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FIIO K13 R2R
Reference Headphone DAC/Amp.
24-bit differential R2R DAC with 192 resistors
NOS/OS modes for natural or detailed sound
2400 mW per channel (balanced, 32 Ω)
Parametric EQ, Bluetooth 5.4 (LDAC) and multiple outputs (RCA, XLR, 6.35, 4.4 mm)
High purity dual supply and aluminum chassis with LCD display
Warm, powerful and precise sound
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FiiO K13 R2R: Reference Desktop DAC & Headphone Amplifier with Discrete R2R Technology
The FiiO K13 R2R is a high-fidelity desktop DAC and headphone amplifier designed for audiophiles seeking precise, powerful, and natural sound reproduction. At its core lies a fully differential 24-bit R2R DAC architecture, composed of 48 precision thin-film resistors per channel—a total of 192 resistors—delivering an organic, distortion-free musical texture with remarkable tonal realism.
With 0.1% tolerance resistors and a completely balanced topology, the K13 R2R offers rich musicality, a stable stereo image, and outstanding transparency that bridges the warmth of analog with the precision of digital.
24-bit Differential R2R DAC
The K13 R2R features a four-channel discrete ladder DAC operating in a fully balanced configuration. This minimizes noise and harmonic distortion (FFT artifacts), producing a blacker background and finer microdetail.
The result: a sound signature that is warm yet analytical, with exquisite tonal balance and lifelike realism.
NOS & OS Modes: Tailor Your Listening Experience
NOS (Non-OverSampling) mode preserves the original sampling rate for a natural, analog-like presentation.
OS (OverSampling) mode upsamples the signal to 384 kHz, enhancing clarity, high-frequency extension, and spatial precision.
This flexibility lets users fine-tune the playback character to their headphones, preferences, or music style.
Power & Output Versatility
With up to 2400 mW per channel (balanced, 32 Ω), the K13 R2R easily drives everything from sensitive IEMs to high-impedance headphones.
It offers a full range of outputs — RCA, XLR, 6.35 mm, 4.4 mm, and 4-pin XLR — allowing use as a headphone amp, standalone DAC, or preamp in a high-end desktop setup.
10-Band Parametric EQ (PEQ)
Through the FiiO Control app or web interface, users can access a professional 10-band PEQ powered by the XMOS XU316 and ESP32-S3 controllers.
It supports real-time EQ adjustments with minimal latency, offering presets like Retro PEQ or fully customizable curves for detailed sound shaping.
Fully Balanced Circuit Design
Every stage—from DAC and low-pass filtering to volume control and amplification—is symmetrical and fully differential, ensuring ultra-low interference, minimal noise, and a wide, stable soundstage.
Built-in gain protection, anti-pop circuitry, and thermal safeguards provide reliable operation with all headphone types.
High-Purity Dual Power Supply
The K13 R2R uses a shielded 30 W nickel-alloy switching supply, supplemented by an optional 12 V DC input for external linear power supplies.
Its multi-rail regulated design, with 18 low-noise LDOs and 5 DC-DC converters, delivers exceptionally clean, stable power.
Premium tantalum and ELNA RA3 capacitors contribute to a natural, smooth, and dynamic sound signature.
Design & User Experience
Crafted from CNC-milled aluminum, the K13 R2R features a transparent top window showcasing the resistor ladder array.
A high-definition LCD display provides real-time info such as sampling rate, gain, and volume.
Additional features include:
Bluetooth 5.4 with LDAC, AAC, and SBC
RGB lighting effects
Independent volume controls
Remote control support
Auto-power management
Technical Specifications
DAC Architecture: 24-bit Differential R2R (48 resistors/channel)
USB Interface: XMOS XU316
MCU: ESP32-S3
Inputs: Dual USB-C, Coaxial, Optical
Outputs: RCA, XLR, 6.35 mm, 4.4 mm balanced, 4-pin XLR
Decoding: PCM 384 kHz / 32-bit, DSD256
Bluetooth 5.4: LDAC, AAC, SBC
Output Power (Balanced): 2400 mW ×2 @ 32 Ω / 600 mW ×2 @ 300 Ω
SNR: ≥116 dB (A-weighted)
THD+N: 0.0173% (1 kHz, 32 Ω)
Frequency Response: 20 Hz – 80 kHz (<2.9 dB)
Output Impedance: <1 Ω (balanced) / <0.7 Ω (SE)
Power Input: AC 100–240 V (50/60 Hz) or DC 12 V / 2.5 A
Dimensions: 210 × 188 × 42 mm
Weight: 980 g
The FiiO K13 R2R merges analog precision with advanced digital engineering, delivering the power, refinement, and transparency required to drive any headphone with authority and musicality.
A true reference-grade DAC/amp for discerning listeners seeking the purest expression of sound.
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