Driver:Woofer 10″ + Tweeter 2.5″ + Tweeter 1″ Frequency Response: 35Hz-20,000Hz Sensitivity(1m,1W): 89dB Speaker Dimensions: 345x157mm(φxD) Material: Engineering-Plastic Impendance: 8 Ohms Transformer:30w-20w-10w-5w-8Ω(100V or 70V)