Features: 1.Universal Fit: The durable and innovative design blends high volume speakers with high power drivers, suitable for all car audio systems. 2.500W High Power: This treble and bass coaxial car speaker system has 500W maximum peak power output, so you can play your favorite tracks as you like. 3.4 Ohm Impedance: With 90dB sensitivity and a 4 ohm impedance rating, the unit compensates for the undersized wires in many cars today. Distortion is reduced so you can enjoy crisp, clear sound. 4.Perfect Stereo Reproduction: With 40Hz?20KHz frequency response, it complements your current automotive midrange speaker housing system for omni directional stereo reproduction. 5.Fast Heat Dissipation: Voice coils can handle extreme heat and maintain their structural integrity, which means your speakers have a long lifespan. Advanced voice coil heat sink design for better heat dissipation. specification:Item Type: Coaxial Car Speaker Material: Magnet + Metal Iron Rated Power: 40W x 2 Maximum Power: 500W x 2 Impedance: 4 OHMS Sensitivity: 90dB Frequency Range: 60Hz-20KHz Application: For All Car Audio Systems PackageList:2 x Speaker 2 x Speaker Cover