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Most hi-fi systems are more than just the basics. Features such as balance control, tone control, and graphic equalizers are common. Audio mixers are sometimes
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592 Acoustics, audio, and high fidelity seen in home entertainment systems, especially those used by children and young adults who have visions of becoming popular-music icons.
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In hi-fi stereo sound equipment, the balance control allows adjustment of the relative volumes of the left and right channels. In simple hi-fi receivers, tape players, and amplifiers, the balance control consists of a single knob (Fig. 31-5A). This knob is connected to a pair of potentiometers. When the knob is rotated counterclockwise, the left-channel volume increases and the right-channel
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31-5 Methods of balance control. At A, a single control. At B, separate volume controls. At C, separate volume controls and graphic equalizers.
Other components 593 volume decreases. When the knob is rotated clockwise, the right-channel volume increases and the left-channel volume decreases. In sophisticated sound systems, the balance is adjusted via two volume controls, one for the left channel and the other for the right channel. The most advanced sound systems make use of independent volume controls and graphic equalizers for the two channels. Figures 31-5B and 31-5C are functional block diagrams showing the general circuits for these methods of balance control. Proper balance is important for faithful stereo sound reproduction. A balance control can compensate for such factors as variations in speaker placement, relative loudness in the channels, and the acoustics of the room in which the hi-fi equipment is installed. Adjustment of the balance control(s) can sometimes be aided by the use of a VU meter in each channel. However, the best overall results are often obtained by simply adjusting the balance control(s) until the system produces the most pleasing sound.
Tone control
The amplitude-versus-frequency characteristics of a high-fidelity sound system are adjusted by means of a tone control or controls. There are various types of tone controls; some are extremely simple whereas others are sophisticated. In its simplest form, a tone control consists of a single knob or slide device. The counterclockwise, lower, or left-hand settings of this control result in strong bass (lowfrequency) and weak treble (high-frequency) audio output. The clockwise, upper, or right-hand settings result in weak bass and strong treble. When the control is set to midposition, the audio response of the amplifier is more or less flat; that is, the bass, midrange, and treble are in roughly the same proportions as in the recorded or received signal. Figure 31-6A is a simple example of how a single-knob tone control might be incorporated into the output of an audio amplifier. The amplifier itself is designed such that the treble output is exaggerated. The potentiometer attenuates the treble to a variable extent, so when the tone control is at midposition, the frequency-versus-amplitude audio output curve is relatively flat. A somewhat more versatile tone control has two capacitors and two potentiometers, as shown in Fig. 31-6B. One combination is in series, and the other is in parallel. The series-connected resistance-capacitance (RC) circuit is connected in parallel with the audio output; this control attenuates the treble to a variable extent. The parallel RC circuit is in series with the audio path; it attenuates the bass to a variable extent. The two potentiometers can be adjusted separately, although there is some interaction between their effects. The most sophisticated type of tone control allows independent adjustment of several different frequency ranges within the range of human hearing. This device, the graphic equalizer, has several slide potentiometers. By moving these controls to various positions, many different audio response curves can be obtained.
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