The L-Acoustics SB218 is a high power, two-way dual 18" subwoofer designed for use with L-Acoustics K1, KUDO, V-DOSC, and ARCS series speakers. It provides exceptional low frequency response and can be flown or ground stacked. The L-Acoustics SB218, with a peak RMS of 1100 W and a response down to 25 Hz, is great for getting the most of your bass in large applications like outdoor concert festivals.