A new way to hear your music

The K13 R2R is a fully-balanced desktop DAC and headphone amplifier that leans on FIIO’s proprietary 24-bit R2R resistor arrays, a powerful 2400mW+2400mW balanced output, and a wealth of tuning and connectivity options. With dual NOS/OS modes, LDAC Bluetooth, and a precision 10-band PEQ, it gives you control over both the flavor and fidelity of your music. 

Fully differential 24-bit R2R DAC

At the heart of the K13 R2R are four channels of resistor arrays: 48 precision-thin film resistors per channel, 192 in total. Each resistor is matched to 0.1% accuracy with ultra-low temperature drift. The result is a true 24-bit fully differential R2R DAC that delivers a sound signature that’s rich, organic, and natural. Lower FFT harmonics mean darker backgrounds and less noise, so what you hear is only the music.

Double the fun with Dual NOS/OS modes

NOS (Non-Oversampling) Mode: Maintains the original sampling rate for decoding, preserving the authentic sound and allowing you to enjoy an organic and captivating musical experience. OS (Oversampling) Mode: Upsamples globally to a high sampling rate of 384kHz, for superior audio performance and even more refined, clear sound.

Preamplifier + power amplifier output

With a wide variety of inputs and outputs, this unit functions as both a preamplifier and a power amplifier, catering to various listening preferences. It also supports PCM 384kHz/32bit and DSD256 decoding, allowing it to effortlessly process high-resolution audio signals to deliver rich sonic detail and for an outstanding listening experience.

10-band high-precision PEQ

Fine-tune the sound to your taste. The built-in parametric EQ, powered by the XMOS XU316 chip and FIIO’s proprietary tuning algorithm, supports 10-band adjustment across all modes. Use the FIIO Control app or web interface to load presets like “Retro PEQ,” match headphone response curves, or share your own EQ curves. 

Balanced from start to finish

From DAC to LPF to volume control and headphone amp, the entire circuit is fully differential. That means minimal distortion, excellent interference rejection, and a dynamic range that stays intact across the chain. Add gain control, headphone protection, and POP noise elimination, and you get a circuit that’s as safe as it is clean.

Specially-designed power supply

• DC/AC dual supplies: The 30W internal supply is shielded for reduced interference, while an external DC input lets you experiment with higher-end linear supplies.
  
• Multi-rail design: 18 low-noise LDOs and 5 DC-DC converters keep each section fed with clean power.
  
• Audiophile-grade capacitors: ELNA RA3 silk-film electrolytics and specialized tantalum caps help deliver warmth and stability.
  

Power on tap

With 2400mW+2400mW into 32Ω on the balanced outputs, the K13 R2R has the muscle to drive high-impedance headphones with ease while still being gentle enough for sensitive IEMs. It reveals detail without losing control.

3 gain levels + 3 independent volume curves

The 3 independent gain levels and volume curves allow the K13 R2R to give you a better listening experience with various types of headphones, whether you are using sensitive earphones or harder to drive over-ear headphones.

Product highlights

• Fully-differential 24-bit R2R DAC with 192 precision resistors
  
• Dual NOS and OS decoding modes
  
• PCM 384kHz/24bit and DSD256 support
  
• XLR and RCA preamp/line outputs
  
• 10-band high-precision PEQ with app and web control
  
• Fully balanced audio amplifier circuit with protection features
  
• DC/AC dual power supplies with shielded internal PSU and external DC input option
  
• ELNA RA3 audiophile-grade capacitors
  
• 2400mW+2400mW balanced output into 32Ω
  
• Custom HD LCD display with always-on capability
  
• Minimalist aluminum design with skylight accent
  
• Bluetooth 5.4 with LDAC/AAC/SBC support
  
• Adjustable RGB lighting and timer shutdown
  

Specs