DETAILS At the bottom the MX2 Series Coaxial Speaker sits a High Energy Y30 Magnets assures sufficient magnet force needed. In the center of a MX2 speaker sits a 0.5" High temperature KSV voice coil, laminated paper cones with Butyl Foam Surround. FEATURES: High-Energy Y30 Magnets Assures Sufficient Magnet Force Needed For High Sensitivity And Accurate Sound Reproduction Rugged Construction To Withstand Harsh Mobile Environment Custom Laminated Paper Cone With Butyl Foam Surround High Quality Cloth Spider With Polyester Fiber 0.5" High Temperature KSV Voice Coil SPECIFICATIONS: Speaker Size 2" Impedance 4 Ohm Frequency Range 200-20KHz Sensitivity 90.1dB RMS Power 20 watts Max Power 40 watts Peak Power 100 watts Mounting Depth 1.12" Mounting Diameter 1.81" Frame Diameter 2.87" x 2.0" Tweeter Size N/A