The CORE 10218SP is a passive 18" sub-bass system specifically designed to be used with the CORE 10218SA active sub-bass cabinet but can be used in a fully passive setup with rack-mount amplifiers if required or preferred. The CORE 10218SP is compact, lightweight and can be flown or ground stacked and possesses high output capability with low frequency extension. It contains a single Ultra-long 18” / 4” V.C. woofer is front loaded and the rear of the low frequency driver is reflex loaded to extend the Low frequency output to below the natural cut off point. The proprietary rigging system of the CORE10218SP is directly compatible with the CORE 102A, CORE 102P ad CORE 10218SA.