Key Features
- R2R ladder design for analogue-style sound
- 1300mW balanced output powers demanding headphones with ease
- Supports 32-bit/384kHz PCM and native DSD256 audio decoding
- Features three gain levels and precision volume control
- Balanced and single-ended outputs for flexible setups
FiiO K11 R2R Compact Desktop DAC and Headphone Amplifier, Silver Overview
The FiiO K11 R2R Compact Desktop DAC and Headphone Amplifier features a fully differential 24-bit R2R resistor ladder, delivering a natural, analogue-style sound. It supports 32-bit/384kHz PCM and native DSD256 decoding, offering a warmer character than the standard delta-sigma K11. With up to 1300mW of power from the 4.4mm balanced output, a 6.35mm single-ended port, three gain levels, and switchable OS/NOS modes, it gives you the flexibility to drive anything from sensitive IEMs to high-impedance headphones.
Product Ref: 336511
Full Description
View Full DescriptionFully Differential 24-bit R2R DAC
The K11 R2R features a self-developed four-channel, fully differential DAC with two resistor arrays per channel. That’s forty-eight resistors per channel—one hundred ninety-two in total—each with 0.1% precision and low temperature drift. This architecture reduces noise and distortion, creating a silent background and cleaner output. The result is a smoother and more natural sound, giving you a more analogue-like listening experience.
Dual NOS/OS Operating Modes
You can switch between NOS (non-oversampling) and OS (oversampling) modes depending on your listening preference. NOS mode keeps the signal at its native sample rate, offering a more laid-back, organic sound. OS mode upsamples everything to 384kHz, delivering more detailed and transparent audio. This gives you flexibility to tune the output to match your headphones, source material, or just your personal preference.
High Output and Versatile Connectivity
With 1300mW per channel under 32 ohms via the 4.4mm balanced output, the K11 R2R is powerful enough to drive demanding over-ears, while still offering low-gain modes suitable for sensitive IEMs. You also get both balanced and single-ended headphone outputs (4.4mm and 6.35mm), RCA line-out, optical and coaxial digital inputs, and a USB-C interface. Three gain levels and a low-noise power supply give you distortion-free sound across all outputs.
Features
- Fully differential 24-bit R2R DAC with resistor ladder architecture
- NOS (Non-Oversampling) and OS modes for different sound profiles
- 1300mW output via 4.4mm balanced headphone out
- Three gain levels suit IEMs and high-impedance headphones
- Supports 32-bit/384kHz PCM and native DSD256 decoding
- Low-noise multi-channel power supply with external 12V adapter
- NJW1195A volume control chip for precise, low-distortion adjustment
- Balanced and single-ended outputs for flexible connectivity
- Professionally designed amp circuit with OPA1642 and SGM8262 op-amps
- Built-in DC protection and pop-noise suppression for safe headphone use
- Custom LCD screen with sampling rate and output indicators
- RGB logo light shows sampling rate and is fully customisable
What's in the Box?
- FiiO K11 R2R Headphone Amp/DAC
- Power adapter (incl. AC cable)
- USB A-C cable
- 6.35mm headphone adapter
- Quick start guide
- Warranty card
Specifications
General
| Name/Model | K11 R2R |
|---|---|
| Colours | Black/Silver/Red |
| Dimensions (including feet, W x D x H) | 147 x 133 x 32.3 mm |
| Weight | approx. 420g |
| Gain | L/M/H |
| Adaptive impedance | PO: 8 150ΩBAL: 8 350Ω |
| Oversampling setting | OS/NOS |
| FiiO Control | N/A |
| Max sampling rate | 384kHz-32bit/DSD256 (USB DAC)192kHz-24bit (Coaxial)96kHz-24bit (Optical) |
| Sampling rate indication | LOGO indicator light shows as default:Cyan: 48KHz and belowYellow: above 48kHzGreen: DSD |
| Firmware upgrade | Supports upgrade through USB |
Buttons and Ports
| Volume control | Volume knob |
|---|---|
| Knob | Encoder knob (including volume adjusting and menu confirming) |
| Single-ended line-out | RCA port |
| Digital coaxial in | RCA port |
| Balanced out | Standard 4.4mm port |
| USB | Type-C (data transmission) |
| Digital optical in | Optical port |
| Digital coaxial out | RCA port (only works in USB mode) |
| Headphone out | Standard 6.35mm port |
Power Supply Parameters
| Power supply | DC 12V/2A |
|---|---|
| Battery capacity | No battery |
Audio Parameters
Parts of performance and parameters of Line-out output (RCA, OS mode)
| THD+N & Noise | About 0.025% (1kHz/0dB@10KΩ) |
|---|---|
| Crosstalk | ≥111dB |
| Frequency response | 20Hz 50kHz: damping<1.2dB20Hz 20KHz: damping<0.2dB |
| SNR | ≥115dB (A-weighted) |
| Noise floor | <5.1uV (A-weighted) |
| Dynamic range | ≥107dB |
| Line output level | 2.7Vrms |
Parts of performance and parameters of headphone output (6.35mm, OS mode)
| Output power | L+R≥660mW +660mW(16Ω, THD+N<1%)L+R≥460mW +460mW(32Ω, THD+N<1%)L+R≥50mW+50mW (300Ω, THD+N<1%) |
|---|---|
| Channel crosstalk | ≥72dB |
| Frequency response | 20Hz 50kHz: damping<1.3dB20Hz 20KHz: damping<0.2dB |
| THD+N | About 0.025% (1kHz/0dB@32Ω) |
| SNR | ≥115dB (A-weighted) |
| Noise floor | <7.2uV (A-weighted) |
| Dynamic range | ≥107dB |
| Output impedance | <1Ω |
| Peak output voltage | 11Vp-p |
Parts of performance and parameters of headphone output (4.4mm, OS mode)
| Output power | L+R≥520mW+520mW (16Ω, THD+N<1%)L+R≥1300mW+1300mW (32Ω, THD+N<1%)L+R≥220mW+220mW (300Ω, THD+N<1%) |
|---|---|
| Channel crosstalk | ≥107dB |
| Frequency response | 20Hz 50kHz: damping<1.3dB20Hz 20KHz: damping<0.2dB |
| THD+N | About 0.025% (1kHz/-11.6dB@32Ω) |
| SNR | ≥115dB (A-weighted) |
| Noise floor | <14.1uV (A-weighted) |
| Dynamic range | ≥107dB |
| Output impedance | <1.5Ω |
| Peak output voltage | 23Vp-p |
Product Information
| Product code | FIIOK11-R2R-SILVER |
|---|---|
| EAN | 6953175710738 |
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