The SUB18 is a high-output, 18" studio subwoofer from JBL that can be used for applications where high, continuous output and very low frequency response are required. With in-room response below 18 Hz and with a 137 dB peak output, the SUB18 is suitable for demanding dance music production as well as cinema post production applications. When used with JBL's M2 Master Reference Monitor system (available separately), the SUB18 allows three times greater output from the M2 system. Specifications In-room response (2π) Below 18 Hz Frequency Response, -10 dB (4π measurement) 20.6 Hz Frequency Response, -6 dB (4π measurement) 23.1 Hz Maximum Peak SPL 137 dB SPL System Input Power Rating, AES/2 Hr.: LF 2000W continuous/8000W peak Sensitivity 92dB @ 1m, 2.83 V Amplifier Power Rating 3,500 to 4,000W into 8Ω Recommended Signal Processing Crown iTech HD Power Amplification. Preset for use with JBL M2 available LF Driver One JBL model 2269H, 18-inch (457 mm); 100mm (4-inch) dual voice coils, dual neodymium magnets. Differential Drive® Direct Cooled™ Rated Impedance 8Ω Enclosure 18mm 11-ply Baltic Birch Plywood Finish Black Lacquer Input Connectors 2 ea. Push Terminals Recommended Wire 12-Gauge Dimensions HxWxD (including feet) 27 x 30 x 24 inches (685 x 762 x 620 mm) Net Weight (each) 100 lbs ( 45 kg) Frequency Response (±3 dB) 18 Hz @ 2π