HPA-450/02 2 Channels Digital Audio Power Amplifier use energy-efficient Class D amplifier technology and switching mode power supply technology. In general, the Digital Audio Power Amplifier efficiency is over 80%, making it energy-saving and environmentally friendly. In addition, the power amplifier has amplifier gain optional and various protection mechanisms, such as clipping limiter, amplifier output DC protection, short circuit protection, temperature power control and over temperature protection, power supply under voltage protection, etc., to protect the audio equipment from damage.