The JBL's CONTROL 50ST high-performance subwoofers designed for use in commercial and small venue installation situations. Each subwoofer cabinet has 8'' long-excursion driver with a high-mass cone and a 4-layer copper voice coil for improved low-frequency response and motor strength. The metal former has a good transient response, and the rubber half roll surround improves bass performance. This public address system has a continuous power handling capability of 150W. Each has a low impedance operation and a configurable 70/100V output for distributed lines. The subwoofers come with mounting brackets for mounting them to the wall.