The QA118Sa is matching active subwoofer for QA108a two way line array cabinets bringing additional low frequency SPL to any sound system. Compact, high power subwoofer system loaded with B&C custom made 18 -inch woofer and 4-inch voice coil in bass reflex design, QA118Sa is powered by an internal 1200W Class D power amplifier with switch mode power supply. With an extended frequency response that goes down to 33Hz, the subwoofer delivers 132dB SPL. DSP controller provides six different equalization presets and six different delay settings. QA118a cabinet is constructed with 18mm (3/4-inch) Baltic birch plywood and finished with scratch and scuff resistant black paint. Ergonomically placed integrated handles also make for easy handling, lifting and transportation.