FiiO has been a respected name in the audio world for over a decade, consistently delivering high-quality equipment at accessible prices. Known for models ranging from the E6 portable amplifier to their latest desktop products, FiiO’s latest offering, the FiiO K11, has created a buzz for its impressive power output and versatile features. Priced around $129, the K11 aims to deliver high performance without a hefty price tag. This review delves into the K11’s build quality, specifications, performance, and how it stacks up against competitors in its price range.
Technical Specifications
| Specification | Details |
| Model | FiiO K11 |
| Price | $129 |
| Build Material | Metal |
| Inputs | USB-C, Optical, Coaxial |
| Outputs | Line Output, Headphone Output |
| Supported Audio Formats | PCM up to 384kHz/32bit, DSD256 |
| Gain Levels | 3 (Low, Medium, High) |
| Power Output | 1.5W (32Ω load) |
| THD+N (Total Harmonic Distortion + Noise) | <0.001% |
| Signal-to-noise ratio (SNR) | 118dB |
| Frequency Response | 20Hz – 80kHz |
| Dimensions | 112mm x 56mm x 21mm |
| Weight | 160g |
| Customizable Features | RGB Logo Lighting |
The FiiO K11 is powered by a GD32F303RET6 microcontroller and utilizes the Cirrus Logic C543198 DAC chip. It supports high-resolution audio formats up to 384kHz/32bit PCM and DSD256. The device connects via USB Type-C and includes a custom VA display for easy access to essential information.
In terms of specifications, the K11 measures 147x133x32.3mm and weighs approximately 407g. It requires a DC12V 2A external adapter for power. Its single-ended (SE) power output is 520mW + 520mW at 32Ω, and 60mW + 60mW at 300Ω with a THD+N < 1%. The balanced (BAL) power output is 1400mW + 1400mW at 32Ω, and 250mW + 250mW at 300Ω, with a THD+N < 1%. The frequency response ranges from 20Hz to 50kHz with an attenuation of less than 0.2 dB.
The signal-to-noise ratio (SNR) is 123dB (A-weighted), and the noise floor is 2.8µV (A-weighted) for the single-ended output and 4.9µV (A-weighted) for the balanced output. The output impedance is less than 1.20 for 32Ω load in single-ended mode and less than 2.49 in balanced mode. Total harmonic distortion plus noise (THD+N) is less than 0.00035% at 1kHz with a 10kΩ load.
Overview
The FiiO K11 is a remarkable DAC/amp that offers high-performance audio at an accessible price, typically around $129 (Buy Now at $129). Designed to cater to both casual listeners and audiophiles, the K11 features a strong metal build, versatile connectivity options, and a powerful output. It includes inputs for USB-C, optical, and coaxial connections, as well as line outputs, enhancing its adaptability within various audio setups. The K11’s specifications include support for high-resolution audio formats up to 384kHz/32bit PCM and DSD256, ensuring a detailed and transparent sound profile. It offers three gain levels for customization and features a customizable RGB logo.
Sound testing reveals that the K11 delivers clean, neutral audio, though some users might find it’s note weight and sub-bass extension lacking. Compared to competitors like the SMSL M300SE, the K11 provides higher power output and more versatility, making it a valuable choice for users seeking a powerful and flexible DAC/amp. Overall, the FiiO K11 stands out for its impressive performance, solid build quality, and great value, making it a compelling option in its price range
Packaging and Building Quality
The K11 comes in a well-protected and thoughtfully designed package. Inside, you’ll find the K11 itself, a power supply unit, and a USB Type-C cable. The packaging is designed to protect the K11 during shipping, minimizing the risk of damage. The included power supply unit is a notable feature, as many DAC/amps in this price range lack a dedicated power source.
In terms of build quality, the K11 feels solid and well-constructed. It is housed in a metal chassis that imparts a premium feel, and its dimensions of 147x133x32.3mm with a weight of around 407g make it suitable for desktop use without occupying excessive space. The front panel features a large multifunctional rotary knob for volume and device settings, and it includes a 6.3mm single-ended output and a 4.4mm balanced output. The rear panel offers USB-C, optical, coaxial inputs, and RCA line output, ensuring versatile connectivity.
The K11 also features an RGB logo on top, which can be customized through the settings, adding a personal touch. The rubber feet on the bottom prevent the unit from sliding around on your desk, providing stability during use.
Features
The FiiO K11 offers a range of features that enhance its functionality and user experience. It includes three gain levels—low, mid, and high—allowing users to adjust the output to match different headphones and listening environments. The customizable RGB lighting on the logo can be adjusted or turned off to suit personal preferences. The device also supports firmware updates, ensuring compatibility with new technologies and standards. Additionally, the K11 features a line output (RCA) that functions as a preamplifier, making it versatile for use with active speakers or other audio equipment.
Sound Impression
The FiiO K11 is engineered to deliver a neutral and transparent sound profile. Its design aims to reproduce audio as accurately as possible without emphasizing or attenuating any particular frequency. This neutrality allows for an honest representation of the audio source, which is beneficial for critical listening and mixing.
Listening Impressions
Testing the K11 with various headphones, including the Aune AR5000, 7Hz Legato, and Hifiman Sundara, provided insights into its performance:
With the Aune AR5000, the K11’s low gain setting drives the headphones effectively, while the mid gain setting enhances dynamics and bass control. The bass is punchy and tight, though the sub-bass extension could be better. The mids are full and engaging, but note weight is slightly lacking. The soundstage benefits from the K11’s tuning, becoming more immersive. Overall, the pairing with the AR5000 is strong, though the note weight could be improved.
Using the K11 with the 7Hz Legato provides ample power, with the K11’s tuning taming the Legato’s bass, resulting in faster decay and a punchier mid-bass. The mids become more forward, addressing the Legato’s recessive quality. The soundstage improves in height, depth, and width, enhancing the overall perception. The K11’s power and transparency are beneficial, although the bass may be less pronounced.
For the Hifiman Sundara, the K11’s power output is sufficient but can introduce a slight brightness due to the thin note weight. The bass is fast and tight, with good control but somewhat lacking in impact. The mids are affected by the thin note weight, making them feel less engaging. The soundstage is well-maintained, but the brightness may impact overall balance. The K11 drives the Sundara effectively, though it may not be the ideal match for those seeking a warmer sound.
Line Out Sound Impression
When using the K11’s line out (RCA) connected to the Earmen CH-AMP, the K11’s DAC section provides a transparent and neutral sound. This pairing improves dynamics and adds more body to the mids, resulting in a balanced and detailed sound. The combination of the K11 and CH-AMP offers a solid balance of transparency and detail, making it a reliable choice for setups involving external amplifiers.
Comparison
When evaluating the FiiO K11 DAC/amp, it is helpful to compare it with other popular models in its category to understand its strengths and weaknesses. Here’s a detailed comparison with the SMSL M300SE, xDuoo TA-01B, and xDuoo XD05 Plus.
Comparison with SMSL M300SE
The SMSL M300SE, priced slightly higher than the FiiO K11, offers a different auditory experience with its warmer, more musical sound signature. This model emphasizes a fuller midrange, which provides a richer overall sound. However, in terms of power output, the K11 outperforms the M300SE significantly. The K11 delivers 1.4 watts on balanced output, compared to the M300SE’s 148 milliwatts. This substantial difference in power output means that the K11 is better suited for driving high-impedance headphones and delivering a more dynamic listening experience.
Additionally, the K11 separates its DAC and amp functions, potentially resulting in better performance and versatility. If you prioritize a neutral and powerful sound, the K11 is a superior choice. On the other hand, if you favor a warmer sound with pronounced mids, the M300SE might be more appealing.
Comparison with xDuoo TA-01B
The xDuoo TA-01B stands out with its hybrid tube design, which introduces a lush, warm sound signature. This contrasts with the K11’s neutral and detailed presentation. The tube design of the TA-01B provides a distinct auditory character that many audiophiles appreciate for its smooth, vintage-like warmth. In terms of power, the K11 has a notable advantage, with its higher output making it suitable for more demanding headphones. The TA-01B’s aesthetic appeal and unique sound profile might be attractive if you prefer a more colored, tube-driven sound. Conversely, for those who value neutrality and power, the K11’s performance is more advantageous.
Comparison with xDuoo XD05 Plus
The xDuoo XD05 Plus is a portable DAC/amp with a built-in battery and multiple input options, which enhances its versatility for on-the-go use. This model is known for its warmer sound with added coloration, providing a different listening experience compared to the K11’s neutral profile. While the XD05 Plus excels in portability, the K11 offers superior power output and is better suited for stationary setups where maximum power and sound neutrality are prioritized. If portability and convenience are crucial for your needs, the XD05 Plus is a strong contender. However, if you seek a more stationary setup focused on delivering high power and a neutral sound, the K11 is the better option.
In summary, the FiiO K11 DAC/amp distinguishes itself with its powerful output, neutrality, and robust build quality. While the SMSL M300SE provides a warmer sound with pronounced mids, the K11’s higher power output and neutral profile make it a more versatile choice for various headphones. The xDuoo TA-01B offers a unique tube-driven warmth and aesthetic, but the K11’s superior power output may appeal more to those with high-impedance headphones. The xDuoo XD05 Plus, while portable and versatile, does not match the K11’s power and neutrality. Ultimately, your decision should be based on your preference for sound signature, power requirements, and whether you value portability or a stationary setup.
User Feedback
Users have generally given positive feedback on the FiiO K11, appreciating its high price-to-performance ratio. It is praised for its transparent and neutral sound, sturdy build, and ample power output. The customizable RGB lighting and upgradeable firmware are also well-received.
However, some users note that the K11’s note weight is slightly thin, which can affect the overall fullness of the sound. Additionally, the slight brightness introduced by the K11 may not be ideal for all headphones or listening preferences. The lack of a line input might be a drawback for those seeking more versatile connectivity.
Pros and Cons
Pros:
- High Power Output: The K11 delivers 1.4 watts of power on balanced output, which is significantly higher than many competitors like the SMSL M300SE (148 milliwatts). This makes the K11 suitable for driving high-impedance and demanding headphones effectively.
- Neutral Sound Profile: The K11 is known for its neutral and transparent sound signature. It does not color the sound, providing an accurate representation of the audio source, which is ideal for critical listening and high-fidelity audio reproduction.
- Separation of DAC and Amplifier Functions: The K11 separates its DAC and amplifier functions, which can potentially offer better performance and reduce interference between the two components. This separation often results in improved overall sound quality.
- Build Quality and Design: The K11 features a robust build and well-engineered design, contributing to its durability and performance. Its design is typically professional and sleek, fitting well into a high-end audio setup.
- Versatility in Setup: With its powerful output, the K11 is versatile in handling a wide range of headphones, from low to high impedance, making it a flexible choice for various listening preferences.
Cons:
- Higher Price Point: The K11 is priced higher than some alternatives like the xDuoo XD05 Plus, which might be a consideration for budget-conscious buyers. Its price reflects its high-power output and performance but may be more than what some users require.
- Neutral Sound Might Not Suit Everyone: While neutrality is a pro for many audiophiles, some listeners might prefer a warmer or more colored sound signature, which other models like the SMSL M300SE or xDuoo TA-01B provide.
- Lack of Portability: Unlike the xDuoo XD05 Plus, which is designed for portability with a built-in battery, the K11 is more suited for a stationary setup. This may limit its appeal for users who need a DAC/amp for on-the-go use.
- Complexity for Casual Users: The separation of DAC and amp functions, while beneficial for performance, might be more complex for casual users who prefer an all-in-one solution. Users seeking simplicity might find the K11’s setup and operation less straightforward.
- Limited Features Compared to Some Competitors: While the K11 excels in power and neutrality, it may lack some additional features offered by other models, such as multiple input options or portable functionality, which might be important depending on user needs.
Conclusion
In conclusion, the FiiO K11 DAC/amp stands as a compelling choice for audiophiles seeking a versatile and high-performance audio solution. Its combination of robust features and solid build quality positions it as a standout product in its price range. The FiiO K11’s ability to handle high-resolution audio formats, including PCM up to 384kHz/32bit and DSD256, ensures that it delivers exceptional sound clarity and detail. This capability, paired with its powerful output of 1.5 watts into a 32Ω load, allows it to drive a wide range of headphones, making it a flexible option for various listening preferences.
The device’s build, crafted from metal, not only enhances durability but also contributes to its aesthetic appeal. The inclusion of multiple input options—USB-C, Optical, and Coaxial—adds to its versatility, enabling users to connect various audio sources effortlessly. The customizable RGB logo lighting adds a touch of personalization, making the FiiO K11 a visually appealing addition to any audio setup.
With its low total harmonic distortion of less than 0.001% and a signal-to-noise ratio of 118dB, the K11 ensures that audio reproduction is clean and faithful to the original recording. The frequency response range of 20Hz to 80kHz further guarantees that both the deepest lows and the highest highs are reproduced accurately.
Overall, the FiiO K11 DAC/amp delivers a balanced blend of power, precision, and flexibility. Its thoughtful design and comprehensive feature set make it an excellent investment for those who seek to enhance their listening experience, whether for casual listening or critical audio analysis.