Nobsound U5 Mini Fully Balanced Headphone Amplifier with XLR/4.4mm Compatible, Portable and Interchangeable Op-Amp Design

Innovative Sound Quality with Fully Balanced Circuitry": The unique fully balanced amplifier design enables 24V high-voltage operation with a DC 5V input. The wide frequency response (20-30kHz) and low distortion (0.005% THD) faithfully reproduce the subtle nuances of the original sound. For example, it precisely resolves the vibrato of classical string instruments and the texture of jazz basslines. It is compatible with a wide range of headphones, from the high-impedance (600Ω) ATH-R70x to the low-impedance (18Ω) IER-M9, ensuring stable operation in both home audio systems and portable setups. "Designed for Diverse Headphones": The high output power of 1400mW into a 32Ω load delivers impressive dynamic range and fast transient response, even with challenging headphones like the Aude*ze LCD-2 with planar drivers. The volume knob eliminates gradual channel imbalance, allowing for precise volume adjustment. In particular, it reproduces the explosive bass of electronic music and orchestral crescendos without distortion, effectively reducing fatigue during extended listening sessions or gameplay. "Purity of Analog Sound": The board uses a JRC4580 classic op-amp to deliver uncolored sound characteristics. The op-amp socket design allows for replacement with NE5532 or MUSES8820 op-amps, making it easy to customize the sound quality to suit your preferences. For example, if you want to bring vocals to the forefront, you can replace it with a mid-frequency-emphasizing op-amp; optimizing for genres ranging from rock to classical is possible. A high noise margin of SNR ≥ 110dB ensures background quiet even during late-night low-volume playback. "Combining Portability and Practicality": Despite its palm-sized size (68 x 69 x 28mm / weight 149g), it features a professional-grade interface. With a 4.4mm balanced jack and XLR output as standard, it's ideal for building mobile systems in combination with high-resolution audio players such as the NW-WM1ZM2 or M17. It's ready to use right out of the box with the included USB-DC cable and power adapter. It can be placed anywhere, whether in your bag on the way to work or on a cafe table, making it easy to create a high-quality music environment.

"Reliability and Expandability": The aluminum alloy housing provides excellent heat dissipation and durability, suppressing temperature rise even during a 10-hour continuous operation test. Input overvoltage protection (5V or more prohibited) reduces the risk of malfunction due to incorrect connections. In music production, pair it with monitor headphones such as the DT1990 Pro to clearly monitor DAW output. It also has the flexibility to be connected before an integrated amplifier, allowing for future system expansion.