Description
FiiO K11 R2R Desktop DAC and Headphone Amplifier
Organic. Musical. Accessible. The FiiO K11 R2R breaks the barrier to high-end audio. By abandoning traditional DAC chips in favor of a discrete 24-bit R2R resistor array, this desktop unit delivers the uniquely warm, smooth, and natural sound signature that audiophiles crave—at a fraction of the usual cost. It is the perfect entry point into the world of "Analog Digital" audio.
The Magic of R2R Architecture
Fully Differential 24-Bit R2R Array
Unlike standard DACs that use delta-sigma modulation, the K11 R2R employs FiiO's self-developed four-channel fully differential 24-bit resistor array. This consists of 48 precision resistors per channel (192 total) with 0.1% accuracy and low temperature drift. The result is a sound that feels more "real" and less "processed," with rich vocals and dense mids.
NOS & OS Dual Modes
Customize your sound with a simple toggle:
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NOS (Non-Oversampling) Mode: Preserves the original sampling rate for a raw, phase-perfect, and highly musical presentation. Preferred by purists for its organic timbre.
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OS (Oversampling) Mode: Upsamples audio to 384kHz for superior anti-aliasing and a smoother, more refined technical performance.
Powerful and Precise
1300mW Balanced Output
Despite its slim profile, the K11 R2R packs a punch. It delivers up to 1300mW per channel (at 32Ω) via the 4.4mm balanced output. This provides ample headroom to drive high-impedance headphones like the Sennheiser HD600 or planar magnetic models with authority and deep bass control.
NJW1195A Electronic Volume Control
To solve the common "scratchy pot" and channel imbalance issues of entry-level amps, the K11 R2R uses the audiophile-grade NJW1195A volume control chip. This ensures precise, low-noise volume adjustment and perfect left/right balance, even when listening at very low levels with sensitive IEMs.
Technical Specifications
| Feature |
Detailed Specification |
| DAC Architecture |
4-Channel Fully Differential 24-bit R2R Resistor Array |
| Max Output Power |
≥1300mW + 1300mW (32Ω, Balanced) |
| Sampling Support |
PCM 384kHz/24bit, DSD256 |
| Operating Modes |
NOS (Non-Oversampling) / OS (Oversampling) |
| Inputs |
USB Type-C, Optical, Coaxial |
| Outputs |
6.35mm SE, 4.4mm Balanced, RCA Line-Out |
| Display |
VA LCD Screen (Integrated into Logo) |
| Dimensions |
147 x 133 x 32.3 mm (Slim Profile) |
| Weight |
Approx. 420g |
Why Choose the K11 R2R?
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Distinctive Design: Features a minimalistic "Slim" chassis with a clever VA display hidden under the tempered glass top logo, showing sampling rates and volume.
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Three Gain Levels: High, Medium, and Low gain settings allow for perfect matching with both sensitive in-ear monitors and power-hungry over-ear headphones.
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RGB Ambient Light: The FiiO logo illuminates with customizable RGB colors, indicating the audio format (e.g., Cyan for PCM, Green for DSD).
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True Line-Out: Can be set to "LO" mode to bypass the volume control, acting as a pure R2R DAC for your active speakers or external amplifier.
Frequently Asked Questions
What is the difference between K11 (Standard) and K11 R2R?
The Standard K11 uses a CS43198 chip for a clean, modern, and detailed sound. The K11 R2R uses a resistor array for a warmer, smoother, and more "analog" sound. If you prefer vocals and jazz, choose the R2R. If you prefer pop and fast electronic music, the Standard K11 might be better.
Does it heat up?
R2R circuits involve many resistors handling current, so the unit will run slightly warmer than chip-based DACs. This is normal and within safe operating limits.
Can I use it with PS5?
Yes. The K11 R2R supports UAC 1.0 mode, making it fully compatible with PS5 and Switch for an immersive gaming audio experience.
