Loudspeakers typically contain several different driver units in order to reproduce all sounds accurately. That creates major problems because the alternating current entering the loudspeaker must be split into frequency bands that get directed to bass, midrange and tweeter drivers, or just two drivers in cheaper models. A crossover, usually hidden inside a loudspeaker box, performs this obviously major task, diverting and passing all the alternating current generated in the amplifier. The common element of the crossover is a coiled wire winding. The wire used is plane solid copper and relatively thin, about 1mm diameter inside very good loudspeakers. It is not very apparent to most audiophiles that electric current carrying sound information from the power amplifier must pass through up to 100 meters (yards) or more of plain thin copper wire, coiled and packed inside loudspeaker, before it reaches the 'speaker driver! Such a long wire also heats up considerably from the current passing through - a good porton of amplifier power is wasted in heating these wires, and that's not what it was originally intended for. Even more concerning is that the waste of power is uneven, following music dynamics and in effect is compressing the sound. The thought that springs to mind is: if replacing relatively short length of one kind of carefuly designed loudspeaker cable (wire) for another (also carefully designed cable) can produce dramatic sound improvements, what improvement would produce complete elimination of tenfold longer length of plain solid core wire found inside conventional loudspeakers? (yes, it produces a major improvement)
Foundation #4: Coiled windings must not be used in loudspeaker crossovers, in order to minimize use of wire in signal path, its sound degradation effects and power wastage.
TWO EXAMPLES OF TYPICAL WELL MADE PASSIVE CROSSOVERS.
NOTE THE COILS MADE FROM SOLID CORE WIRE. CURRENT GENERATED BY POWER AMPLIFIER MUST PASS THROUGH CROSSOVER ELEMENTS BEFORE IT CAN REACH LOUDSPEAKER DRIVERS, CAUSING COMPRESSION, LOSS OF POWER AND SOUND DEGRADATION.
DanA ACTIVE CROSSOVERS OVERCOME THESE PROBLEMS.