SMSL PA400 Stereo / Mono Amplifier

The SMSL PA400 is an innovative amplifier that uses Gallium Nitride (GaN) transistors to deliver 2x250W amplification at 4Ω. Its versatility also allows it to operate in pure mono mode, delivering an impressive 500W at 8Ω. Each component of the PA400 has been meticulously selected to achieve exceptional audio performance, with an incredibly low harmonic distortion rate of 0.0003% and a signal-to-noise ratio of 115dB.

SMSL PA400: GaN transistors amplification

The PA400 uses GaN FET transistors for its amplification stage. These transistors offer significantly higher efficiency than traditional silicon transistors, minimising energy losses during switching and thus reducing heat generation. In addition, GaN transistors are distinguished by their extremely high switching speed, in the order of 1MHz. This increased speed has several notable advantages: it eliminates switching noise in the circuits, significantly reducing background noise, and it allows for much faster response times, instantly adapting to variations in power demand for greatly improved audio dynamics.