCA outputs can feed compatible active speakers or an external amplifier. PRE, also shown as LO SE, provides adjustable output. Passive speakers require a separate speaker amplifier.
Does USB-C power the K11 R2R?
No. USB-C carries digital audio. The K11 R2R requires an external DC 12V/2A power supply, with a power adapter included. It has no internal battery.
Does it work with Windows and Mac computers?
Yes. Connect through USB and select the K11 R2R as the audio output device. FiiO provides a USB DAC driver for Windows; macOS works without an additional driver. Supported formats depend on the player and output configuration.
Build Your Listening Setup with AX Store
Explore headphones, DACs and amplifiers at AX Store. For help matching your headphones and connections, contact AX Store.
THE DETAILS
Technical specifications
DAC and operation
Fully differential 24-bit R2R resistor array
192
NOS / OS
Low / Medium / High
Inputs and outputs
USB-C, optical, coaxial
6.35 mm single-ended; 4.4 mm balanced
RCA line out / preamp out
Available in USB mode
Output and formats
≥460 mW + 460 mW, THD+N <1%
≥1300 mW + 1300 mW, THD+N <1%
PCM up to 384 kHz; DSD256 with native DSD source setting
Converted internally to PCM before R2R decoding
Up to 24-bit/96 kHz optical; 24-bit/192 kHz coaxial
Desktop setup
DC 12 V / 2 A
147 × 133 × 32.3 mm, including feet
Approximately 420 g
Power adapter, power cable, USB data cable, headphone adapter, quick start guide and warranty card
Black / Silver; select your option
Headphone matching
8–150 Ohm
8–350 Ohm
RCA line output — OS mode
2.7 Vrms
Approx. 0.025% (1 kHz / 0 dB / 10 kOhm)
≥115 dB
≥107 dB
≥111 dB
<5.1 µV
6.35 mm headphone output — OS mode
≥660 + 660 mW (THD+N <1%)
≥50 + 50 mW (THD+N <1%)
<1 Ohm
11 Vp-p
<7.2 µV
≥72 dB
4.4 mm balanced output — OS mode
≥520 + 520 mW (THD+N <1%)
≥220 + 220 mW (THD+N <1%)
<1.5 Ohm
23 Vp-p
<14.1 µV
≥107 dB
Additional Product Details
FiiO
K11 R2R
Desktop DAC and Headphone Amplifier
Black / Silver
Fully differential 24-bit R2R resistor array
192 precision thin-film resistors; 0.1% tolerance
NOS / OS
384kHz
Up to 384kHz/32-bit; 24-bit R2R conversion
Up to DSD256 with compatible Native output; internally converted to PCM
Up to 96kHz/24-bit
Up to 192kHz/24-bit
Stereo RCA; adjustable PRE mode supported
Available in USB input mode only
≥1300mW per channel; OS mode, THD+N <1%
≥460mW per channel; OS mode, THD+N <1%
≥220mW per channel; OS mode, THD+N <1%
≥50mW per channel; OS mode, THD+N <1%
6.35mm: 8–150Ω / 4.4mm: 8–350Ω
Low / Medium / High
NJW1195A electronic volume controller with multifunction knob
PO / PRE (LO SE) / LO
UAC 1.0 / UAC 2.0
LCD showing sampling rate, volume, gain and output mode
Adjustable RGB FiiO logo
External DC 12V/2A; power adapter included
No internal battery
Product identification
FiiO
FIIO-K11-R2R
6953175710721
6953175710738
COMPLETE YOUR SETUP
Pairs well with
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beyerdynamic DT 900 PRO X Studio Headphones 48 Ohm
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