FiiO K11 R2R Compact Desktop DAC and Headphone Amplifier, Silver - Secondhand

Name: FiiO K11 R2R Compact Desktop DAC and Headphone Amplifier, Silver - Secondhand
Brand: FiiO
Price: 127.75 EUR
Availability: Discontinued

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Key Features

Good condition secondhand product. Fully functional, inspected by our experts
R2R ladder design for analogue-style sound
1300mW balanced output powers demanding headphones with ease
Supports 32-bit/384kHz PCM and native DSD256 audio decoding
Features three gain levels and precision volume control
Balanced and single-ended outputs for flexible setups

Secondhand condition of this item: GOOD

This product is secondhand and has been inspected by our team of product experts to ensure it is in full working order, and meets our high quality standards.

A product in good condition is clearly used, with noticeable marks, scratches or signs of wear. While these cosmetic imperfections are more apparent, they do not affect the items functionality or sound quality.

Any accessories or software mentioned outside of this condition report may not be included with this item for sale.

Product Ref: 376345

Full Description

View Full Description

Fully Differential 24-bit R2R DAC

The K11 R2R features a self-developed four-channel, fully differential DAC with two resistor arrays per channel. That’s forty-eight resistors per channel—one hundred ninety-two in total—each with 0.1% precision and low temperature drift. This architecture reduces noise and distortion, creating a silent background and cleaner output. The result is a smoother and more natural sound, giving you a more analogue-like listening experience.

Dual NOS/OS Operating Modes

You can switch between NOS (non-oversampling) and OS (oversampling) modes depending on your listening preference. NOS mode keeps the signal at its native sample rate, offering a more laid-back, organic sound. OS mode upsamples everything to 384kHz, delivering more detailed and transparent audio. This gives you flexibility to tune the output to match your headphones, source material, or just your personal preference.

High Output and Versatile Connectivity

With 1300mW per channel under 32 ohms via the 4.4mm balanced output, the K11 R2R is powerful enough to drive demanding over-ears, while still offering low-gain modes suitable for sensitive IEMs. You also get both balanced and single-ended headphone outputs (4.4mm and 6.35mm), RCA line-out, optical and coaxial digital inputs, and a USB-C interface. Three gain levels and a low-noise power supply give you distortion-free sound across all outputs.

Features

Fully differential 24-bit R2R DAC with resistor ladder architecture
NOS (Non-Oversampling) and OS modes for different sound profiles
1300mW output via 4.4mm balanced headphone out
Three gain levels suit IEMs and high-impedance headphones
Supports 32-bit/384kHz PCM and native DSD256 decoding
Low-noise multi-channel power supply with external 12V adapter
NJW1195A volume control chip for precise, low-distortion adjustment
Balanced and single-ended outputs for flexible connectivity
Professionally designed amp circuit with OPA1642 and SGM8262 op-amps
Built-in DC protection and pop-noise suppression for safe headphone use
Custom LCD screen with sampling rate and output indicators
RGB logo light shows sampling rate and is fully customisable

What's in the Box?

FiiO K11 R2R Headphone Amp/DAC
Power adapter (incl. AC cable)
USB A-C cable
6.35mm headphone adapter
Quick start guide
Warranty card

Specifications

General

Name/Model	K11 R2R
Colours	Black/Silver/Red
Dimensions (including feet, W x D x H)	147 x 133 x 32.3 mm
Weight	approx. 420g
Gain	L/M/H
Adaptive impedance	PO: 8 150Ω BAL: 8 350Ω
Oversampling setting	OS/NOS
FiiO Control	N/A
Max sampling rate	384kHz-32bit/DSD256 (USB DAC) 192kHz-24bit (Coaxial) 96kHz-24bit (Optical)
Sampling rate indication	LOGO indicator light shows as default: Cyan: 48KHz and below Yellow: above 48kHz Green: DSD
Firmware upgrade	Supports upgrade through USB

Buttons and Ports

Volume control	Volume knob
Knob	Encoder knob (including volume adjusting and menu confirming)
Single-ended line-out	RCA port
Digital coaxial in	RCA port
Balanced out	Standard 4.4mm port
USB	Type-C (data transmission)
Digital optical in	Optical port
Digital coaxial out	RCA port (only works in USB mode)
Headphone out	Standard 6.35mm port

Power Supply Parameters

Power supply	DC 12V/2A
Battery capacity	No battery

Audio Parameters

Parts of performance and parameters of Line-out output (RCA, OS mode)

THD+N & Noise	About 0.025% (1kHz/0dB@10KΩ)
Crosstalk	≥111dB
Frequency response	20Hz 50kHz: damping<1.2dB 20Hz 20KHz: damping<0.2dB
SNR	≥115dB (A-weighted)
Noise floor	<5.1uV (A-weighted)
Dynamic range	≥107dB
Line output level	2.7Vrms

Parts of performance and parameters of headphone output (6.35mm, OS mode)

Output power	L+R≥660mW +660mW(16Ω, THD+N<1%) L+R≥460mW +460mW(32Ω, THD+N<1%) L+R≥50mW+50mW (300Ω, THD+N<1%)
Channel crosstalk	≥72dB
Frequency response	20Hz 50kHz: damping<1.3dB 20Hz 20KHz: damping<0.2dB
THD+N	About 0.025% (1kHz/0dB@32Ω)
SNR	≥115dB (A-weighted)
Noise floor	<7.2uV (A-weighted)
Dynamic range	≥107dB
Output impedance	<1Ω
Peak output voltage	11Vp-p

Parts of performance and parameters of headphone output (4.4mm, OS mode)

Output power	L+R≥520mW+520mW (16Ω, THD+N<1%) L+R≥1300mW+1300mW (32Ω, THD+N<1%) L+R≥220mW+220mW (300Ω, THD+N<1%)
Channel crosstalk	≥107dB
Frequency response	20Hz 50kHz: damping<1.3dB 20Hz 20KHz: damping<0.2dB
THD+N	About 0.025% (1kHz/-11.6dB@32Ω)
SNR	≥115dB (A-weighted)
Noise floor	<14.1uV (A-weighted)
Dynamic range	≥107dB
Output impedance	<1.5Ω
Peak output voltage	23Vp-p

Product Information

Product code	FIIOK11-R2R-SILVER
EAN	6953175710738

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