The Sub 18-800 ST is a high-powered subwoofer that features a 4 "special roll-up coil (In / Out) designed to operate in low frequency responses. It has a central and lateral ventilation system that allows excellent thermal dissipation. It uses special cellulose cone with fiber and mobile system of high complicity and resistance, allowing to withstand intense sound pressure, being especially indicated for use in sub-grave and grave boxes.