The JBL Professional SRX828S - Dual-18" Passive Subwoofer System is designed for concert, touring, or installed applications. With indexed feet for stacking in both standard and cardioid positions, 4800W peak-power handling, and a maximum SPL of 141 dB, the subwoofer is suitable for musicians, bands, DJs, PA, performance venues, corporate spaces, houses of worship, and more. The wide stance of the subwoofer is suitable for splaying top boxes. A variety of tunings and presets is available for Crown ITech HD and XTI 2 amps as well as the dbx VENU360 signal processor.