The FiiO K11 R2R DAC/Amplifier offers a compelling entry point into the world of high-resolution audio, particularly for users prioritizing speaker systems. This review delves into the performance and capabilities of this budget-friendly device, focusing on its unique R2R DAC architecture and dual output modes. We'll explore its strengths and weaknesses, comparing its sound signature across both headphone and preamplifier applications to determine whether it truly delivers on its promise of audiophile-grade sound at an accessible price.The K11 utilizes a 4-channel, fully differential 24-bit R2R DAC, boasting impressive specifications and a surprisingly rich feature set, including both oversampling and non-oversampling modes. This review examines the device's performance with various high-resolution audio formats and different headphone impedances, comparing its capabilities against other comparable units on the market. We'll discuss the nuances of its sound signature, detailing its strengths and limitations to help potential buyers make an informed decision.
Pros And Cons
- Amazing sounding deck with good tonal balance
- Sounds warm and inviting through the DAC preouts
- Excellent bass output in pre-out mode, textured and extends low
- Rich mid-range sound with dark backgrounds and quiet operation
- Detailed treble without excessive brightness or listening fatigue
- Wide, deep, holographic sound stage and spot-on imaging
- Good value at $142 (sale price) or $175 (retail price)
- Headphone out is less impressive than pre-out; sound can be bright and fatiguing at high volumes
- Uses a switching power supply (reviewer prefers linear)
Read more: Fiio K11 R2R DAC/Amp Review: A Worthy Upgrade or Redundant Luxury?
What is an R2R DAC?
The FiiO K11 utilizes an R2R (Resistor Ladder) DAC, a distinct digital-to-analog conversion method. Unlike conventional DACs employing Delta-Sigma modulation, R2R DACs use a network of precision resistors to directly convert digital signals into analog audio. This approach is often lauded for its purportedly purer and more natural sound signature, although it can be more costly to implement.
The simplicity of the R2R design, relying on only two resistor values (R and 2R), makes it comparatively cost-effective. This is a key factor in the FiiO K11's surprisingly affordable price point. However, it's important to note that the performance of an R2R DAC greatly depends on the quality and precision of these resistors.
The K11 boasts a 4-channel fully differential 24-bit R2R architecture. This means each channel uses 48 precision thin-film resistor arrays, resulting in a total of 192 resistors, carefully selected for their 0.1% tolerance and low temperature drift. This level of precision is vital for the accuracy of the analog signal produced.
Key Features and Specifications
Beyond the R2R DAC, the K11 offers several noteworthy features. It includes dual modes – non-oversampling and oversampling – providing flexibility in audio reproduction. The non-oversampling mode, favored by the reviewer, retains the original sampling rate, preserving sonic authenticity. The unit supports high-resolution audio formats, including PCM 384kHz/24-bit and DSD256.
The K11 utilizes a NJW1195A electronic volume control, offering smooth and precise volume adjustment. Power is provided by a 12V, 2A switching power supply – a point noted by the reviewer as a potential area for improvement, though understandable given the compact size of the device.
Headphone outputs include both 3.5mm and 4.4mm balanced jacks. The unit's capabilities extend beyond headphone amplification, functioning as a DAC with pre-out functionality for connection to external speakers. The reviewer tested it with both headphones and a two-channel speaker system, yielding varying results.
Sound Quality and Performance
When used as a pre-amp with speakers, the K11 impressed the reviewer with its exceptionally rich and detailed sound, particularly in the mid-range and treble. The bass response was described as textured and extended, producing a full, warm sound rarely found at this price point. The soundstage was remarkably wide, deep, and holographic, creating an immersive listening experience that exceeded expectations.
However, the headphone output presented a different story. While the K11 successfully drove high-impedance headphones, it produced a brighter, more fatiguing sound that lacked the warmth and balance of the pre-out mode. Direct comparison with the XDuoo XD-02 headphone amp/DAC revealed a preference for the latter's less fatiguing and warmer sound signature, even if the FiiO K11 provided more power.
Specific musical examples highlighted the K11’s strengths in imaging and detail retrieval, particularly with complex tracks featuring multiple instruments. The reviewer felt that the pre-out performance was exceptional, while headphone amplification needed improvement. The overall sound quality through the pre-outs was deemed ‘lush’ and ‘rich’.
Conclusion
The FiiO K11 R2R DAC/Amplifier offers exceptional value for its price. Its remarkable performance as a pre-amplifier, delivering a rich, detailed, and immersive soundstage, is its major strength. The R2R DAC shines when powering speakers.
However, its headphone amplifier section suffers from brightness and potential listening fatigue, particularly at higher volumes. While powerful enough, its sound profile is less refined compared to dedicated headphone amps in the same price range.
Overall, the FiiO K11 is a strong recommendation for budget-conscious audiophiles prioritizing speaker setups or those seeking a cost-effective introduction to the world of R2R DAC technology. Consider its limitations with headphones before purchasing.