Speaker Size (In): 12 Watts RMS: 1200 Impedance: D4 VCD (In): 3 Piston Diameter (MM): 247.7 Frequency Response (Hz): 35 – 2k Fs (Hz): 40.85 Qms: 5.807 Qes: 0.517 Qts: 0.475 Vas (Liters): 17.57 BL (TM): 30 Xmech (MM): 30 Xmax (MM): 12 Frame OD w/Gasket (In): 12.625 Mounting Diameter (In): 11 3/8 Mounting Diameter (MM): 286 Mounting Depth (In): 5.125 Mounting Depth (MM): 130