3 Way Full Range Speakers Massive performance in a small package is the hallmark of the fusion cs speaker range. Industry-leading technology, combined with state of the art design ensures a “no compromise” speaker range that can be installed in most vehicle situations. Specifications: Mounting Depth 71.5mm (2-14/16”) Mounting Diameter 156mm (6-3/16”) X 222mm (8-24/32”) Peak Power (Watts) 310 Rated Power (Watts) 55 Frequency Response 28hz - 25khz Sensitivity (Db) 87 Cone Material Polypropylene Surround Material Rubber Basket Steel Frame Protection Boot No Tweeter Type Pei Crossover Type 1st Order Thiele Small Parameters: D.C Coil Resistance (Re) (Ohm) 3.3 Free Air Resonance (Fs) 57.489 Cone Area (SD) (Cm²) 209 Vas (L) 22.769 Vas (CUFT) 0.804 Compliance (CMS) (?m/n) 367 Diaphragm Mass (MMD) (Kg) 0.0191 Force Factor (BL) (Tm) 3.878 Mechanical Q (QMS) 2.13 Electrical Q (QES) 1.654 Total Loudspeaker Q (QTS) 0.931 Voice Coil Impedance 4 Ohm