4" Two-Way Speaker System Specifications RMS Power Handling: 30 Watts per Speaker PEAK Power Handling: 75 Watts per Speaker // 150 Watts per System Frequency Response: 100Hz - 20 kHz Sencitivity:87dB @ 1w/1m System Impedance: 4 Ohm Mounting Depth: 1.69" Features 4" Two-Way Speaker System Black Polypropylene Mica Cone Treated Cloth Surround 1"High Temperature Aluminum Voice Coil 1/2" Polymer Neodymium Dome Midrange Includes Custom Molded Grills