The JBL Control SB-2 is a subwoofer specifically designed for use in professional applications like background music and sound reinforcement. It features a slot-load vented design and can handle up to 340 Watts of power. The unit is typically used in conjunction with JBL's Control contractor series of speakers, providing enhanced bass performance in a variety of settings. It also supports both high and low impedance connections, making it versatile for different installation needs.