FiiO K13 R2R Hi-Fi kuulokkeiden esivahvistin Black

FiiO K13 R2R — Desktop R2R DAC and Headphone Amplifier

Built around a fully differential 24-bit R2R resistor array, the FiiO K13 R2R is a desktop DAC and headphone amplifier prized for its natural, analog-like musicality. Each channel uses 48 precision thin-film resistors with 0.1% accuracy and 30ppm temperature drift, totaling 192 across four channels. Supporting PCM up to 384kHz/32-bit and DSD256 over USB, this model functions as both a preamplifier and dedicated headphone amp. Desktop listeners seeking R2R warmth without sacrificing modern connectivity will appreciate this choice.

What Sets the K13 R2R Apart

Unlike most R2R designs that use single-ended topology, this unit runs a fully differential signal path from the resistor array through the LPF, volume control, and headphone amp — lowering noise floor and FFT harmonics for a darker background behind the music. A built-in 30W switching supply sits under an alloy nickel-plated shield, while an external DC input (12V/2.5A) lets owners swap in a linear supply for a different sonic flavor. ELNA RA3 audiophile-grade silk-film capacitors and specialized audio tantalum capacitors complete the analog stage.

R2R DAC Architecture — True 24-Bit Discrete Conversion

The discrete resistor array delivers the harmonic texture R2R is known for, while the XMOS XU316 USB receiver handles incoming data with bit-perfect precision.

• Discrete conversion for organic tonality is achieved through a fully differential true 24-bit R2R resistor array featuring 192 resistors with 0.1% accuracy and 30ppm drift.
• USB Decoding: 384kHz/32-bit PCM and DSD256 native — handles the highest-resolution studio masters
• Coaxial Decoding: 192kHz/24-bit PCM and DSD64 — pairs with legacy CD transports and streamers
• Optical Decoding: 192kHz/24-bit PCM — jitter-free connection to TVs and consoles

Headphone Amplifier Output — Drive for Every Impedance

Three gain levels with independent volume curves adapt from sensitive IEMs to high-impedance audiophile headphones without channel imbalance.

• Balanced Output (4.4mm): 2400mW+2400mW @ 32Ω, 600mW+600mW @ 300Ω — drives planars and demanding dynamics with ease
• Single-Ended Output (6.35mm): 1220mW+1220mW @ 32Ω, 150mW+150mW @ 300Ω — ample headroom for most headphones in this segment
• Output Impedance: PO <0.4Ω, BAL <1Ω — preserves damping factor for accurate bass control
• THD+N: ~0.0173% (1kHz/-6dB @ 32Ω) — clean amplification with minimal coloration

Inputs, Outputs, and Power — A True Desktop Hub

Enough digital and analog I/O to anchor a computer, CD transport, TV, and powered monitors simultaneously.

• Bluetooth: 5.4 with SBC, AAC, and LDAC — wireless Hi-Res streaming from phones and tablets
• USB Ports: Dual Type-C — two sources stay connected, first-come-first-served
• Line Outputs: XLR balanced + RCA single-ended — feeds a power amp or active monitors
• Power Supply: AC 100-240V or DC 12V/≥2.5A, 18 LDOs + 5 DC-DC converters — multi-rail clean power with linear-supply upgrade path
• Dimensions: 210 × 188 × 42 mm — compact desktop footprint
• Weight: ~980 g — substantial chassis that stays planted on the desk