The FiiO K11 R2R, the R2R version of its cousin the K11, is a small, versatile and high-performance DAC / headphone amplifier. It is based on a resistor network and audiophile components such as a GD32F303RET6 microcontroller, two TI OPA1642 OPAs, two SGM8262 amplifier chips and an R2R NJW1195A volume controller. The FiiO K11 R2R is therefore able to support sampling rates up to PCM 24bit 384kHz and native DSD up to DSD256, while delivering up to 2x1300mW into 32 ohm on its balanced headphone output. Added to this are 3 levels of gain, enabling it to drive the majority of headphones on the market. Moreover, the DAC features NOS and OS modes for a final sound restitution adapted to all types of source and to the preference of each user. On the interface side, the K11 R2R benefits from a USB input, a Toslink optical input, a coaxial input/output, an RCA line output and, of course, two headphone outputs: single-ended 6.35mm jack and balanced 4.4mm jack. An eye-catching LCD display and illuminated logo complete the package for a pleasant aesthetic.
FiiO K11 R2R: balanced 24bit R2R DAC
The K11 R2R features two networks of 48 resistors per channel, for a total of 192 resistors, offering precise, detailed conversion of the sound signal. Its balanced architecture reduces noise and unwanted harmonics. As a high-performance DAC, it supports sampling rates up to PCM 24bit 384kHz and native DSD256 via its USB input.
FiiO K11 R2R: R2R DAC in OS and NOS modes
NOS (Non-Oversampling) mode preserves the sampling rate of the incoming signal for authentic rendering, while OS (Oversampling) mode oversamples the incoming signal to 384kHz for superior audio performance and clear sound.
FiiO K11 R2R: an audiophile circuit
The audio signal passes through audiophile components within the K11 R2R. First, there's a USB processor, followed by an audio bridge and an FGPA leading to R2R resistor networks for digital/analog signal conversion. Next comes the amplification stage, comprising OPA1642 TI AOPs, a low-pass filter, NJW1195A volume controller and gain control, before finishing on the output stage with two SGM8262 amplifier chips. A protection circuit and anti-pop system also protect your headphones or in-ear monitors.
FiiO K11 R2R: a refined appearance
The front panel of the K11 R2R features an attractive LCD display showing information about the resolution of the file being played, the volume and gain levels, and the input source.
FiiO K11 R2R: a low-noise power stage
The power supply stage of the FiiO K11 R2R uses no less than 17 low-noise LDO regulators and 2 DC-DC converters to supply the device's analog and digital circuits separately. The K11 R2R therefore benefits from a clean, stable power supply for its various circuits.
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