FiiO WARMER R2R Desktop DAC with Tube Buffer

The FiiO WARMER R2R is a desktop digital-to-analog converter designed for listeners who want a richer, more organic sound from their digital sources. By combining a true R2R resistor ladder DAC with a dedicated vacuum tube buffer stage, WARMER delivers a smooth, musical presentation that bridges classic analog character with modern digital convenience. Finished with dual mechanical VU meters, it brings both sound and style to any desktop or hi-fi system.

Features

• True fully differential 24-bit R2R DAC architecture with precision thin-film resistors
• Tube buffer stage using four JJ Electronic E88CC vacuum tubes
• Warm, analog-style sound signature with natural harmonic richness
• NOS (Non-Oversampling) and OS (Oversampling) playback modes
• USB-C, optical, and coaxial digital inputs
• Balanced XLR and unbalanced RCA line outputs usable simultaneously
• Large LED-backlit mechanical VU meters for real-time level display
• Low-noise linear toroidal power supply for stable, clean performance
• Vintage-inspired chassis with ventilation for tube cooling

Specifications

General

• Product Type: Desktop R2R DAC with tube buffer
• Chassis: Metal enclosure with ventilation grilles
• Display: Dual mechanical VU meters with LED backlight
• Dimensions: 223.5 × 213 × 66.8 mm
• Weight: Approx. 2.87 kg

DAC & Processing

• DAC Architecture: Fully differential true 24-bit R2R resistor ladder
• Total Resistors: 192 precision thin-film resistors
• Playback Modes: NOS (Non-Oversampling), OS (Oversampling)

Tube Stage

• Vacuum Tubes: 4 × JJ Electronic E88CC
• Tube Power Supply: Dedicated ±28V rail

Digital Inputs

• USB-C (UAC1.0 / UAC2.0)
• Optical (TOSLINK)
• Coaxial (RCA)

Supported Audio Formats

• USB: PCM up to 384kHz / 32-bit, DSD256
• Coaxial: PCM up to 192kHz / 24-bit
• Optical: PCM up to 96kHz / 24-bit

Analog Outputs

• XLR balanced line out
• RCA single-ended line out

Performance (OS Mode)

• THD+N: ~0.05% @ 1kHz
• SNR: ≥112 dB (RCA), ≥114 dB (XLR)
• Frequency Response: 20Hz–20kHz (±0.6dB)

Power

• Power Supply: Low-noise linear toroidal transformer
• Rated Power Consumption: 46W