FOUR Audio 4-KC525

2-Way separate system with shallow installation depth. Designed to give good bass response in door installation. 5.25″ separate system 2-way RMS Power handling: 60W Peak Power handling: 120W Frequency response: 60Hz - 20kHz Sensitivity: 90dB/W/m Impedance: 4Ω Mounting depth: 38mm Crossover with tweeter level adjustment Powerful mid range speakers 20mm silk dome tweeters Molded IMPP cone to improve bass response Universal Flat Design basket.