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Is the FiiO K11 R2R the Best Value R2R DAC in 2024?

Uzair Asif

July 15, 2024

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FiiO has unveiled the R2R version of its K11 DAC/headphone amplifier. Unlike its Delta-Sigma counterpart that uses Cirrus Logic silicon, the K11 R2R features a 24-bit R2R resistor array for decoding digital audio signals. It supports three digital inputs: USB-C, TOSLINK, and coaxial. Additionally, it has a pair of RCA sockets for connecting to an external amplifier.

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The FiiO K11 R2R stands out for its innovative 24-bit R2R resistor array, which is expertly engineered to decode digital audio signals. This DAC/headphone amplifier offers a superior listening experience, delivering rich and immersive sound.

Precision and Performance

The K11 R2R features dual NOS/OS modes, allowing users to switch between non-oversampled sound and a high 384kHz sampling rate. It supports true 24-bit decoding for PCM audio up to 32-bit/384kHz and native DSD256 files, catering to both audiophiles and casual listeners alike.

Built for Quality

Designed with a specialized audio circuit, electronic volume control, and adjustable gain levels, the K11 R2R ensures reliable and top-notch performance. For those seeking exceptional audio quality, the FiiO K11 R2R is the perfect choice.

1. 24-Bit R2R Resistor Array: The K11 R2R offers a fully differential 24-bit R2R DAC. This unique configuration includes 192 precision thin-film resistor arrays (48 per channel) with an impressive 0.1% tolerance and low temperature drift. The result? Captivating sound quality that audiophiles will appreciate.
2. Dual NOS/OS Modes:
   • NOS (Non-Oversampling) Mode: In this mode, the K11 R2R maintains the original sampling rate during decoding, preserving authentic sound.
   • OS (Oversampling) Mode: Here, the K11 R2R upsamples globally to a high 384kHz sampling rate, delivering superior audio performance.
3. True 24-Bit Decoding: The K11 R2R supports PCM audio signals up to 32-bit/384kHz and native DSD256 decoding. Whether you’re listening to high-resolution tracks or DSD files, this DAC delivers excellent capabilities and outstanding sound quality.
4. High-Quality Electronic Volume Control: The NJW1195A electronic volume controller ensures precise volume adjustments without compromising sound quality.
5. Flexible Gain Levels and Volume Curves: With three independent gain levels and volume curves, the K11 R2R adapts to various headphones—whether you’re using sensitive earphones or power-hungry over-ear headphones.
6. Specially-Designed Audio Circuit:
   • The audio signal flows through a USB interface processor, an FPGA, and finally to the R2R DAC for 4-channel output.
   • Two Ti OPA1642 op-amps handle low-pass filtering and analog signal conversion.
   • The output stage features two SGM8262 op-amps for 4-way phase inversion and amplification.
   • A specially-designed headphone protection circuit ensures reliability.

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