FiiO · Verified profile
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; see firmware notes for current DSD behavior
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
Firmware updating currently requires a Windows 10-or-later computer according to FiiO
Primary source
Manufacturer documentation
Specifications are summarized from the linked manufacturer page and were not measured by RoomCircuit.