FiiO K13 R2R – Fully Balanced Desktop R2R DAC & Headphone Amplifier

FiiO K13 R2R delivers high-fidelity digital audio with its discrete resistor ladder DAC, powerful headphone output, and versatile connectivity. Ideal for audiophiles, headphone lovers, and digital music setups who want rich detail, warmth and flexibility.

Key Features

• True 24-bit fully differential R2R ladder DAC: Uses FiiO’s four-channel resistor array with 48 precision thin-film resistors per channel (192 total), 0.1 % accuracy, low drift for organic, musical sound
• Dual NOS / Oversampling modes: Choose NOS for unaltered, natural sound, or Oversampling to refine clarity and detail
• High-power headphone outputs: Both balanced and single-ended outputs; balanced drives up to ≈2400 mW + 2400 mW into 32 Ω, with gain settings to handle 600-Ω headphones
• Wide connectivity: USB-C, optical, coaxial, I²S digital inputs; balanced XLR, 4.4 mm balanced and 6.35 mm single-ended headphone outs; balanced and single-ended line-outs
• Premium power architecture: Dual-rail power supplies (AC + external DC input), 30 W internal switching supply with shielded cover, many low-noise LDOs and DC-DC converters, premium capacitors for stable clean power
• Digital filters, PEQ & control: 10-band parametric EQ via FiiO Control app; multiple digital filters; OLED or LCD display for sample rate, input, filter settings; gain levels for matching headphones

Customer Benefits

With the K13 R2R you gain a DAC/amp that not only reproduces music with warmth and nuance but also gives you enough power to drive demanding headphones without strain. The flexible inputs and outputs let you plug in your favourite sources and headphones seamlessly. Whether you want a relaxed listening session or detailed analytic playback, its control options (filters, PEQ, gain) allow you to dial in your preferred tone.

Quick Specs

• DAC type: Fully differential 24-bit R2R resistor ladder (192 thin-film resistors total)
• Supported formats: PCM up to 384 kHz/32-bit; DSD up to DSD256
• Headphone outputs: Balanced (4.4 mm & XLR), single-ended 6.35 mm
• Balanced power output: ≈2400 mW + 2400 mW into 32 Ω (high gain)
• Noise & distortion: THD+N as low as ~0.00037 %; dynamic range ~124 dB; noise floor ~-124 dB
• Case & appearance: Aluminium chassis, “skylight” top window, available in black or silver finishes
• Dimensions: 21.0 × 18.8 × 4.2 cm
• Weight: 980 g

What’s in the Box

• FiiO K13 R2R unit
• USB-C cable
• AC power cord
• Documentation and safety guide

Use Cases / Ideal For

Great for audiophile desktop setups, headphone enthusiasts who want both power and detailed sound, and anyone who values control over their listening—whether for critical listening, mixing, or casual long sessions.

Compatibility

Compatible with Windows, macOS, Linux; supports USB, optical, coaxial, I²S digital sources; works with balanced or single-ended headphones; supports high and low gain to match sensitivity levels.

Pros & Cons

✅ Pros:

• Warm, natural sound from resistor ladder DAC
• High output power capable of driving demanding headphones
• Flexible inputs/outputs and digital control options
• Premium build and excellent power supply design reduce noise and interference

⚠️ Cons:

• No analog line-level input to digitize analog sources directly
• Large size for a desktop DAC, takes significant desk space
• Bluetooth useful, but wireless streaming can’t match wired fidelity fully

The FiiO K13 R2R stands out as a desktop DAC/amp that delivers both raw technical excellence and musicality. If you want precision, power, and flexibility in one unit, the K13 R2R is a serious contender.