The black KLA181 1,000-Watt Subwoofer from QSC is designed to be used in the KLA series fixed line array system. It can reproduce frequencies down to 33Hz and produces up to 1,000-watts of output. The KLA181 has an integrated threaded pole-cup receptacle that allows you to pole-mount up to 2 KLA12 speakers on top of it for array setup. Its M10 fittings allow it to alternatively be suspension mounted.