FiiO K13 R2R – Balanced desktop R2R DAC and amp

The FiiO K13 R2R is a fully balanced desktop DAC and headphone amplifier built around a discrete R2R resistor-ladder converter. It pairs a warm, organic R2R character with enough clean power to drive demanding headphones, plus the inputs to sit at the centre of a desktop hi-fi or headphone rig.

Key Features

• True 24-bit fully differential R2R ladder DAC: A four-channel resistor array with 48 precision thin-film resistors per channel (192 total), 0.1 percent accuracy and low 30 ppm drift for a natural, musical sound.
• NOS and Oversampling modes: Choose NOS for unaltered R2R tone, or oversampling at 384 kHz for extra clarity and detail.
• High-power balanced output: Up to 2400 mW + 2400 mW into 32 Ω balanced and 1220 mW + 1220 mW single-ended, with three gain levels for high-impedance headphones.
• Wide digital connectivity: Dual USB-C, coaxial and optical inputs plus Bluetooth 5.4 with LDAC, AAC and SBC.
• Full output set: 4.4 mm balanced and 6.35 mm single-ended headphone outs, plus balanced XLR and RCA line/pre-outs to feed active speakers or a power amp.
• 10-band PEQ and digital filters: Tune the sound with a 10-band parametric EQ in the FiiO Control app, selectable digital filters, and an HD LCD showing sample rate, gain and output mode.

Customer Benefits

The K13 R2R gives you the warmth and nuance of a resistor-ladder DAC without giving up power or flexibility. Balanced and single-ended outputs drive everything from sensitive IEMs to 600 Ω studio headphones, while the line and pre-outs let it double as the heart of a desktop speaker system. Switch between NOS and oversampling, dial in the parametric EQ, and match gain to your headphones to land exactly the tone you want, from relaxed listening to detailed, analytic playback.

Quick Specs

• DAC type: Fully differential 24-bit R2R resistor ladder (192 thin-film resistors)
• Supported formats: PCM up to 384 kHz/32-bit, DSD up to DSD256 (USB); coaxial 192 kHz/24-bit, optical 96 kHz/24-bit
• Headphone outputs: 4.4 mm balanced and 6.35 mm single-ended
• Line outputs: Balanced XLR and RCA (switchable line-out/pre-out)
• Output power: 2400 mW + 2400 mW balanced; 1220 mW + 1220 mW single-ended into 32 Ω
• Bluetooth: 5.4 with LDAC, AAC and SBC
• Signal-to-noise ratio: 116 dB or higher (A-weighted)
• Dimensions and weight: 21.0 × 18.8 × 4.2 cm, 980 g

In the Box

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

Ideal For

Audiophile desktop setups, headphone enthusiasts who want both power and R2R warmth, and listeners who want one hub for wired and Bluetooth sources.

Compatibility

Works with Windows, macOS and Linux over USB, plus coaxial, optical and Bluetooth sources; pairs with balanced or single-ended headphones, active speakers or a power amp via the line/pre-outs.

Pros and Cons

✅ Pros:

• Warm, natural sound from a true R2R resistor-ladder DAC
• High balanced output drives demanding, high-impedance headphones
• Flexible I/O with balanced and single-ended outs plus line/pre-outs
• Bluetooth 5.4 with LDAC alongside high-res wired inputs

⚠️ Cons:

• No analog input, so it cannot digitise turntables or other line sources
• Large desktop footprint and 980 g weight take real desk space
• High-res PCM and DSD only over USB; optical caps at 96 kHz

With its R2R warmth, high-power balanced amp and full set of inputs and outputs, the FiiO K13 R2R works as a complete desktop centrepiece.