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FIIO K11 R2R DAC Headphone Amplifier Black
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FiiO K11 R2R DAC Headphone Amplifier 24bits 384kHz DSD256 Black
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: high-performance volume control
Featuring an NJW1195A resistor-based volume control chip, the K11 R2R is able to precisely control its output volume while preserving the signal's level of distortion and noise.
FiiO K11 R2R: 3 adjustable gain levels
The FiiO K11 R2R's 6.35mm jack and balanced 4.4mm jack headphone outputs benefit from 3 levels of gain with adapted volume curves, enabling them to drive a large number of headphones available on the market. This makes it possible to use the K11 R2R with IEMs or headphones of either low or high sensitivity and impedance.
FiiO K11 R2R: considerable output power
With a load of 4 ohms, this small headphone amplifier DAC is capable of delivering up to 1300 mW + 1300mW on its balanced output.
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.
Illuminated logo on the top of the FiiO K11
On the top of the K11, the FiiO logo is illuminated by various LEDs whose brightness, color and light pattern animations can be adjusted.
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.
FiiO K11 R2R little extras
High-quality connectors
Efficient heat dissipation
EMI/RFI protection in phosphor copper
FiiO K11 R2R overview
| 1 | 6.35mm unbalanced headphone output |
| 2 | Balanced 4.4mm headphone output |
| 3 | LCD display |
| 4 | Multi-function button |
| 5 | DC 12V 2A power supply |
| 6 | USB-C input |
| 7 | Toslink optical input |
| 8 | Coaxial input/output |
| 9 | RCA stereo line output |
Technical characteristics
| Specifications | ||
|---|---|---|
| Product type | DAC / Headphone amplifier | |
| Signal processing | 24bit R2R | |
| Microcontroller | GD32F303RET6 | |
| Volume control chip | NJW1195A | |
| OPAs | 2x TI OPA1642 2x SGM8262 | |
| Inputs | 1x USB-C input 1x Toslink optical input 1x Coaxial SPDIF input/output | |
| Outputs | 1x Single-ended 6.35mm headphone output 1x Balanced 4.4mm headphone output 1x RCA line output 1x SPDIF coaxial input/output | |
| Supported sample rates | USB: PCM up to 24bit 384kHz and native DSD up to DSD256 Toslink optical / coaxial : PCM up to 24bit 192kHz | |
| Gain control | ||
| Volume control | ||
| Screen | LCD | |
| Output power | 6.35mm headphone output | L+R ≥ 460mW+460mW @ 32 ohm THD+N=1% (High gain) L+R ≥ 50mW+50mW @ 300 ohm THD+N=1% (High gain) |
| Balanced 4.4mm headphone output | L+R ≥ 1300mW+1300mW @ 32 ohm THD+N=1% (High gain) L+R ≥ 220mW+220mW @ 300 ohm THD+N=1% (High gain) | |
| Frequency response | 20Hz-50kHz | |
| SNR | ≥ 115dB (A-weighted) | |
| Noise level | Single-ended: < 7.2uV (A-weighted) Balanced: < 14.1uV (A-weighted) | |
| Output impedance | Single-ended: < 1 ohm (32 ohm load) Balanced: < 1.5 ohm (32 ohm load) | |
| THD+N | LO <0.02% (1kHz/10kohm) | |
| General | |
|---|---|
| Power supply | 12V DC 2A via jack DC |
| Dimensions | 147 x 133 x 32.3mm |
| Weight | 420g |
| Color | Black |
| Package | 1x DAC / Headphone amplifier FiiO K11 R2R 1x Power adapter 1x USB-A to USB-C cable 1x 3.5mm to 6.35mm jack adapter |
| Input | SPDIF |
| Input | USB |
| Input | Optical |
| Output | Coaxial SPDIF |
| Output | Jack 4.4mm |
| Output | RCA |
| Output | Jack 6.35mm |
| DAC / ADC Chip | R2R LADDER DAC |
| Max sampling rate | 384kHz |
| Max sampling rate | DSD256 |
| Color | Black |
| Class | N/A |
| Networking | No |
| Remote Control | No |
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