All Macintoshes are equipped with an internal speaker and a dedicated sound clip, and they are capable of audio output without additional hardware and/or software. To take advantage of built-in stereo sound, external speaker are required.
An amplifier is an electronic device that increases the power of a signal. Amplifiers are used in audio equipments. They are also called power amplifiers. Speakers with built-in amplifiers or attached to an external amplifier have become an integral part of the computers today and are important for any multimedia presentation presented to a large audience or in a noisy setting.