Active Equalization
One benefit of the wOOx bass radiator (and passive radiators in general) when compared to the more common bass-reflex vents is that there is no possibility of air turbulence noise if the resonant system is greatly excited. As a result, additional equalization applied near the enclosure's tuning frequency can increase system output without generating extraneous noises or greatly increasing cone excursion of the active driver. Many wOOx-equipped mini-stereo systems produced by Philips feature a three-level equalization control which applies additional bass equalization at frequencies which excite the wOOx bass radiator, improving the visceral 'impact' of the bass through the wOOx radiator's extreme air displacement capability. This use of active equalization to increase overall system output is the primary characteristic that differentiates wOOx technology from typical loudspeaker systems equipped with passive radiators.
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