The Sansui AU-X 1111 Mos is an integrated amplifier that was part of Sansui's vintage series released in the early 1980s. It utilizes MOSFET technology for its output stage, which enhances sound quality and provides a smooth, warm audio reproduction. The amplifier features a robust build quality and is equipped with various inputs for both phono and line sources. Its power output is rated at approximately 100 watts per channel at 8 ohms, which makes it capable of driving a wide range of speakers. Additionally, it has a useful set of controls, including tone controls and balance adjustments, allowing for a customized listening experience.