Technics' proprietary MOS Class AA output stage. MOS refers to Technics variant on MOSFET devices, and Class AA is designed to emulate the benefits of Class A operation, namely elimination of zero cross distortion, without the cost and complexity of true Class A operation, which would have put up the price of the amplifier several times over.
No es, pero casi.

Yo tengo el SU-A700 mkIII y mueve de maravilla mis B&W CM4 con el volumen a 1/4 de recorrido (cuando las compre me dijeron que con ese ampli ni de coña y va para 4 años)