FIIO K11 R2R HEADPHONE AMP AND R2R DAC IS A FIRST FROM FIIO

The FiiO K11 R2R is FiiO’s first Desktop Headphone Amplifier with a Four-channel Fully Differential 24bit R2R DAC, and it costs under £150.

The FiiO K11 R2R Desktop DAC/Amplifier is a versatile low profile Desktop Headphone DAC and Amplifier. With multiple inputs, including USB-Type C, Optical and Coaxial, as well as 6.35mm/4.4mm headphone outputs and RCA stereo line-out.

The FiiOK11 R2R also features a 1.1-inch VA display which can display information about the audio file being listened to.

FIIO K11 R2R HEADPHONE AMP AND R2R DAC

Building upon the original K11, the new K11 R2R is the first FiiO DAC/Amplifier to feature a four-channel fully differential 24bit R2R (Resistor-to-Resistor) DAC. Offering full support for 32-bit/384kHz and native DSD256 Hi-Res audio files, FiiO has engineered the compact K11 R2R to deliver a power output of up to 1300mW.

MULTI FUNCTION KNOB

The FiiO K11 R2R’s multi-function volume knob allows total control of the unit. Power the device on and off; access the menu; adjust volume, and more. Users can also quickly switch between Line Out (LO), Pre-out, and Power Out (PO) modes by simply double-pressing the knob.

FIIO SR11 STREAMER

The FiiO K11 R2R has been designed as an ideal companion to the SR11 streamer which has an identical form factor, creating a compact headphone listening system.

24 BIT R2R DAC

The K11 R2R features FiiO’s four-channel fully differential 24bit R2R DAC. Developed in-house, this DAC consists of 2 x 48 precision thin-film resistor arrays per channel, totalling 192 resistors with 0.1% tolerance and low-temperature drift (30ppm).

The fully differential architecture offered by the K11 R2R is designed to deliver lower noise than typical architecture, as well as less FFT (Fast Fourier Transform) harmonics.

Complementing the DAC within the K11 R2R is a 4-channel electronic volume controller. This resistor ladder electronic potentiometer delivers both low distortion and low noise, allowing for a highly precise volume adjustment.

3 GAIN LEVELS & INDEPENDENT VOLUME CURVES

With three independent gain-levels and volume-curves (High, Medium, Low), FiiO’s engineers have carefully designed the K11 R2R to give a better listening experience with various types of headphones – whether sensitive earphones or harder to drive over-ear headphones.

FIIO K11 R2R HEADPHONE AMP AND R2R DAC ALL-NEW AUDIO CIRCUITRY

Within the K11 R2R, the audio signal is transmitted via a USB interface processor to a digital audio bridge. After being processed by an Field Programmable Gate Array (FPGA), it is sent to the R2R DAC for 4-channel output after decoding. It then passes through two OPA1642 op-amps for low-pass filtering and single-ended analog signal converting, before transmitting to the NJW1195A electronic volume control chip for precise volume adjustment.

The output stage of the K11 R2R uses two SGM8262 op-amps for 4-way phase inversion and amplification, resulting in both single-ended and balanced output signals

DUAL NOS/OS MODES

The FiiO K11 R2R gives users the option of choosing playback via either NOS (Non-Oversampling) or OS (Over-sampling) Modes. NOS Mode has been designed to maintain the original sampling rate for decoding, whilst the OS Mode upsamples audio to a high sampling-rate of 384kHz.

ADJUSTABLE RGB LOGO LIGHTING

The FiiO logo on top of the K11 R2R is illuminated with RGB lighting, giving a quick way to identify the sampling rate of the current audio being played back. ​ Brightness, colour, light patterns, and on/off options are all adjustable within the menu.

FIIO K11 R2R HEADPHONE AMP AND R2R DAC SPECS

DAC: Fully Differential True 24-bit R2R Resistor Arrays

Main Control Chip: GD32F303RET6

Output (6.35mm Single-ended); L+R≥460mW+460mW (32Ω, THD+N＜1%) L+R≥50mW+50mW (300Ω, THD+N＜1%)

Output (4.4mm Balanced): L+R≥1300mW+1300mW (32Ω, THD+N＜1%) L+R≥220mW+220mW (300Ω, THD+N＜1%)

Inputs: 1 x USB Type-C 1 x Coaxial 1 x Optical

Outputs: 1 x 6.35 mm (Single-ended) 1 x 4.4 mm (Balanced) 1 x L/R RCA 1 x Coaxial

USB Input Decoding: PCM: 384kHz/32bit DSD: 256

Coaxial Input Decoding: PCM: 192kHz/24bit

Optical Input Decoding: PCM: 96kHz/24bit

Line-out (LO) Mode

Power Out (PO) Mode

Display: 1.1-inch LCD VA Segment Display

Adjustable RGB Lighting

Dimensions: 147 x 133 x 32.3 mm

Weight: 420g

FIIO K11 R2R HEADPHONE AMP AND R2R DAC PRICE AND AVAILABILITY

FiiO K11 R2R is available in either Obsidian Black or Midnight Silver from late July, priced £149 / $169.

A red version of the K11 R2R will launch later this year.

HiFi PiG Says: The FiiO KR11 R2R makes a very affordable and great looking compact desktop system when paired with the SR11 Streamer.