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Consumer Electronics by S. P. Bali

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TYPES OF EQUALISERS

Whatever equalisers are used, they may be one of two major types—active or passive. The latter are the simplest, but inserting them in a circuit involves a loss of gain. Only at a maximum boost point will the overall gain approach the level of transmission in the absence of the equaliser. This means that additional amplification is needed whenever passive-type equalisers are used, so that normal level is maintained. A 20 dB line amplifier is useful for this purpose and consoles with many equalisers usually have an equal number of patchable line amplifiers so the level can be maintained.

Mistakes can be avoided by including a line amplifier with each equaliser, so it is automatically included when the equaliser is patched in. ...

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