FiiO K11 R2R DAC / Headphone Amplifier

Here we have a small, neat Digital to Analogue Converter / Headphone Amplifier from FiiO. Ideal for a desktop system this unit is in very good condition noting a very small blemish on the screen – please refer to photographs. It is supplied in original packaging along with power supply unit, cable, USB cable, manual, and our normal three month warranty.
FiiO Say….
The FiiO K11 R2R Desktop DAC & Headphone Amplifier is engineered to deliver exceptional audio performance, incorporating cutting-edge technology to enhance your listening experience. At its core, the K11 features a fully differential true 24-bit R2R DAC architecture.
This innovative design utilizes precision thin-film resistor arrays, totalling 192 resistors per channel, ensuring unparalleled sound accuracy. The result is a remarkably clean signal with reduced noise and distortion, allowing listeners to enjoy their music with a depth and clarity that standard DACs cannot achieve.
The K11 R2R stands out as a sophisticated solution for audiophiles seeking an immersive audio experience in a compact form.
One of the standout features of the K11 R2R is its dual operating modes: NOS (Non-Oversampling) and OS (Oversampling). In NOS mode, the amplifier maintains the original sampling rate, preserving the integrity of the audio signal and providing a natural listening experience.
Conversely, OS mode upsamples audio to a high sampling rate of 384kHz, enhancing clarity and detail for those who prefer a more refined sound. This versatility allows users to select the mode that best suits their audio preferences, making the K11 R2R adaptable to various listening scenarios, whether for casual enjoyment or critical listening sessions.
The K11 R2R boasts a meticulously crafted audio circuit designed for optimal performance. Audio signals are processed through a sophisticated digital audio bridge and an FPGA, ensuring precise decoding before reaching the R2R DAC. After decoding, the signals are filtered and converted to analog through high-quality op-amps, delivering both single-ended and balanced outputs.
This advanced design minimizes interference and maximizes sound quality, resulting in a richer, more dynamic audio experience. Additionally, the inclusion of a headphone protection circuit and a pop noise elimination system guarantees reliable operation, allowing you to focus solely on your music.
To support its advanced features, the K11 R2R is equipped with a specially-designed power supply that employs multiple low-noise LDO precision regulators and DC-DC converters. This comprehensive power management system ensures that the amplifier receives a clean and stable power supply, essential for high-quality audio output.
With an impressive output capability of 1300mW+1300mW under balanced modes, the K11 R2R can effortlessly drive a wide range of HiFi headphones and earphones, allowing you to fully experience the nuances of your favorite tracks without compromising on performance.
The FiiO K11 R2R is designed with user convenience in mind, featuring a high-contrast LCD screen that displays vital information such as sampling rate, volume, and gain settings at a glance. The amplifier’s multi-function volume knob allows for easy control of power, volume, and menu navigation, enhancing the overall user experience.
Additionally, the adjustable RGB logo lighting provides a stylish touch, allowing you to personalize the device’s appearance while also indicating the current sampling rate. This thoughtful design not only looks great on any desktop but also enhances usability for both novice and experienced users.
Safety and reliability are paramount in the K11 R2R’s design, featuring robust protection systems such as DC protection to prevent headphone damage from abnormal output currents. The amplifier also incorporates smart power-saving features, automatically entering low-power mode when idle to conserve energy and prevent overheating.
Each K11 R2R comes with a complete package that includes a power adapter, USB data cable, headphone adapter, and a quick start guide, ensuring you have everything needed for a seamless setup. This commitment to quality and safety, combined with the amplifier’s impressive performance, makes the FiiO K11 R2R an outstanding choice for anyone serious about audio.
Specifications:
DAC: FIIO-developed R2R DAC, USB decoding: SA9312L
Max Supported Sampling Rate 384 kHz – 32-bit/DSD256 (USB DAC); 192 kHz – 24-bit (Coaxial); 96 kHz – 24-bit (Optical)
Line Output:
THD+N & Noise: 0.025% (1 kHz/0 dB @ 10 kΩ)
SNR: ≥115 dB (A-weighted)
Crosstalk: 111 dB
Noise Floor: < 5.1 µV (A-weighted)
Frequency Response: 20 Hz ~ 50 kHz: damping < 1.2 dB; 20 Hz ~ 20 kHz: damping < 0.2 dB
Dynamic Range: ≥ 107 dB
Line Output Level: 2.7 Vrms
Headphone Output (6.35 mm):
Output Power: ≥ 660 mW (16Ω); 460 mW (32 Ω); 50 mW (300 Ω)
THD+N: 0.025% (1 kHz/0 dB @ 32 Ω)
SNR: ≥115 dB (A-weighted)
Noise Floor: < 7.2 µV (A-weighted)
Channel Crosstalk: ≥ 72 dB
Dynamic Range: ≥ 107 dB
Frequency Response: 20 Hz ~ 50 kHz: damping < 1.3 dB; 20 Hz ~ 20 kHz: damping < 0.2 dB
Output Impedance: < 1 Ω
Peak Output Voltage: 11 Vpp
Headphone Output (4.4mm):
Output Power: 520 mW (16Ω); 1300 mW (32Ω); 220 mW (300Ω)
THD+N: 0.025% (1 kHz/- 11.6 dB @ 32 Ω)
SNR: ≥ 115 dB (A-weighted)
Noise Floor: < 14.1 µV (A-weighted)
Channel Crosstalk: ≥ 107 dB
Dynamic Range: ≥ 107 dB
Frequency Response: 20 Hz ~ 50 kHz: damping < 1.3 dB; 20 Hz ~ 20 kHz: damping < 0.2 dB
Output Impedance: < 1.5 Ω
Peak Output Voltage: 23 Vpp
Power Supply: DC 12 V/2 A
Dimensions: 147 (W) x 133 (D) x 32.3 (H) mm
Weight: 420 g