FiiO K11 R2R Desktop DAC and Headphone Amplifier

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Fiio K11 R2R Desktop DAC and Headphone Amplifier

$229.99

Finish

Categories: Audio, DACs, Headphone Amps, Receivers & Amplifiers SKU: N/A

FiiO Presents The All-New And Upgraded 24Bit R2R DAC & Amp – The K11 R2R

FiiO introduces an all-new R2R variant of its acclaimed K11 desktop DAC&Amp. Featuring a self-developed 24-bit R2R Resistor Array, the K11 R2R delivers smooth and rich sound. It offers NOS and OS dual operating modes, dual headphone outputs (6.35mm single-ended and 4.4mm balanced), and a powerful 1300mW per channel output with three-level adjustable gain. Experience rich, smooth, organic sound with the FiiO K11 R2R.

Fully-Differential 24-Bit R2R DAC Architecture For Clean Sound

FiiO’s K11 R2R features a newly developed four-channel, fully differential 24-bit R2R resistor array. Each channel has 48 resistors, totalling 192 high-precision ultra-thin film resistors with 0.1% accuracy and low-temperature drift. This advanced audio circuit architecture ensures clean, crisp output with a dark background.

True Hi-Res Audio Signal Decoding And Dual Operating Mode

The FiiO K11 R2R supports high-resolution audio decoding, handling up to 32-bit/384kHz PCM and DSD256 signals. It features switchable NOS (Non-Oversampling) and OS (Oversampling) modes, offering two distinct sound profiles. NOS maintains the original sampling rate for a more musical presentation, while OS upsamples to 384kHz for enhanced detail and clarity.

Powerful Amplification Stage And Precise Volume Adjustment

The FiiO K11 R2R boasts professionally designed amp circuitry with Ti OPA1642 low-pass filters and dual SGM8262 operational amplifiers. It delivers up to 1300mW per channel, easily driving demanding headphones. The device features three-level gain modes and three independent volume curves for compatibility with both sensitive and high-power gear and uses the NJW1195A digital volume chipset for precise, low-distortion volume adjustment.

Seamless Connectivity With A Variety Inputs And Outputs

The FiiO K11 R2R offers versatile input and output options for diverse audio setups. It features coaxial, optical, and USB digital inputs, along with 4.4mm balanced, 6.35mm single-ended headphone output, and RCA analog line-out connections. Designed to fit various audio needs without straining your budget, the K11 R2R pairs virtually with any device. Pair it with IEMs and headphones to enjoy high-resolution music in all its glory.

Expertly Engineered Audio Circuit For Reliable Audio Transmission

The FiiO K11 R2R transmits the audio signal via a USB processor to a digital audio bridge. After FPGA processing, it goes to the R2R DAC for 4-channel output, then through Ti OPA1642 op-amps for filtering and conversion to single-ended signals. The NJW1195A chip ensures precise volume adjustment. The output stage uses SGM8262 op-amps for 4-way phase inversion and amplification, resulting in single-ended and balanced outputs. The audio circuit includes gain controls, a headphone protection circuit, and a pop noise elimination system for high-quality, reliable sound.

Embedding High-Quality Components For Unmatched Performance

The FiiO K11 R2R is expertly engineered with high-quality internals for an exceptional music listening experience. It features Beryl solid capacitors for a stable, clean power supply, and enhanced heat dissipation with thermal silicone gel and aluminium alloy. An exclusive phosphor copper metal shielding provides corrosion resistance and anti-oxidation, ensuring accurate signal processing. The K11 R2R includes DC protection to prevent headphone damage, a smart power-saving mode, and durable metal-pressed RCA connectors for stability and longevity.

Low-Noise Power Supply Design For Distortion-Free Sound

The FiiO K11 R2R features a professionally designed low-noise power supply with 17 low-noise LDO precision voltage regulator ICs and 2 DC-DC converters, providing a multi-channel power supply of －9V, 8V, ±7.5V, ±6V, 5.4V, 3.3V, 1.8V, and 1.2V. Combined with an external custom 12V switching power supply, it ensures power purity and a solid foundation for powerful output, delivering a high-quality music listening experience.

Designed With A Screen, RGB Logo And Multifunction Knob

The FiiO K11 R2R features a robust, high-definition LCD screen that offers clear visuals and durability. It efficiently displays device status like sampling rates, volume, gain, and output mode. The illuminated RGB FiiO logo changes colours based on the active file’s bitrate, and its brightness, colour, and patterns are customisable via the multi-function knob. This knob also handles power, volume, and menu navigation, with a double press to switch between Line-out, Pre-out, and Phone-out modes. The slim aluminium body and silicone anti-slip pad ensure stable and flexible placement.

Features & Specifications

Headphone Output

Standard 6.35mm port
Standard 4.4mm port

Buttons And Ports

Knob : Encoder knob (including volume adjusting and menu confirming)
Single-ended line-out : RCA port
Digital coaxial in : RCA port
USB : Type-C (data transmission)
Digital optical in : Optical port
Digital coaxial out : RCA port (only works in USB mode)

Hardware Solution

SoC: GD32F303RE,
DAC: FIIO-developed R2R DAC,
USB decoding: SA9312L,
AMP: SGM8262-2*2

Adaptive Impedance

PO: 8~150Ω
BAL: 8~350Ω

Max Supported Sampling Rate

384kHz-32bit/DSD256 (USB DAC)
192kHz-24bit (Coaxial)
96kHz-24bit (Optical)

Sampling Rate Indication

LOGO indicator light shows as default: Cyan: 48KHz and below/Yellow: above 48kHz/Green: DSD
Show on display screen

Oversampling setting

OS/NOS

Driver-free mode (switch mode)

Supported

Gain

L/M/H

Firmware upgrade

Supports upgrade through USB

Line-out output (RCA, OS mode)

THD+N & Noise : About 0.025% (1kHz/0dB@10KΩ)
Crosstalk : ≥111dB
Frequency response : 20Hz~50kHz: damping＜1.2dB
20Hz~20KHz: damping＜0.2dB
SNR : ≥115dB (A-weighted)
Noise floor : ＜5.1uV (A-weighted)
Dynamic range : ≥107dB
Line output level : Line output level

Headphone Output (6.35mm, OS mode)

Output Power : L+R≥660mW +660mW(16Ω，THD+N＜1%)
L+R≥460mW +460mW(32Ω，THD+N＜1%)
L+R≥50mW+50mW (300Ω，THD+N＜1%）
Channel crosstalk : ≥72dB
Frequency response : 20Hz~50kHz: damping＜1.3dB
20Hz~20KHz: damping＜0.2dB
THD+N : About 0.025% (1kHz/0dB@32Ω)
SNR : ≥115dB (A-weighted)
Noise floor : ＜7.2uV (A-weighted)
Dynamic range : ≥107dB
Output impedance : ＜1Ω
Peak output voltage : 11Vp-p

Headphone Output (4.4mm, OS mode)

Output Power : L+R≥520mW+520mW (16Ω, THD+N＜1%)
L+R≥1300mW+1300mW (32Ω, THD+N＜1%)
L+R≥220mW+220mW (300Ω, THD+N＜1%）
Channel crosstalk : ≥107dB
Frequency response : 20Hz~50kHz: damping＜1.3dB
20Hz~20KHz: damping＜0.2dB
THD+N : About 0.025% (1kHz/-11.6dB@32Ω)
SNR : ≥115dB (A-weighted)
Noise floor : ＜14.1uV (A-weighted)
Dynamic range : ≥107dB
Output impedance : ＜1.5Ω
Peak output voltage : 23Vp-p

Power Supply

DC 12V/2A

Battery capacity

No battery

Weight

About 420g

Color

Black / Silver

FIIO Control

N/A

Box Contents

1. FiiO K11 R2R
2. Power adapter*1
3. Power cable*1
4. USB data cable*1
5. Headphone adapter*1
6. Quick start guide*1
7. Warranty card*1

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Reviews

Fiio K11 R2R Desktop DAC and Headphone Amplifier

FiiO Presents The All-New And Upgraded 24Bit R2R DAC & Amp – The K11 R2R

Fully-Differential 24-Bit R2R DAC Architecture For Clean Sound

True Hi-Res Audio Signal Decoding And Dual Operating Mode

Powerful Amplification Stage And Precise Volume Adjustment

Seamless Connectivity With A Variety Inputs And Outputs

Expertly Engineered Audio Circuit For Reliable Audio Transmission

Embedding High-Quality Components For Unmatched Performance

Low-Noise Power Supply Design For Distortion-Free Sound

Designed With A Screen, RGB Logo And Multifunction Knob

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