active loudspeaker crossover filters (1)

Few things can so hold the attention of the serious audiophile as do loudspeakers. This applies with particular strength to those whose fingers always have the experimenter`s itch - so that they cannot or will not without reserve accept somebody else`s idea of a loudspeaker system. This can lead to the expenditure of considerable sums, if only on wooden panels, and it will sometimes also lead to frayed tempers at home ... One of the ways of sinking cash into an existing system is to replace the `passive` separating (`crossover`) filters by `active` types. This of course involves the provision of a separate power amplifier for every driver in the system. This article on Active Crossover Filters (ACF`s) will describe a universal filter circuit, capable of producing a vast number of filter characteristics.