Speaker Size (In): 8 Watts RMS: 400 Impedance: S4 Frequency Response (Hz): 60 – 8k Fs (Hz): 60 Qms: 2.169 Qes: 0.645 Qts: 0.497 Vas (Liters): 25.59 dBSPL: 95 Xmax (MM): 8 Suspension Travel (MM): 30 Mounting Diameter (In): 7 3/8 Mounting Diameter (MM): 187.3 Mounting Depth (In): 3.75 Mounting Depth (MM): 96