SD Amplifiers are the newest creation from the engineering gurus at Phoenix Gold. These amplifiers are ultra compact, so they can be mounted just about anywhere. But don't be fooled by their small size as these amplifiers deliver serious power output. The PG gurus have created a full-range Class D topology that seamlessly delivers outstanding sound quality that even the most sensitive of ears will enjoy. The Class D design is also ultra efficient. This means lower operating temperatures and less strain on the vehicle's electrical system. The SD amplifiers are the perfect balance of power, size and affordability.