The SUB 8005-AS is on of the most powerful 21” subwoofers in pro-sound category. Featuring a high power, hypervented 21” woofer, with 4.5” inside/outside voice coils, this cabinet is designed to deliver a serious amount of low frequency. Powered by a 2500W digital amplifier module, the SUB 8005-AS can perform in the most demanding situations. The input board includes volume control, deep/punch switch, high pass switch, phase switch, cardioid, time delay.