1.5″ Full Range Speaker with no amplifier required The best speaker for new car With vibrating membrane No complicatred audio tuning required Easy setting Technician required to install Cone Type : Titanium Dome Voice Coil Diametre : 20mm Magnet Weight : Neodymium Impedance : 4Ω Sensitivity : 90 + 2db Frequency : 300Hz ~ 18kHz±3db Peak Power : 40 Watts