Using MOS-FET power devices, the Class D amplifier circuitry is able to deliver incredible performance in compact dimensions. In a digital amplifier a Pulse-Width Modulator (PWM) expresses a low-frequency audio signal as a wide pulse, and a high-frequency audio signal as a narrow pulse. This then undergoes digital-to-analogue conversion for output, which is the basis of any digitally recorded media hence excellent affinity to digital sources. High power conversion efficiency means less power wasted and less heat generated, therefore an absence of bulky heat sinks.