DAS ACTION-S218A - Active Dual 18-Inch Subwoofer (Black)ACTION S218A is a high power active subwoofer system that incorporates a 3200 Wpeak amplifier and two 18FW4 speakers with a 3 coil and 20 mm winding depth, double layer and sandwich to boost system power, as well as a new forced convection circuit that works to reduce the effects of coil heating. As part of their company culture, all DAS systems are developed under a single philosophy: to deliver the highest possible quality in terms of both materials