The Luxsin X9 is an excellent desktop DAC & headphone amplifier that works great as a preamplifier. The X9 is equipped with an extensive range of connectivity options, including HDMI ARC, optical, coaxial, analog inputs, USB-B/USB-C, 12V trigger ports, and dual subwoofer outputs. This allows for seamless integration into various audio setups, providing flexibility for both home and professional audio environments. As a reference-grade DAC, headphone amplifier, and preamplifier, the X9 delivers exceptional signal control and dynamic audio performance, setting a new standard in desktop audio. Designed to meet the exacting standards of audiophiles and high-fidelity sound enthusiasts, Luxsin X9 seamlessly blends powerful hardware with a sleek, functional design to deliver pure and captivating sound. Innovative in-house developed features provide a uniquely immersive listening experience, while the intuitive software system ensures effortless and efficient operation. A Headphone amplifier with DAC AK4499EX + AK4191EQ. Come with 4'' touch screen, VU meter and the panel is tilted forward at 15° for easy operation. Auto EQ: automatically adjust EQ gain to make it close to the Harman curve, over 2500+ headphone models are included in the database. 6.35mm and 4.4mm headphone jack supports automatic impedance detection. Support Cross feed, Stereo Width, DSP, R2R volume control, 0.1 dB volume step and more ... Mobile control, web control, OTA firmware update.