A new desktop headphone amplifier with advanced, R2R DAC technology developed by FiiO High-performance desktop DAC/AMP R2R Fully differential 24-bit R2R resistor array NOS/OS Dual-Mode Free Switching Professionally designed electronic volume control chipset(NJW1195A) Supports 32-bit/384kHz PCM and native DSD256 audio signal processing Professional audio amplifier circuit 1300mW+1300mW strong power Three-stage adjustable gain Specially designed low-noise power supply 6, 35mm+4.4mm dual headphone output High quality Emerald solid-state capacitors LCD display RGB logo illumination 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. SpecificationsDAC: 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 What`s in the box1x FiiO K11 R2R 1x power supply 1x USB data cable 1x quick start guide 1x 6.3 to 3.5mm jack adapter Differences - Fiio K11 vs. K11 R2R The most obvious difference between the R2R and the K11 lies in the chip used. It was originally built with a CS43198 ΔΣ chip. Delta Sigma chips are found in many lower-end DAC/AMPs as they offer high bit depth and high performance in terms of manufacturing costs. The price for this is that THD+N and noise are higher than with an R2R chip. For this reason, R2R chips are more difficult to manufacture and often much more expensive. Developing an R2R chip for a low-cost item is not an easy endeavour. Furthermore, the development of a high-resolution R2R chip that supports 384 kHz/24-bit is a new development that is not yet found in entry-level devices. To see R2R in a DAC/amplifier for under $200 is a miracle in itself. What is the difference between R2R and ΔΣ chips, theoretically you can achieve a warmer sound with most R2R DACs without sacrificing the transparency of the higher frequencies. Although the THD+N and noise floor of the K11 and K11 R2R are very similar, you still get less harmonic distortion, resulting in a more natural reproduction of the high frequencies.This means that the R2R has a warmer yet more transparent sound. Other changes include the NJW1195A volume control utilising a resistor ladder potentiometer, meaning a more controlled and consistent volume control. The output power of both units has not changed and you can still drive any headphones you could before. The inputs and outputs have also remained the same. And there is now an OS/NOS mode that allows you to faithfully recreate the waveforms. Summary Rather than just offering listeners a product with a new look, FiiO has decided to drastically improve the quality and internals of its entry-level DAC/AMP. Some companies remake products by sticking a label on them and investing in marketing to offer inferior products at the same price. This is not the case with FiiO, who have made some great technical improvements with the K11 R2R.

FiiO K11 DAC/Amp for the desktop     Fully balanced design of DAC and amplifier     Powerful output with 1.4 W     3-stage adjustable gain     High-quality CS43198 DAC chipset     Supports up to 384kHz/32Bit PCM and native DSD256 signals     Specially developed low-noise power supply unit     Adjustable RGB logo illumination     Multi-function knob     Driver-free USB DAC mode     Multiple input/output options     Compact and ergonomic design     Compatible with gaming consoles (PS5, Nintendo Switch, etc) The FiiO K11 is a brand new USB DAC/AMP with a fully balanced design. It is equipped with the powerful 32-bit CS43198 DAC, which provides exceptional high-resolution PCM and DSD signal decoding. It is equipped with a range of input and output options, including USB, coaxial and optical inputs, as well as 4.4mm, 6.35mm and RCA output options. The FiiO K11 is a desktop DAC/AMP that can be easily used with a wide range of devices including PCs, laptops, smartphones and even gaming consoles such as PS5 and Nintendo Switch. Ultimate performance with premium audio circuitryOver the years, FiiO has developed and launched several successful USB DAC/AMP models. The latest model, the FiiO K11, features specially designed audio circuitry that promises premium audio performance. The K11 is equipped with a powerful CS43198 DAC chipset that offers ultimate performance in decoding high-resolution 32-bit/384kHz PCM and Native DSD256 audio signals.Multiple input/output optionsThe FiiO K11 offers multiple input and output options. Digital inputs via coaxial, optical and USB input modes and the following analogue outputs: balanced 4.4mm, unbalanced 6.35mm and analogue RCA outputs. With the K11, you can easily meet your needs for a powerful audio setup at an affordable price. Simple USB input with worry-free driver-free operationThe FiiO K11 USB DAC/AMP supports hassle-free USB connection to a wide range of devices. It can be operated without any driver installation. The K11 supports a wide range of devices including PCs, laptops, smartphones, tablets and even gaming consoles (PS5, Nintendo Switch, etc.). High-performance amplifier section with three-stage gainThe FiiO K11 is a high performance USB DAC/AMP. The unit is equipped with a powerful headphone amplifier section with three gain stages, delivering a powerful output power of up to 1400mW at 32Ω impedance load via the balanced connector output. It can drive most headphones and in-ear monitors with ease.Specially designed low-noise power supplyThe FiiO K11 is equipped with a specially designed low-noise power supply. Using more than 16 low-noise LDOs for precise voltage stabilisation and an external 12 V power supply, the K11 achieves robust performance with stable power to all areas of the audio circuit.Perfectly clear screenThe FiiO K11 is equipped with a high-contrast, durable VA display. It displays the active sample rate, volume level, gain level and activated output mode.Adjustable RGB logoThe FiiO logo on the top of the K11 DAC/AMP has an RGB illuminated design. It lights up in different colours depending on the active file bit rate. Brightness, colour and light pattern can be adjusted using the multi-function knob.Multi-function button controlThe FiiO K11 has a minimalist design with a multi-function button. This button can serve as a power button, volume control, menu exploration, screen control, etc. Users can also switch between line-out and phone-out mode by simply double pressing the button.