Design of The Active Driver
In a loudspeaker system incorporating passive diaphragms, the term 'active driver' refers to the loudspeaker driver with the voice coil, to distinguish it from the 'passive' diaphragms which have no voice coil. In loudspeaker systems that rely on resonant augmentation of the output of the active driver (these include bass-reflex systems, passive radiator systems, bandpass systems, and transmission-line systems), the resonant system absorbs the acoustic load from the active loudspeaker driver, decreasing the necessary cone excursion to achieve high output at low frequencies. However, it is advantageous to have a loudspeaker driver with a strong magnetic structure for high electrical damping of the driver cone. This supplies the maximum possible force to the loudspeaker cone and creates the maximum possible excitation of the resonant system.
The same is true for systems that use wOOx technology, in which the wOOx radiator absorbs the acoustic load from the active driver. Because the wOOx radiator is capable of greater excursion than the active driver without increasing distortion, it is desirable to excite the wOOx radiator as much as possible, to keep the excursion of the active driver at a minimum while maximizing the output of the loudspeaker system. Thus it is desirable to employ a more powerful magnetic structure. To protect the moving structure of the active driver from potential overexcursion, the driver is designed with a higher degree of mechanical excursion capability.
Read more about this topic: WOOx Technology
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