The Vertus CLA 118SA is specifically designed to work with the 206 and 406 Vertus Column Line Array series. This Active 18A B&C high excursion woofer with 3A voice coil is driven by the built in 1200W RMS amplifier delivering 138 dB SPL.This great combination is in a 15mm Baltic birch plywood cabinet completely made in Italy . Key Features: Active subwoofer in bass-reflex design 460mm (18”) B&C high excursion woofer with 75mm (3”) voice coil Frequency response from 33Hz to 100Hz 1200W RMS Class D power amplifier with swittching mode power supply Processor DSP with 8 presets, cardioid configuration, delay Control Panel with XLR input and link, volume, presets, delay, phase 0 ° -180 °, ground-lift Neutrik powerCON True1 power IN and LINK connectors 15mm (5/8”) birch plywood with scratch-resistant coating Stackable M20 (20mm) top mount speaker stand socket, two diecast aluminium carrying handles with rubber inserts Optional 4 swivel-mount casters 80mm (3.15”) on request Suitable for low frequency extension and reinforcement of the CLA406A array, especially for live performance