FiiO K13 R2R — Fully Differential 24-Bit R-2R Desktop DAC & Headphone Amplifier
Fully Differential True 24-Bit R-2R Resistor Arrays DAC
The K13 R2R employs FiiO’s proprietary four-channel fully differential 24-bit R-2R resistor-ladder DAC, composed of 48 precision thin-film resistors per channel—a total of 192 resistors across four channels. Each resistor features 0.1% accuracy and low temperature drift (30 ppm), ensuring ultra-precise performance.
This R-2R architecture allows the K13 R2R to deliver a rich, natural, and musical sound, while the NOS (Non-Oversampling) and OS (Oversampling) modes provide two distinct listening experiences—one more organic and analog-like, the other more analytical and detailed.
Preamplifier + Power Amplifier Output — A True Desktop Decoding Hub
With its wide array of inputs and outputs, the K13 R2R serves as both a preamplifier and a power amplifier, accommodating diverse listening setups.
It supports PCM 384 kHz/32-bit and DSD256 decoding, processing high-resolution audio with ease for exceptional clarity and detail.
Specially Designed Power Supply
The K13 R2R integrates a dual DC/AC power design. Its built-in 30 W switching power supply, protected by a nickel-plated alloy shield, provides superior anti-interference performance and a cleaner power source.
An external DC power input is also available, allowing pairing with a high-performance linear power supply for alternative tonal characteristics.
Internally, FiiO spares no effort in power design: up to 18 low-noise LDO regulators and 5 DC-DC converters form a multi-rail power system, ensuring robust and stable current delivery.
Premium ELNA RA3 series silk-film capacitors and specialized tantalum audio capacitors maintain a pure and stable power supply, contributing to the K13 R2R’s warm and natural sonic signature.
Color: Black, Silver
Main control chip (MCU): ESP32-S3
USB chip: XMOS XU316
DAC: Fully differential true 24bit R2R DAC resistor arrays
Volume control chip: NJW1195AV
R2R and LFP op-amp: OPA1678*2
R2R and LFP op-amp: TPA6120A2 2
Headphone amplifier: OPA16782 + TPA6120A *2
USB input: 384kHz/32bit, DSD256
Coaxial input: 192kHz/24bit, DSD64
Optical input: 192kHz/24bit, DSD64
USB connector: Dual Type-C
Display: Custom LCD
Power input: AC 100-240V 50/60Hz; DC 12V/2.5A
Dimensions: About 210×189×42 mm
Gross weight: About 2080 g (including feet)
Net weight: About 980 g
Single-ended power output: L+R=1220 mW + 1220 mW (32 Ω, High gain)
Balanced power output: L+R=2400 mW + 2400 mW (32 Ω, High gain)
Headphone impedance range: 16 Ω – 600 Ω (recommended ≤ 250 Ω)
Line out level (Single-ended): 2.0 Vrms (Line Out), 2.1 Vrms (Pre-Out)
Line out level (Balanced): 4.0 Vrms (Line Out), 4.2 Vrms (Pre-Out)
SNR: ≥ 116 dB (A-weighted)
Noise floor: PO < 6 µV (A-weighted, M gain); BAL < 8 µV (A-weighted, M gain)
Output impedance: PO < 0.2 Ω (1 kHz), BAL < 1 Ω (32 Ω load)
THD+N: About 0.0013% (1 kHz, 4 dBu @ 32 Ω load)
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