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There are basically three types of equalizers: graphic, parametric, and a hybrid of these two, often referred to as paragraphic. Additionally, there are passive equalizers, which have no gain, active gain pre-amps, which have a again stage usually with a volume control, and booster equalizers which we won’t consider here since they are inferior passive equalizers with inexpensive IC amplifier built-in. As in state-of-the-art home audio systems the optimum system requires a dedicated pre-amp with