The QS 118A subwoofer is the ideal complement for QUBE models Q 112A and Q115A two way speaker systems to provide extended low frequency reinforcement down to 33Hz. Built-in HHD system: consisting of a 1000 w RMS Class D PWM amplifier along with digital processing. The 18” front facing dual coil woofer is housed in a compact bass reflex designed cabinet. The QS 118A when paired with the Q112A or Q115A creates a very powerful 3 - way system for FOH, stage side fills and other high performance touring and installation applications. The QS 118A’s compact cabinet dimensions provides for creating stacked subwoofer arrays while only occupying minimum stage or floor space. Easy to Transport thanks to the built in rear wheels, the QS 118A Sub features a 1⅜” (35mm) top mount speaker stand socket and six M -10 fly points. The cabinet is constructed with 18 mm. (3/4”) Baltic birch plywood that is also internally braced to prevent undesired resonance and is finished with a durable scratch and scuff resistant black paint.