FiiO K11: Compact Desktop R2R DAC & Headphone Amplifier (Black)

Overview

The FiiO K11 combines a compact desktop footprint with a sophisticated R2R DAC and headphone amplifier. At its heart sits a four-channel fully differential 24-bit R2R resistor array, built from 192 high-precision ultra-thin film resistors with 0.1% accuracy. This architecture aims to deliver a clean, low-noise signal path that helps instruments and voices stay crisp against a dark background, elevating the listening experience across genres.

Two ways to shape your sound: NOS and OS

Switchable operating modes let you tailor the character of your listening session. In NOS (Non-Oversampling) mode, the device preserves the original sampling behavior, producing a musical and relaxed presentation. In OS (Oversampling) mode, signals are processed through oversampling up to 384 kHz, revealing extra detail and clarity. You can freely switch to suit tracks or headphones.

• NOS mode emphasizes musicality and flow.
• OS mode enhances detail, air, and precision in the upper frequencies.

Power and drive for demanding headphones

The K11 houses a purpose-built amplifier section with TI OPA1642 low-pass filters and dual SGM8262 operational amplifiers. With up to 1300 mW per channel, it has ample headroom to drive a wide range of headphones. A precision NJW1195A digital volume control provides precise volume steps with low distortion across channels.

• Three gain levels help pair with sensitive IEMs or high-impedance cans.
• The low-noise supply design minimizes ripple for cleaner highs and defined bass.

Two headphone outputs, one versatile chassis

A single-ended 6.35 mm output and a balanced 4.4 mm output on a compact desktop unit give you flexible listening options. Whether you plug in studio cans or pocket-friendly IEMs, you can enjoy high-resolution audio across formats with ease.

High-resolution audio processing

The K11 supports PCM up to 32-bit/384 kHz and DSD up to DSD256, with DSD offered in native output mode and internally converted to PCM for R2R processing. This enables faithful reproduction of a wide range of sources, from high-res streams to digital files.

• DSD256 support for enthusiasts who use lossless files.
• Internal PCM conversion preserves compatibility with the R2R path.

Clean power, quiet operation

A professionally designed low-noise power supply features 17 LDO regulators and two DC-DC converters, plus an external 12 V supply. This design reduces noise and distortion, helping the signal path stay faithful to the source and maintaining a controlled sonic backdrop.

What to connect and how it fits your desk

Crafted for desktop setups, the K11 blends well with a range of audio gear, from compact DACs to high-end headphones. Its compact dimensions and sturdy build make it a practical upgrade for home listening, a dedicated workspace, or a compact studio desk.