For extra low-frequency extension and enhancement, the dual 12 inch powered KSub is perfectly matched to the rest of the K Series. The K8, K10 and K12 all have a selectable high-pass filter for use with the subwoofer. The KSub includes a fixed low-pass filter so it will accept full-range input. Constructed of premium birch, the QSC KSub includes high-quality, low-noise casters and a threaded pole receptacle for a positive, wobble free connection to a threaded speaker pole (included). QSC KSub Powered Dual 12 Inch Subwoofer Features 1000 watt Class D power module Dual balanced female XLR / 1/4 inch line level input Dual Balanced male XLR full range line level out Attractive and professional appearance Rugged ABS enclosures Tour-grade 18 gauge steel grilles Ergonomic handles with comfortable, non-slip grip Casters and pole mount (pole included) AmericanMusical is an authorized dealer of QSC products.