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Linearity Linearity is the extent to which the output waveform of an amplifier is a faithful reproduction of the input waveform In hi-fi equipment, all the amplifiers must be as linear as the state of the art allows If you connect a dual-trace oscilloscope (one that lets you observe two waveforms at the same time) to the input and output terminals of a hi-fi audio amplifier with good linearity, the output waveform is a vertically magnified duplicate of the input waveform When the input signal is applied to the horizontal scope input and the output signal is applied to the vertical scope input, the display is a straight line In an amplifier with poor linearity, the instantaneous output-versus-input function is not a straight line The output waveform is not a faithful reproduction of the input, and distortion occurs In some RF amplifiers this is all right In hi-fi audio systems, it is not Hi-fi amplifiers are designed to work with input signals up to a certain peak (maximum instantaneous) amplitude If the peak input exceeds this level, the amplifier becomes nonlinear, and distortion is inevitable In a hi-fi system equipped with VU or distortion meters, excessive input causes the needles to kick up into the red range of the scale during peaks Dynamic Range Dynamic range is a prime consideration in hi-fi recording and reproduction As the dynamic range increases, the sound quality improves for music or programming having a wide range of volume levels Dynamic range is expressed in decibels (dB) At low volume levels, the limiting factor in dynamic range is the background noise in the system In an analog system, most of this noise comes from the audio amplification stages In tape recording, there is also some tape hiss A scheme called Dolby (a trademark of Dolby Laboratories) is used in professional recording studios, and also in high-end consumer tape equipment, to minimize this hiss Digital recording systems produce less internal noise than analog systems At high volume levels, the power-handling capability of an audio amplifier limits the dynamic range If all other factors are equal, a 100-W audio system can be expected to have greater dynamic range than a 50-W system The speaker size is also important As speakers get physically larger, their ability to handle high power improves, resulting in increased dynamic range This is why serious audio enthusiasts sometimes purchase sound systems with amplifiers and speakers that seem unnecessarily large.

Figure 8-1

There are myriad ways to set up a hi-fi system A true audiophile ( sound lover ) assembles a complex system over a period of time Here are some basic considerations that can serve as guidelines when choosing system components

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Configurations The simplest type of home stereo system is contained in a single box, with an AM/FM radio receiver and a compact disk (CD) player The speakers are generally external, but the connecting cables are short The assets of a so-called compact hi-fi system are small size and low cost

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Figure 8-2