HK Audio SONAR-112-XI Active PA Speaker - 12"The SONAR Xi models are fullrange speakers designed for use as a stand alone speaker, in front PAs, as stage monitors and as very powerful mid high units in subwoofer and satellite systems. Their elegant yet robust polymer enclosures are tough enough to withstand years of hard wear on the road. A steel grille with acoustic foam backing protects the loudspeakers from knocks, dust and splashed water. The speaker stand mounts ingeniously simple design