I'm looking for center chanel and surround speakers. Can anyone tell me , please what the most important specification factors are to lok for in order to match the main speakers best. Is it sensivity, freequency, watts, ohms? My main speakers have aluminium cones. Do surround & center have to have aluminium cones too?
Main speakers : 100W, Peak 250W, Sensivity 90db, SPL 107 , 4-8 ohms, frequency32hz-20khz



I appreciate your answers