By: CE Critic

FiiO, known for its rapid product development cycles, has unveiled a compelling addition to its desktop audio lineup: the K11 R2R. This DAC/headphone amplifier combines affordability with the sought-after sonic characteristics of R2R (Resistor Ladder) architecture, making it a potential game-changer for audiophiles on a budget.

R2R Revival: A Different Digital-to-Analog Approach

While Delta-Sigma DACs dominate the market, R2R designs have garnered a dedicated following. Enthusiasts often cite their smoother, more organic sound signature, even if their measured performance doesn't always align with traditional metrics. The K11 R2R leverages this technology, employing a 24-bit R2R array with 192 high-precision resistors (48 per channel) to convert digital audio signals into their analog counterparts.

Versatility and Performance

The K11 R2R offers a wide range of connectivity options, catering to both headphone listeners and those who want to integrate it into a larger hi-fi system:

• Digital Inputs: USB-C, Toslink optical, coaxial
• Analog Outputs: 6.35mm (single-ended), 4.4mm balanced, RCA stereo (for line-out)

Decoding capabilities are robust, supporting PCM up to 32-bit/384kHz and native DSD256. A unique feature is the selectable NOS (Non-Oversampling) mode, allowing for bit-perfect playback or upsampling to 384kHz for potentially enhanced detail retrieval.

Amplification and Customization

The integrated headphone amplifier is no slouch, utilizing TI OPA1642 op-amps for filtering and dual SGM8262 op-amps to deliver up to 1.3 Watts of power. Three gain modes cater to headphones of varying sensitivities, ensuring a good match for your favorite cans. A front-panel LCD provides essential information like volume level and playback format.

Thoughtful Design and User Experience

The K11 R2R sports a sleek design with an intuitive multi-function volume knob that doubles as a power switch and menu navigator. Double-pressing the knob allows for quick switching between Line Out, Pre-out, and Power Out modes. An RGB-illuminated FiiO logo serves as a visual indicator of the current sample rate.

Technical Specifications

• DAC: Fully differential 24-bit R2R
• Control Chip: GD32F303RET6
• Output Power (6.35mm SE): ≥460mW per channel @ 32Ω
• Output Power (4.4mm BAL): ≥1300mW per channel @ 32Ω
• Input Decoding (USB): PCM 384kHz/32-bit, DSD256
• Display: 1.1-inch LCD VA segment
• Dimensions: 147 x 133 x 32.3mm
• Weight: 420g
• Available Colors: Obsidian Black, Midnight Silver (Red coming later)

Availability and Pricing

FiiO expects to release the K11 R2R in late July 2024, with an MSRP of $169 / £149. This competitive price point makes it one of the most affordable R2R DACs on the market, potentially opening the door for a wider audience to experience this unique digital-to-analog conversion technology.

Who Should Consider the K11 R2R?

• Headphone enthusiasts seeking a taste of R2R sound without breaking the bank.
• Desktop audio users looking for a versatile DAC/amp combo with multiple input/output options.
• Budget-conscious audiophiles who prioritize sound quality and value.

Conclusion

The FiiO K11 R2R represents a compelling blend of features, performance, and affordability. While we await in-depth reviews to assess its sonic merits, its unique R2R DAC, ample power, and flexible connectivity make it a promising contender in the crowded desktop audio market. We look forward to the reviews and CE Critic Score.