18-inch HE BWX low frequency speaker driver series represents a new level of power and performance for Black Widow loudspeakers. Power handling is increased by 40% over other comparable models, along with reduced distortion and higher overall sound quality. This series consists of four specially designed 18-inch drivers, suitable for high performance sound reinforcement and musical instrument applications. It works in moderately sized enclosures, and has extremely high efficiency. Vented and properly designed dual-reflex bandpass enclosure is suitable for this driver. It is also an excellent choice for keyboard / bass guitar / drum monitor applications.