The FiiO K5 Pro ESS marks an exciting update to FiiO’s lineup of desktop DACs and amplifiers. Priced at approximately USD 209, the K5 device is designed to cater to audiophiles and casual listeners alike. With its robust feature set, high-quality components, and modern design, this all-in-one device promises to elevate your audio experience. In this review, we’ll delve into the design, performance, and features of the FiiO K5 Pro ESS to help you determine if it’s the right fit for your audio setup.
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The Tech Basic Verdict
The FiiO K5 Pro is a standout choice in the desktop DAC and amplifier market, offering excellent value for its price of approximately USD 209. It builds upon the strengths of its predecessor with the upgraded ESS9038Q2M DAC chip, which delivers enhanced performance, reduced distortion, and a more dynamic sound signature. The K5 Pro ESS’s robust build quality, featuring a solid aluminum chassis, ensures durability and a premium feel.
Its versatile design includes a wide range of connectivity options and adjustable gain settings, making it suitable for both in-ear monitors and high-impedance headphones. The unit’s balanced and neutral sound profile, combined with its powerful output, provides a satisfying listening experience across various audio sources.
While it faces competition from other high-performance units like the SMSL SU-6 & SH-6 stack and Topping DX3 Pro+, the K5 Pro stances out for its combination of power, build quality, and sound performance at a competitive price. Overall, the FiiO K5 Pro is an impressive all-in-one solution that offers both reliability and high-quality audio, making it a solid choice for audiophiles and casual listeners alike.
Pros:
- Highly Effective All-in-One Unit: Provides impressive functionality and performance in a single device.
- Well-balanced and Musical Sound: Delivers a harmonious and engaging audio experience.
- Powerful Headphone Amplifier: Capable of driving demanding headphones with ease.
- Excellent Value: Offers substantial features and performance for its price.
- Flexible Usage: Can serve as a line-level headphone amplifier as well.
- Adjustable Gain Settings: Includes three gain levels and maintains precise channel tracking.
- Quiet Operation: Features a noise-free background, making it ideal for in-ear monitors (IEMs).
- Improved Over Previous Model: Shows noticeable enhancements compared to its predecessor.
- Compact Design: Small and easy to fit into various setups.
Cons:
- Moderate Resolution: May not offer the highest level of detail compared to some competitors.
- Less Dynamic Amplifier: The headphone amplifier could benefit from more dynamic range.
- No MQA Support: Lacks MQA decoding, which might be a downside for those who use it.
- Inaccessible Internal Filters: Internal low-pass filters cannot be adjusted by users.
- Absence of Bluetooth: Does not feature Bluetooth connectivity.
- Incompatibility with FiiO App: Cannot be controlled through the FiiO control application.
- Active Pre-Out with Headphone Output: The pre-out remains active when the headphone output is in use.
- Power Adapter Quality: A higher-quality power adapter would be a desirable addition.
Technical Specifications
| Features | Specification |
| DAC Chip | ESS Technology ES9038Q2M |
| Amplifier | OPA 1642 + TPA6120 |
| USB Controller | XMOS XUF208 |
| Rate Sampling Support | PCM up to 32bit-384kHz, Native DSD256 |
| Power Output | 1.442W at 32 ohms |
| Gain Settings | High: 16.6Db |
| Impedance of Output | 1.2 ohms |
| Inputs and Outputs | RCA IN, RCA OUT, USB B IN, COAX, OPT, 6.3MM PO |
| Dimensions & Weight | Approx. 120 x 130 x 55 mm; 480 grams |
| Price | USD 209 |
Overview
Since its establishment in 2007, FiiO has become a leading name in the audiophile world, known for crafting premium audio gear that spans a wide range of budgets. The company has earned a loyal following among audio aficionados globally due to its focus on both innovation and quality. FiiO’s product range is extensive, covering everything from compact portable DACs to robust desktop amplifiers. The K5 Pro ESS exemplifies FiiO’s commitment to superior audio performance and versatility. This model showcases the company’s dedication to advancing the auditory experience by providing high-quality sound and multifunctionality, further solidifying FiiO’s reputation as a key player in the high-fidelity audio market.
Design and Build Quality
The FiiO K5 Pro ESS showcases a blend of durability and practical design, measuring approximately 120 x 130 x 55 mm and weighing around 480 grams. This medium-sized device is constructed from robust aluminum, which gives it a premium feel and ensures long-lasting durability. The K5 Pro ESS continues the design ethos of its predecessor with a nearly identical build, maintaining the high standards seen in earlier models. It integrates both a DAC and an amplifier in one unit, offering flexibility to users who may want to pair the amplifier with their own DAC or use the K5 Pro ESS as a standalone solution.
The device’s design is characterized by its functional features, including a prominent, centrally located volume wheel that doubles as the power switch. The surrounding LEDs add a touch of modernity to its industrial aesthetic. On the front panel, there are two lever switches for selecting inputs and adjusting gain levels, along with a 6.3mm headphone output.
On the rear, the K5 device is equipped with a variety of ports: optical input, coaxial input, RCA line-in, and RCA line-out, with a USB input and a 15V DC power socket on the far right. This extensive range of connectivity options enhances its versatility in different audio setups. All components, including sockets and levers, exhibit FiiO’s commitment to solid build quality. The sandblasted metallic finish and aluminum CNC chassis not only look attractive but also contribute to the unit’s robust and reliable construction. Overall, the K5 Pro ESS reflects FiiO’s consistent dedication to delivering well-crafted, high-performance audio equipment.
The build quality of the K5 device is top-notch, with solid and durable components that enhance its longevity. The CNC-machined aluminum chassis and sandblasted metallic finish give the device a refined look that is both aesthetically pleasing and functional.
Aesthetics
The K5 Pro ESS retains a similar aesthetic to its predecessor, the original K5 Pro, which was launched in August 2019. The new version does not feature a drastic redesign but maintains a thick, robust aluminum case that has become synonymous with FiiO’s build quality. The front panel includes a large, centered volume knob that also functions as a power switch. This practical design choice allows for easy operation and adds a touch of elegance to the device.
Surrounding the volume knob are two lever switches that allow users to toggle between input sources and adjust gain levels. On the right side of the panel is a 6.3mm headphone jack, while the rear panel is equipped with a variety of connectivity options, including coaxial, optical, RCA line-in, and RCA line-out ports. A USB input and a 15V DC power socket complete the array of options, providing flexibility and convenience.
Features and Technology
The FiiO K5 Pro is an all-in-one DAC and amplifier solution that integrates high-performance components to deliver exceptional audio quality. Here’s a closer look at the key features and technological advancements of the K5 Pro ESS:
DAC and Amplifier
The K5 device is loaded with the ESS Technology ES9038Q2M DAC chip, a significant upgrade from the AKM AK4493EQ used in the previous model. The ES9038Q2M is known for its superior performance, low distortion, and improved noise floor. This update aims to enhance the fidelity and overall audio quality of the device.
For amplification, the K5 Pro ESS utilizes the OPA 1642 and TPA6120 chips, which provide ample power and clean amplification for a variety of headphones. With a power output of 1.442W into a 32-ohm load, the K5 Pro ESS can drive most headphones with ease.
USB Controller and Sampling Rates
The K5 Pro ESS features the XUF208 XMOS USB controller, which supports PCM sampling rates up to 32-bit/768kHz and native DSD up to 512. The XMOS XUF208 is a reliable USB controller that enables firmware upgrades through USB and ensures compatibility with various operating systems.
The device also supports Android OTG and iOS CCK wired connections, allowing for versatile use with different mobile devices. The light ring around the volume knob indicates the active sample rate, providing a visual cue for the current audio resolution.
Power and Gain Settings
One of the notable features of the K5 device is its adjustable gain settings. The device offers three gain levels: Low (6dB), Medium (12dB), and High (16.6dB). This range of gain settings ensures that the K5 Pro ESS can accommodate both in-ear monitors and full-size headphones, providing optimal performance without distortion.
The K5 Pro ESS also boasts a low output impedance of 1.2 ohms, which minimizes interaction with the connected headphones and prevents unwanted colorations in the sound.
Performance Analysis
The FiiO K5 Pro ESS delivers impressive performance across various aspects of audio reproduction. Here’s a detailed look at its DAC and amplifier performance:
DAC Performance
When paired with monitors, the DAC section of the K5 Pro ESS offers a detailed and engaging sound signature. The low end is powerful, with a good punch and texture, while the midrange is clean and well-defined. The upper mids extend energetically, providing a coherent and balanced sound across the frequency spectrum.
The DAC’s soundstage is medium-sized, offering adequate depth and imaging. Instrument positioning is accurate, and the overall technical capability is satisfactory for the price. The DAC delivers a clean, articulate sound with no significant dips or peaks.
Amplifier Performance
The amplifier section of the K5 Pro ESS provides a balanced and neutral sound, complementing the DAC’s performance. The amplifier is capable of driving a wide range of headphones with ease, thanks to its ample power output and low noise floor. The K5 Pro ESS performs well when paired with other DACs or used as a standalone unit.
The amplifier section is particularly effective with high-impedance headphones, delivering clean power and maintaining good control over the audio signal. The noise floor is inaudible with most headphones, ensuring a quiet background for critical listening.
Overall Sound Quality
The K5 Pro ESS offers a well-rounded audio experience with both in-ear monitors and full-size headphones. The sound signature is neutral and linear, with a clean and natural presentation. The bass is impactful and well-tuned, while the midrange is transparent and articulate. The treble is detailed and extended, providing a vivid and controlled high-end.
The K5 Pro ESS excels in delivering a high level of detail and resolution, making it a versatile choice for various listening preferences. The device maintains a low noise floor and offers excellent dynamic range, ensuring a satisfying and immersive listening experience.
Comparisons with Competitors
To provide a comprehensive view of the FiiO K5 Pro ESS’s performance, let’s compare it with some of its competitors in the market:
FiiO K5 Pro ESS vs. SMSL SU-6 & SH-6 Stack ($289 USD)
The SMSL SU-6 & SH-6 stack is a high-performance budget stack that features the ESS9038Q2M DAC chip, similar to the K5 Pro ESS. The SMSL stack offers a more spacious soundstage and better imaging compared to the K5 Pro ESS. It also provides a larger headroom and better overall technical capability. However, the K5 Pro ESS has a slight advantage in power output, delivering 1.45W into a 32-ohm load compared to the SMSL stack’s 1.3W. The SMSL stack also includes wireless capabilities, which the K5 Pro ESS lacks.
FiiO K5 Pro ESS vs. Khadas Tone 2 Pro ($249 USD)
The Khadas Tone 2 Pro is another DAC and amplifier featuring the ESS9038Q2M chip. The K5 Pro ESS offers significantly more power, making it a better choice for high-impedance headphones. The Tone 2 Pro has a more linear and somewhat dry sound compared to the K5 Pro ESS, which provides a more dynamic and impactful bass. While the Tone 2 Pro is portable and can be powered via USB, the K5 device is better suited for stationary setups where more power is required.
FiiO K5 Pro ESS vs. Topping DX3 Pro+ ($199 USD)
The Topping DX3 Pro+ is an all-in-one device that also features the ESS9038Q2M DAC chip. The DX3 Pro+ stands out with its excellent sound quality, spacious soundstage, and slightly more energetic presentation. It provides 1.8W of power into a 32-ohm load, surpassing the K5 Pro ESS in power terms of the output. The DX3 Pro+ also includes wireless functionality, which the K5 Pro ESS lacks. The Topping unit’s 3.5mm headphone output contrasts with the K5 Pro ESS’s 6.3mm jack, offering a different user experience.
Conclusion
The FiiO K5 Pro is a well-crafted DAC for desktops and amplifiers that offers a high level of performance and versatility. Its robust build quality, high-quality components, and thoughtful design make it a compelling choice for audiophiles and casual listeners alike. With the upgraded ESS9038Q2M DAC chip, improved power output, and comprehensive connectivity options, the K5 Pro ESS delivers a satisfying and immersive audio experience.
While it faces strong competition from other products in the same price range, the K5 Pro ESS’s combination of power, flexibility, and sound quality makes it a standout option. Whether you’re using it as a standalone unit or integrating it into a more complex audio setup, the K5 Pro ESS provides a reliable and enjoyable listening experience.
For those seeking a versatile, high-performance DAC and amplifier that can handle a range of headphones and audio sources,
the FiiO K5 Pro ESS is certainly worth considering. Its solid build, impressive sound quality, and practical features make it a valuable addition to any audio enthusiast’s collection.