FIIO K11 R2R DAC Headphone Amplifier Silver

The FiiO K11 R2R, the R2R version of its cousin the K11, is a small, versatile and high-performance DAC headphone amplifier. It is based on a resistor network and audiophile components such as a GD32F303RET6 microcontroller, two TI OPA1642 OPAs, two MGM8262 amplifier chips and an R2R NJW1195A volume controller. The FiiO K11 R2R is therefore able to support sampling rates up to PCM 24bit 384kHz and native DSD up to DSD256, while delivering up to 1300mW + 1300mW @ 32 ohm on its balanced headphone output.

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FiiO K11 R2R DAC Headphone Amplifier 24bits 384kHz DSD256 Silver

FiiO K11 R2R picture

The FiiO K11 R2R, the R2R version of its cousin the K11, is a small, versatile and high-performance DAC / headphone amplifier. It is based on a resistor network and audiophile components such as a GD32F303RET6 microcontroller, two TI OPA1642 OPAs, two SGM8262 amplifier chips and an R2R NJW1195A volume controller. The FiiO K11 R2R is therefore able to support sampling rates up to PCM 24bit 384kHz and native DSD up to DSD256, while delivering up to 2x1300mW into 32 ohm on its balanced headphone output. Added to this are 3 levels of gain, enabling it to drive the majority of headphones on the market. Moreover, the DAC features NOS and OS modes for a final sound restitution adapted to all types of source and to the preference of each user. On the interface side, the K11 R2R benefits from a USB input, a Toslink optical input, a coaxial input/output, an RCA line output and, of course, two headphone outputs: single-ended 6.35mm jack and balanced 4.4mm jack. An eye-catching LCD display and illuminated logo complete the package for a pleasant aesthetic.

FiiO K11 R2R: balanced 24bit R2R DAC

The K11 R2R features two networks of 48 resistors per channel, for a total of 192 resistors, offering precise, detailed conversion of the sound signal. Its balanced architecture reduces noise and unwanted harmonics. As a high-performance DAC, it supports sampling rates up to PCM 24bit 384kHz and native DSD256 via its USB input.

FiiO K11 R2R resistance arrays

FiiO K11 R2R: R2R DAC in OS and NOS modes

NOS (Non-Oversampling) mode preserves the sampling rate of the incoming signal for authentic rendering, while OS (Oversampling) mode oversamples the incoming signal to 384kHz for superior audio performance and clear sound.

FIIO K11 R2R OS and NOS modes

FiiO K11 R2R: high-performance volume control

Featuring an NJW1195A resistor-based volume control chip, the K11 R2R is able to precisely control its output volume while preserving the signal's level of distortion and noise.

FiiO K11 R2R volume control
FiiO K11 R2R gain levels

FiiO K11 R2R: 3 adjustable gain levels

The FiiO K11 R2R's 6.35mm jack and balanced 4.4mm jack headphone outputs benefit from 3 levels of gain with adapted volume curves, enabling them to drive a large number of headphones available on the market. This makes it possible to use the K11 R2R with IEMs or headphones of either low or high sensitivity and impedance.

FiiO K11 R2R: considerable output power

With a load of 4 ohms, this small headphone amplifier DAC is capable of delivering up to 1300 mW + 1300mW on its balanced output.

FiiO K11 R2R output power

FiiO K11 R2R: an audiophile circuit

The audio signal passes through audiophile components within the K11 R2R. First, there's a USB processor, followed by an audio bridge and an FGPA leading to R2R resistor networks for digital/analog signal conversion. Next comes the amplification stage, comprising OPA1642 TI AOPs, a low-pass filter, NJW1195A volume controller and gain control, before finishing on the output stage with two SGM8262 amplifier chips. A protection circuit and anti-pop system also protect your headphones or in-ear monitors.

The Fiio K11 R2R circuit

FiiO K11 R2R: a refined appearance

The front panel of the K11 R2R features an attractive LCD display showing information about the resolution of the file being played, the volume and gain levels, and the input source.

FiiO K11 R2R screen

Illuminated logo on the top of the FiiO K11

On the top of the K11, the FiiO logo is illuminated by various LEDs whose brightness, color and light pattern animations can be adjusted.

The FiiO K11 R2R logo

FiiO K11 R2R: a low-noise power stage

The power supply stage of the FiiO K11 R2R uses no less than 17 low-noise LDO regulators and 2 DC-DC converters to supply the device's analog and digital circuits separately. The K11 R2R therefore benefits from a clean, stable power supply for its various circuits.

Fiio K11 R2R power supply stage

FiiO K11 R2R little extras

FiiO K11 connectors

High-quality connectors

FiiO K11 heat dissipation

Efficient heat dissipation

FiiO K11 R2R EMI/RFI protection

EMI/RFI protection in phosphor copper

FiiO K11 R2R overview

FiiO K11 overview
16.35mm unbalanced headphone output
2Balanced 4.4mm headphone output
3LCD display
4Multi-function button
5DC 12V 2A power supply
6USB-C input
7Toslink optical input
8Coaxial input/output
9RCA stereo line output

Technical characteristics

Specifications
Product typeDAC / Headphone amplifier
Signal processing24bit R2R
MicrocontrollerGD32F303RET6
Volume control chipNJW1195A
OPAs2x TI OPA1642
2x SGM8262
Inputs1x USB-C input
1x Toslink optical input
1x Coaxial SPDIF input/output
Outputs1x Single-ended 6.35mm headphone output
1x Balanced 4.4mm headphone output
1x RCA line output
1x SPDIF coaxial input/output
Supported sample ratesUSB: PCM up to 24bit 384kHz and native DSD up to DSD256
Toslink optical / coaxial : PCM up to 24bit 192kHz
Gain control
Volume control
ScreenLCD
Output power6.35mm headphone outputL+R ≥ 460mW+460mW @ 32 ohm THD+N=1% (High gain)
L+R ≥ 50mW+50mW @ 300 ohm THD+N=1% (High gain)
Balanced 4.4mm headphone outputL+R ≥ 1300mW+1300mW @ 32 ohm THD+N=1% (High gain)
L+R ≥ 220mW+220mW @ 300 ohm THD+N=1% (High gain)
Frequency response20Hz-50kHz
SNR≥ 115dB (A-weighted)
Noise levelSingle-ended: < 7.2uV (A-weighted)
Balanced: < 14.1uV (A-weighted)
Output impedanceSingle-ended: < 1 ohm (32 ohm load)
Balanced: < 1.5 ohm (32 ohm load)
THD+NLO <0.02% (1kHz/10kohm)
General
Power supply12V DC 2A via jack DC
Dimensions147 x 133 x 32.3mm
Weight420g
ColorSilver
Package1x DAC / Headphone amplifier FiiO K11 R2R
1x Power adapter
1x USB-A to USB-C cable
1x 3.5mm to 6.35mm jack adapter
 
Data sheet
InputOptical
InputSPDIF
InputUSB
OutputCoaxial SPDIF
OutputJack 4.4mm
OutputRCA
OutputJack 6.35mm
DAC / ADC ChipR2R LADDER DAC
Max sampling rateDSD256
Max sampling rate384kHz
ColorSilver
ClassN/A
NetworkingNo
Remote ControlNo
 
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FIIO K11 R2R DAC Headphone Amplifier 24bit 384kHz DSD256 Silver
The FiiO K11 R2R, the R2R version of its cousin the K11, is a small, versatile and high-performance DAC headphone amplifier. It is based on a...

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