ABSTRACT
A group of electronic components joined into a single package. It is distinguished from a discrete circuit, which consists of individually packaged elements.
In an audio system, the strength of a sound signal; it is measured in dynes or Newtons,or in watts per square meter. The intensity of a sound depends first of all on the amplitude of its vibrations. This value is affected by various factors and components, especially the amplifier. For high-fidelity reproduction, peak levels reach 20 dynes per square centimeter (100 dBs)—above the threshold of hearing. What the listener finally perceives to be the relative intensity of the reproduced signal is referred to as loudness. Loudness is a physiological impression of the level of the sound; it has no quantitative measurement.
