KS Audio CB 18, Aktiver 18" Bassreflex Subwoofer, With Built in Amplifier 1 x 1200 W for the Bass and 2 x 400W For the MAtching top cabinets KS C10, Output for a matching Slave Sub cabinet CW18, Built-in DSP with FIR Filter, Direct input on the Sub for a USB input to allow EQ changes and Limiter settings, M20 Stand flange, Dimensions 540 x 540 x 660 mm, Weight 39Kg