RS 65M 500 Watts Max Power Handling 1.5" Voice Coil 94 dB Sensitivity 135HZ-13KHz of frequency response GENERAL SPECIFICATIONS Nominal Diameter 6.5” (165.1mm) Max Power Handling 500 w RMS Power Handling 250 w Frequency Response 135Hz-13KHZ Nominal Impedance 4ohm Sensitivity 94 dB Magnet Ferrite Voice Coil Diameter 1.5" Voice Coil Wire CCAW THIELE-SMALL PARAMETERS Equivalent Volume Vas 3.06 L Free Air Resonance Fs 137 Hz Mechanical Factor Qms 5.18 Electrical Factor Qes 0.93 Total Factor Qts 0.79 Cone Area Sd 128.6cm² Mechanical Mass Mms 9.64 g BI Factor BI 5.43 Tm Dc Resistance Re 3.2 Ohms MOUNTING INFO Overall Diameter 6.57”(167mm) Front Mount Baffle Cutout 5.64"(143mm) Mounting Depth 2.67"(68mm) Overall Depth 2.99"(76mm)