18\" Passive Subwoofer System JBL SRX818S is a single 18” subwoofer for concert, touring, or installed use. Featuring a standard M20 pole cup for use with top boxes, indexing feet for stacking in both the standard and cardioid position, and a 136dB max SPL, the SRX818S is an ideal solution for musicians, bands, and DJs, concert use, public speaking, or installations such as performance venues, corporate spaces, educational facilities or houses of worship. Tunings and presets are available for Crown ITech HD and XTI 2 amps as well as dbx VENU360 signal processors Features: Premium JBL Transducers Rugged, versatile enclosures Tunings available for Crown amps and dbx signal processors Fully supported in Audio Architect Power Handling: 2400W Peak, 1200W Program, 600W Continuous Frequency Range: 28Hz-150Hz Frequency Response: 45Hz-150Hz Max SPL: 135dB Amplification options: Passive 2279 LF 8 Ohm 18” Woofer