Modern amplifiers exist in all shapes and sizes. As such it may be tricky to discover the actual functioning of the amplifier only by taking a look at the specs. Throughout this test you ideally wish to install the amplifier in a similar setting as your application. If you own a small space then you dont need much more than a few watts. If you want to install speakers outdoors or in a concert then you will require several hundred watts of power. Power is either given as “Watts peak” which means the amp can create short bursts of this amount of power or “Watts rms” which describes how much wattage the amp can provide for a longer amount of time. The peak specification has been to some extent misused by manufacturers stating excessive peak audio wattage whilst their mini amps are actually developed with very small power supplies unable to handle more than only several watts rms power. Today many amplifiers are going to denote rms power that provides a better indication of the amp’s real performance. The main reason is that audio signals will have short peaks of high power which the amplifier has to handle. Rms power is measured with a uniform sine wave that hardly compares with a music signal in terms of the power envelope.
An audio amplifier that has a set internal supply voltage is going to have a maximum output voltage swing which is restricted by that supply voltage. Therefore frequently maximum output power is given for a specific loudspeaker impedance.Learning The Wattage Spec Of Mini Amplifiers by Carlos Danger