FiiO K11 R2RDAC & Headphone Amplifier

FiiO K11 R2R DAC & Headphone Amplifier

Bring analog soul and desktop muscle to your headphones

If you crave the ease and clarity of a modern desktop DAC/amp but miss the texture and natural flow of classic hi‑fi, the FiiO K11 R2R is built for you. Its fully differential 24‑bit R2R ladder DAC delivers a richly organic presentation, while a robust headphone stage with balanced output brings authority and headroom to everything from sensitive IEMs to full‑size planars—all in a sleek, compact chassis that fits any desk. Dual NOS/OS modes, three gain levels, and intuitive one‑knob control let you tailor the experience to the music, your headphones, and your mood.

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Why Audiophiles Choose This Product

• • Sound quality, reimagined with R2R
  • The K11 R2R’s self‑developed, four‑channel fully differential 24‑bit R2R ladder—192 precision thin‑film resistors matched to 0.1%—prioritizes tone, timbre, and timing for a natural, engaging sound that feels alive. Switch between NOS for a purist, unfiltered character or OS for a cleaner, ultra‑refined presentation.
• • Engineering that matters
  • A carefully staged signal path routes USB/coax/optical through FPGA processing to the R2R DAC, then to low‑noise OPA1642 filtering and NJW1195A electronic volume control, with SGM8262 output buffers for power and poise. A multi‑rail power design with 17 low‑noise LDOs and custom Beryl solid capacitors keeps the background black.
• • Everyday usability without compromise
  • One multifunction knob handles power, menus, volume, and quick switching between headphone out (PO), variable pre‑out (PRE), and fixed line out (LO). A bright, durable front display shows gain, sample rate, and mode, while the top RGB logo can be set to indicate sample rate—or turned off entirely.
• • Versatile connectivity for any setup
  • Feed it via USB‑C, optical, or coaxial; drive headphones from 6.35 mm single‑ended or 4.4 mm balanced; run powered speakers from RCA line out; or pass digital via coax out (USB mode). USB supports up to 384 kHz/32‑bit PCM and DSD256; optical and coax support up to 96 kHz/24‑bit and 192 kHz/24‑bit respectively. Note: DSD is converted to PCM prior to ladder decoding, which aligns with the 24‑bit R2R architecture.
• • Distinctive value and identity
  • The K11 R2R is FiiO’s first desktop DAC/amp to integrate a four‑channel, fully differential 24‑bit R2R DAC—bringing classic ladder‑DAC character to a compact, modern, and highly usable desktop component. Available in multiple finishes to complement your space.

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What’s Included

• • Main Product: FiiO K11 R2R desktop DAC & headphone amplifier (true 24‑bit fully differential R2R DAC; dual NOS/OS modes)
• • Primary Accessory: USB‑A to USB‑C data cable (digital input)
• • Secondary Items: External 12V/2A power adapter with AC cable; 6.35 mm headphone adapter
• • Documentation: Quick start guide; warranty card

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Technical Specifications

Specification	Value	Notes
Product Type	Wired desktop DAC/headphone amplifier	USB‑C, optical, coaxial inputs; 4.4 mm/6.35 mm headphone outs; RCA line out; coaxial digital out (USB mode only)
DAC Architecture	Fully differential 24‑bit R2R ladder (192 matched resistors, 0.1%/30 ppm)	Self‑developed four‑channel design for lower noise and a “darker” background.
Operating Modes	NOS and OS (upsampling to 384 kHz)	Two distinct sonic flavors; easy to toggle from front panel.
USB Decoding	Up to 384 kHz/32‑bit PCM, DSD256 (converted to PCM for R2R decoding)	Class‑compliant; simple setup on modern OS.
Digital Inputs	USB‑C, Optical, Coaxial	Optical up to 96 kHz/24‑bit; coaxial up to 192 kHz/24‑bit.
Line/Pre Outputs	RCA line out; RCA coaxial out (USB mode only)	Fixed or variable analog output; digital pass‑through when USB is source.
Headphone Outputs	6.35 mm single‑ended; 4.4 mm balanced	Front panel; quick PO/PRE/LO switching.
Output Power (SE)	460 mW + 460 mW @ 32 Ω; 50 mW + 50 mW @ 300 Ω	High‑gain, OS mode.
Output Power (BAL)	1300 mW + 1300 mW @ 32 Ω; 220 mW + 220 mW @ 300 Ω	Headroom for planars and dynamics.
Volume/Amplification	NJW1195A 4‑ch electronic volume; 3 gain levels with 3 volume curves	Precision control from IEMs to hard‑to‑drive cans.
Performance (Line Out)	THD+N ≈ 0.025% (1 kHz, 0 dB @ 10 kΩ); SNR ≥ 115 dBA	Manufacturer measurements.
Performance (HP Out)	THD+N ≈ 0.025% (1 kHz @ 32 Ω); SNR ≥ 115 dBA	Manufacturer measurements, OS mode.
Output Impedance	<1 Ω (SE); <1.5 Ω (BAL)	Helps maintain intended headphone tonality.
Dimensions/Weight	147 × 133 × 32.3 mm; ~420 g	Slim, space‑saving desktop footprint.
Power	External 12V/2A adapter	Clean, dedicated supply with multi‑rail regulation.

All specifications per FiiO’s published parameters and product documentation.

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Professional Recognition

• • Press coverage: What Hi‑Fi highlighted K11 R2R’s four‑channel, fully differential 24‑bit R2R design and its aim for a smoother, more natural output in a compact desktop form.
• • Official release brief: FiiO positions the K11 R2R as its first desktop DAC/amp to integrate this ladder architecture, supporting PCM 384 kHz/24‑bit and DSD256 (converted to PCM for R2R decoding).
• • Heritage: FiiO, founded in 2007 and headquartered in Guangzhou, has earned a global following for accessible, high‑performance desktop and portable audio solutions.
• • Innovation highlights: FPGA preprocessing, NJW1195A electronic volume, multi‑rail low‑noise power with 17 LDOs, and shielding/thermal design show careful system‑level engineering—rare at this size.

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The Bottom Line

The FiiO K11 R2R merges a truly modern desktop experience with the musicality that draws enthusiasts to ladder DACs. It’s compact yet capable, intuitive yet configurable, and designed from the power supply up to keep noise out and emotion in. If you want an easy‑to‑love desktop DAC/amp that delivers R2R character without sacrificing day‑to‑day usability, the K11 R2R belongs on your shortlist.

Notes and best practices:

• For DSD playback, set your source to Native/DoP as appropriate; the K11 R2R will internally convert to PCM to align with its 24‑bit ladder.
• Use OS mode for the flattest response and NOS mode when you prefer a more relaxed, unfiltered feel.

Ready to bring analog‑like ease and impact to your desktop? The K11 R2R makes it simple—and deeply satisfying.