KS Audio CB 18, Active 18"" bass reflex subwoofer, Built-in 1200 W amp for the subwoofer + 2x 400 W for the corresponding KS C10 top, Output for matching Slave Sub CW18, Built-in DSP with FIR filter, Direct USB connection to the subwoofer for EQ and limiter settings (presets can be stored), M20 flange, Dimensions: 540 x 540 x 660 mm, Weight: 37 kg