LOXJIE D40 Pro Hi-Fi Headphone Amplifier and DAC review with MQA decoding

Description

Design and Build Quality: Aesthetic Yet Functional

The LOXJIE D40 Pro Hi-Res USB Audio DAC caught my eye right out of the box. Its sleek, minimalist design combines a sturdy aluminum chassis with an intuitive button layout, making it a great addition to any desk or audio setup. At 3.64 pounds, it feels substantial without being cumbersome. I particularly appreciated the remote control, which offers convenience for adjusting settings without needing to be physically close to the device. The compact dimensions (14 x 9.5 x 3.2 inches) make it easy to integrate into small spaces, proving that high-performance audio gear doesn’t need to dominate your room.

Key Benefits:

• Elegant and durable aluminum build.
• Compact size, fitting seamlessly into tight spaces.
• Convenient remote control for effortless adjustments.

Performance: Audiophile-Grade Precision

Testing this headphone amplifier was an absolute treat for my ears. The ESS ES9039 MS Pro chip truly delivers on its promise of 32-bit high-fidelity audio, with a THD+N as low as -125dB for near-zero distortion. Whether it was bass-heavy tracks or delicate classical pieces, every sound was crystal-clear and immersive. The MQA full decoding impressed me as it allowed for studio-quality playback, while the DSD512 support turned even older tracks into a vibrant listening experience.

I also explored its two adjustable gain levels (high and low), which are ideal for pairing with a variety of headphones. Using high gain, the +20dB boost on the balanced interface made my higher-impedance headphones shine. Meanwhile, the independent volume control proved invaluable—I could tweak the levels for headphones and line outputs separately, ensuring no accidental ear-splitting surprises.

Good Points:

• Exceptional sound clarity, even at high volumes.
• Two adjustable gain levels for versatile headphone compatibility.
• MQA and DSD512 support, delivering studio-like audio.

Connectivity Options: Versatility At Its Best

One of the standout features of this device is its wide range of inputs. The USB, Optical, Coaxial, I²S, Bluetooth, and AES/EBU inputs make it compatible with nearly any audio source you can think of. I tested it with my PC via USB, my TV through the Optical input, and even paired it with my phone using Bluetooth. Each connection was seamless, and the sound quality remained consistently high across all inputs.

The I²S setting menu added another layer of flexibility, allowing me to choose between two different interface modes to match my signal source. This customization ensures that the device adapts to your setup, not the other way around.

Drawbacks:

• Bluetooth codec options could be more extensive for audiophiles.
• No included cables for certain inputs like I²S, which might require additional purchases.

Usability and Features: Designed for Control

One feature I didn’t realize I needed until I used it was the independent volume function. It’s such a small detail but immensely helpful. I loved being able to fine-tune the sound levels for my headphones without worrying about the line output settings. Another plus was the output impedance being close to 0Ω, which ensured minimal signal loss and maximum audio fidelity.

What stood out most was the adjustable gain levels. The ability to switch between high and low gains meant I could use a wide variety of headphones and still get optimal sound. This adaptability is a huge win for anyone who owns multiple pairs of headphones or simply values versatility.

Areas for Improvement:

• Lack of an on-screen display for more intuitive control.
• Learning curve for less tech-savvy users, especially with advanced settings like I²S.

Competing Products

Comparing the LOXJIE D40 Pro to other headphone amplifiers I’ve tested, it definitely holds its own. The Topping DX7 Pro, for instance, offers a similar level of audio fidelity but lacks the comprehensive input options this device provides. On the other hand, the FiiO K9 Pro excels in Bluetooth codec support but doesn’t quite match the D40 Pro in terms of gain adjustment versatility.

Where the D40 Pro truly shines is in its balanced outputs and MQA decoding, which are often found in much pricier alternatives. While it may not have all the bells and whistles of some ultra-premium models, it achieves a remarkable balance between performance and practicality.

Price Performance

In terms of value for money, this product sits comfortably in the sweet spot. Its combination of high-fidelity performance, versatile connectivity, and solid build quality justifies the investment. Sure, there are cheaper options on the market, but few offer the same blend of audiophile-grade features and everyday usability.

If you’re someone who values immaculate sound clarity, the D40 Pro delivers without breaking the bank. It’s not the cheapest option, but for what you’re getting—low distortion, MQA decoding, and wide compatibility—it’s absolutely worth considering.

Final Thoughts? Nope, because I know you’re already thinking about how this fits into your setup.

Additional information