The SUB 8004-AS is one of the most powerful 18” subwoofers in the pro-sound category. Featuring a high-power, hypervented 18” woofer with 4” inside/outside voice coils, this cabinet is designed to deliver a serious amount of low frequency. Powered by a 1250W digital amplifier module, the SUB 8004-AS can perform in the most demanding situations. The input board includes volume control, deep/punch switch, high pass switch, phase switch, cardioid, and time delay.