Experience the ultimate authority in headphone amplification with the SMSL H400 MK2. Engineered to drive the most demanding planar magnetic and high-impedance dynamic headphones effortlessly, this fully balanced desktop amplifier delivers a staggering 18W of output power per channel at 16 ohms and 9W at 32 ohms. At the core of its uncompromising acoustic performance is a revolutionary architecture featuring our patented fully balanced 4-channel headset amplifier circuit, PLFC+, working in flawless harmony with an array of 14 high-end OPA1612A operational amplifiers. This relentless pursuit of analog perfection yields a breathtakingly low distortion rate (THD+N) of just 0.00006% and an outstanding signal-to-noise ratio of 132dB, ensuring that every transient, dynamic swing, and microscopic micro-detail is rendered with visceral impact and absolute fidelity.

Mastering such immense power requires extraordinary control and structural purity. The H400 MK2 achieves a pitch-black sonic background with an exceptional 132dB Dynamic Range, made possible by a custom-built, high-power, low-noise Gallium Nitride (GaN) power supply. Volume regulation is managed by a high-precision electronic relay step controller, completely eliminating left-right channel imbalances for perfect tracking even at whispered levels. Whether you are listening through power-hungry over-ear flagships or highly sensitive In-Ear Monitors (IEMs), the specially optimized 3-gear gain control—with its low gain stage down to -5.5dB (balanced) and -11.5dB (unbalanced)—guarantees a completely hiss-free experience. Beyond its prowess as a world-class headphone amplifier, boasting comprehensive 4.4mm, 4-pin XLR, and 6.35mm outputs, its dedicated balanced XLR and RCA pre-out functions with an integrated grounding control switch (Floating/Grounded) allow it to serve as a Hi-End pre-amplifier for your active speakers, all encased in an ultra-compact desktop design with a fully laminated color IPS screen.