ESX Q168P Passive underseat subwoofer 200w 2ohm. 15 x 20 cm (6 x 8) subwoofer system. The very slim QUANTUM Q168P system is equipped with a 15 x 20 cm special woofer. The housing, made of sturdy cast aluminum, can be placed anywhere, be it under or behind the seat or in a storage compartment in the trunk. Thanks to the integrated input/output terminals, two Q168P systems can be connected using the included connection cable via plug+play. Input/Output terminal for connecting two Q168P. Quick Connect connection socket. Dimensions 195 x 74 x 260 mm.