FiiO K11 R2R Desktop DAC and Headphone Amplifier - True 24-Bit R2R Resistor Array Technology The FiiO K11 R2R is a premium desktop DAC and headphone amplifier built around FiiO's own self-developed fully differential true 24-bit R2R DAC resistor array architecture - a technology that sets it apart from conventional delta-sigma designs and brings a uniquely organic, musical character to every listening session. Designed for home audio enthusiasts and desktop hi-fi setups, the K11 R2R delivers exceptional performance across both single-ended and balanced outputs, with the versatility to connect to virtually any audio source or headphone. At the heart of the FiiO K11 R2R is a four-channel fully differential R2R DAC comprising 2x48 precision thin-film resistor arrays per channel - a total of 192 resistors with 0.1% tolerance and low temperature drift of 30ppm. This configuration produces lower noise, fewer FFT harmonics, and a darker, blacker music background compared to typical architectures, resulting in the smooth, natural, and tonally rich sound that R2R DAC technology is celebrated for among audiophiles. The K11 R2R supports both NOS (Non-Oversampling) and OS (Oversampling) modes, giving users full control over their listening experience. In NOS mode, the original sampling rate is preserved for an authentic, organic presentation. In OS mode, the signal is upsampled to 384kHz for a more refined, detailed sound. Both modes are easily toggled, and the device supports PCM 384kHz/24-bit and DSD256 decoding via USB, ensuring compatibility with the most demanding high-resolution audio formats. Volume control is handled by the NJW1195A, a high-quality 4-channel electronic potentiometer with a resistor ladder design that delivers low distortion and low noise precise volume adjustment. Combined with 3 independent gain levels and 3 independent volume curves, the FiiO K11 R2R adapts effortlessly to any headphone - from sensitive in-ear monitors to demanding full-sized over-ear headphones. Output power is equally impressive. Via the 4.4mm balanced headphone output, the K11 R2R delivers up to 1300mW 1300mW into 32Ω, while the 6.35mm single-ended output provides up to 660mW 660mW into 16Ω. Both outputs maintain an SNR of ≥115dB and THD N of approximately 0.025%, ensuring clean, distortion-free amplification at any volume level. The power supply design is equally meticulous: 17 low-noise LDO precision regulators and 2 DC-DC converters provide multi-channel isolated power rails, all fed by an external custom 12V switching power supply. High-quality Beryl solid capacitors with ultra-low ESR further enhance power stability and signal purity. Connectivity is comprehensive - USB Type-C input, RCA line output, optical and coaxial digital inputs, coaxial digital output, plus both 6.35mm single-ended and 4.4mm balanced headphone outputs. A custom high-contrast LCD screen displays sampling rate, volume, gain, and output mode at a glance, while the RGB logo lighting provides instant visual confirmation of the current sampling rate. The multi-function volume knob controls all device functions with intuitive single-press, double-press, and rotary actions. Available in Black, Silver, and Red, the FiiO K11 R2R is a complete, high-performance desktop audio solution that brings the warmth and musicality of true R2R decoding to any listening space.
