Fully balanced, super efficient The TOPPING PA5 is a fully balanced Class D power amplifier-an affordable and efficient option for powering your bookshelf or floor stand speakers. As a balanced amplifier, it powers each incoming channel with a separate amplifier chip. As a Class D amp, it uses far less power than Class A amps, making it super efficient. Fully-balanced Class D amplification The newly developed Class-D amplification circuit uses multiple novel optimization techniques to fully push