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FiiO K11 R2R

A compact hub for USB computer audio, optical or coaxial digital sources, headphones, and an RCA-connected stereo or powered speakers.

What it is

Desktop DAC and headphone amplifier

InputsUSB-C data, optical, coaxial

Outputs6.35 mm headphone, 4.4 mm balanced headphone, RCA line/pre-out, coaxial out in USB mode

USB decodingUp to PCM 384 kHz/32-bit and DSD256 (manufacturer specification)

Firmware noteFiiO's public K11 R2R support path includes M79, which adds a selectable 1-bit DSD native-decoding mode. It is a manual PC update, not OTA; verify the exact model and installed version first.

Size5.79 × 5.24 × 1.27 in / 147 × 133 × 32.3 mm

Weight0.93 lb / about 420 g

PowerExternal DC 12 V/2 A adapter; confirm the supplied cord/adapter for the U.S. unit before purchase

Best for

Desktop headphones from a computer

Adding a DAC/preamp to powered speakers or an existing amplifier

Users who specifically want selectable NOS/OS conversion

Not ideal / confirm first

No Bluetooth, Wi-Fi, HDMI ARC, or mobile control app

It does not directly drive passive speakers

FiiO documents firmware updating with a Windows 10-or-later computer; do not use files for the standard K11 or another model

RoomCircuit has not tested M79, 1-bit DSD playback, USB-driver behavior or wake behavior

Evidence & further reading

Check the operating mode, not just the specification.

SoundPath Lab labels this as primary-source-verified guidance, not hands-on testing of this exact DAC. RoomCircuit has not independently verified the firmware or listening result.

Page reviewed October 4, 2026.

Primary source

Manufacturer documentation

Specifications are summarized from the linked manufacturer page and were not measured by RoomCircuit.

FiiO K11 R2R official specifications Related setup guide