Axiom SW18P Direct Radiating Subwoofer - 18”The SW18P is a compact and powerful subwoofer that provides extended low frequency response for specific models in the ED series of high performance point source loudspeakers, and designed for use in live music venues, nightclubs, bars, houses of worship, and for corporate and AV applications. The 18 low frequency driver is equipped with a high power 18 (460mm) transducer capable of long excursion (up to 30mm peak to peak), controlled by a high