FIIO K11 R2R Silver DAC & Headphone Amplifier

The new FiiO K11 R2R offers advanced FiiO proprietary R2R DAC technology and versatile connectivity for desktop audio enthusiasts. 

Fully differential 24-bit R2R DAC array 

FiiO has equipped the K11 R2R with its newly developed fully differential 24-bit R2R resistor array with four channels. 

It consists of 48 resistors per channel, totalling 192 high-precision, ultra-thin film resistors with an accuracy of 0.1% and low temperature drift between the four channels. 

Thanks to the specially designed audio circuit architecture, it promises a clean and sharp output with a dark background. 

NOS/OS dual operating modes 

The FiiO K11 R2R has two operating modes, NOS (non-oversampling) and OS (oversampling). 

These are freely switchable and offer dual sound characteristics with the device. 

In NOS mode, the original sampling rate is retained during signal processing, while in OS mode all signals are oversampled to 384kHz for processing. 

NOS mode results in a more musical presentation, while OS mode delivers more detail and clarity. 

Powerful amplifier section 

FiiO has equipped the K11 R2R with a professionally developed amplifier circuit. 

It consists of Ti OPA1642 as a low-pass filter and two SGM8262 operational amplifiers in professional quality. 

The K11 R2R has an output power of up to 1300mWx2, which is enough to drive even the most demanding headphones with ease. 

It features three-stage amplification modes that allow easy pairing with sensitive and power-hungry devices. 

The K11 R2R also utilises the precise NJW1195A digital volume chipset for accurate volume control with low distortion between channels.

Two headphone outputs

The FiiO K11 R2R has two headphone outputs. It consists of an unbalanced 6.35 mm connection and a balanced 4.4 mm output. 

You can easily pair different IEMs and headphones with the K11 R2R and enjoy high-resolution music in all its splendour. 

True high-resolution audio signal processing

The FiiO K11 R2R supports the decoding of high-resolution audio signals. 

It offers full support for PCM and DSD signal processing with up to 32-bit/384 kHz PCM and DSD256 audio signals. 

For DSD256, the DSD output mode must be set to native. 

It is converted internally to PCM for R2R signal processing. 

Professionally developed low-noise power supply

The FiiO K11 R2R has a professionally developed low-noise power supply. 

It consists of 17 low-noise LDO precision voltage regulator ICs and 2 DC-DCs that provide a multi-channel power supply. 

The external 12 V power supply ensures a clean output with low noise and low distortion. The K11 R2R delivers high quality sound to its users. 

Specifications

• 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: USB Type-C, Coaxial, 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/32-bit / DSD 256 
• Coaxial input decoding: PCM: 192kHz/24-bit 
• Optical input decoding: PCM 96kHz/24-bit 
• Line-Out (LO) mode Power-Out (PO) mode 
• Display: 1.1-inch LCD VA segment display 
• Adjustable RGB illumination 
• Dimensions: 147 x 133 x 32.3 mm 
• Weight: 420 g