FiiO - K11 R2R Red

Artnr: IDS0128395
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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.

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+N1%) / L+R≥50mW+50mW (300Ω, THD+N1%)
Output 4, 4mm balanced L+R≥1300mW+1300mW (32Ω, THD+N1%) / L+R≥220mW+220mW (300Ω, THD+N1%)
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 box
1x 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.