PA System The least expensive of the PA systems – PA systems with 30 Watts of power or less – provide a wide range of highly functional solutions to the problems of sound reinforcement. Because they are relatively easy to manufacture, this segment of the market is not only highly competitive, but also quite diverse. For example equipment ranging from a 2 Watt waistband amplifier with a headband microphone to a 30 Watt sound system featuring speaker stands and a handheld mic are considered Mini PA systems. Like all PA systems, the Mini PA includes an amplifier, a speaker and a microphone. Mini PA systems are highly portable and though less powerful than full size PA systems also come in feature rich models.