VOW12a-D4 Speaker Size12″ Watts RMS500-1500 Watts Peak3000 Voice Coil Diameter – in3 Voice Coil ImpedanceDual 4 Ohm Piston Diameter – in10.25 Fs – Hz39 Qms4.381 Qes0.439 Qts0.399 Vas – liters30.301 dBSPL88 Xmech – mm70 Xmax – mm8 Frame OD – in12.625 Frame OD w/Gasket – in12.75 Mounting Diameter – in11.125 (28,25cm) Mounting Depth – in6.75 (17.14cm) Motor Depth – in3 (7.62cm) Motor Diameter – in7.87 (19,98cm) Magnet Weight – oz160 (4,5kg) Woofer Displacement – ft30.12 Sealed Enclosure – cu ft1.5-2.5 (42-70l) Ported Enclosure – cu ft1.75-2.75 (49-78l) Note! The enclosure is designed for subwoofers with a cast-frame, and the mounting hole for the element is therefore 292mm. Note! If you install a subwoofer with a long xmax we recommend not installing the protective grill ( cone of the subwoofer could hit the grille ) Enclosure litres: 87 Size: W x H x D 773 x 410 x 510mm