Focus speakers are serious products, engineered by Earthquake Sound to meet the demands of the toughest musical and environmental situations in the high-fidelity world. Speakers are not about Hype or the "one of a kind" Material... It's all about being able to thoroughly enjoy your music no matter what type It is. By applying our extensive testing and development resources, focus speakers have been optimized to reproduce your music with lifelike balance, effortless dynamics and smooth response in the car. Special attention has been placed on high frequency response and piston area which might makes all the difference when installed in a vehicle. Sold and priced per set. Specifications: mid-bass: 133mm/ 30mm voice coil tweeter: 25mm silk dome/ NEO magnet rec. Amp power: 500W Max frequency response: 35Hz - 22kHz (3dB) Sensitivity: 87dB @ 1W/1m nominal Impedance: 4-ohmfor more information please visit: www.Earthquakesound.Eu.