Nominal diameter 12", 305mm Power rating 100Wrms Nominal impedance Available 4Ω, 8Ω or 16Ω Sensitivity 97dB Chassis type Pressed steel Voice coil diameter 2", 50.8mm Voice coil material Round copper Magnet type Ceramic Magnet weight 35oz, 0.99kg Frequency range 80-5000Hz Resonance frequency, Fs86Hz DC resistance, Re Available 3.4Ω, 7.4Ω or 14.83Ω Mounting Information Cut-out diameter 11.1", 283mm Diameter 12.2", 309mm Magnet structure diameter 5.8", 148mm Mounting slot PCD 11.7", 297mm Number of mounting slots 4 Overall depth 4.9", 124mm