Specifications: Nominal Diameter = 8" Nominal Impedance = 4 OHM RMS Power Handling = 400W Maximum Power Handling = 800W Sensitivity (1w/1m) = 95dB Frequency Response = 80Hz-11.3KHz Recommended HI Pass Crossover = 100 Hz Motor: Voice Coil Diameter = 2" / 50.8mm Voice Coil Former Material = GLASS FIBER Winding Material = CCAW Cone Material = NON-PRESSED PAPER Surround Material = CLOTH Basket Material = ALUMINUM Magnet Material = FERRITE Magnet Weight = 49 oz Displacement Volume = 0.059L Thiele & Small Parameters: Equivalent Volume = Vas = 7.77 LTR Excursion (one way) = Xmax = 9.2mm Free Air Resonance = Fs = 100.8 Hz Mechanical Factor = Qms = 4.887 Electrical Factor = Qes = 0.461 Total Factor = Qts = 0.421 CD Resistance = Re = 3.2 OHMS Measurement: Overall Diameter = 8.31" / 211mm Overall Depth = 4.02" / 102mm Front Mount Baffle Cutout = 5.7"/ 145mm Mounting Depth = 2.44" / 62mm Motor Diameter = 4.33" / 110mm